# Rock-paper-scissors

(Redirected from Rock Paper Scissors)
Rock-paper-scissors
You are encouraged to solve this task according to the task description, using any language you may know.

Implement the classic children's game Rock-paper-scissors, as well as a simple predictive   AI   (artificial intelligence)   player.

Rock Paper Scissors is a two player game.

Each player chooses one of rock, paper or scissors, without knowing the other player's choice.

The winner is decided by a set of rules:

•   Rock beats scissors
•   Scissors beat paper
•   Paper beats rock

If both players choose the same thing, there is no winner for that round.

For this task, the computer will be one of the players.

The operator will select Rock, Paper or Scissors and the computer will keep a record of the choice frequency, and use that information to make a weighted random choice in an attempt to defeat its opponent.

Extra credit

## 11l

Translation of: Python
```V rules = [‘rock’ = ‘paper’, ‘scissors’ = ‘rock’, ‘paper’ = ‘scissors’]
V previous = [‘rock’, ‘paper’, ‘scissors’]

L
V human = input("\nchoose your weapon: ")
V computer = rules[random:choice(previous)]

I human C (‘quit’, ‘exit’)
L.break

E I human C rules
previous.append(human)
print(‘the computer played ’computer, end' ‘; ’)

I rules[computer] == human
print(‘yay you win!’)
E I rules[human] == computer
print(‘the computer beat you... :(’)
E
print(‘it's a tie!’)

E
print(‘that's not a valid choice’)```
Output:
```
the computer played paper; the computer beat you... :(

the computer played scissors; yay you win!

the computer played paper; the computer beat you... :(

the computer played paper; the computer beat you... :(

the computer played rock; it's a tie!
```

```with Ada.Text_IO; with Ada.Numerics.Float_Random;

procedure Rock_Paper_Scissors is

Gen: Rand.Generator;

type Choice is (Rock, Paper, Scissors);

Cnt: array (Choice) of Natural := (1, 1, 1);
-- for the initialization: pretend that each of Rock, Paper,
-- and Scissors, has been played once by the human
-- else the first computer choice would be deterministic

function Computer_Choice return Choice is
Random_Number: Natural :=
Integer(Rand.Random(Gen)
* (Float(Cnt(Rock)) + Float(Cnt(Paper)) + Float(Cnt(Scissors))));
begin
if Random_Number < Cnt(Rock) then
-- guess the human will choose Rock
return Paper;
elsif Random_Number - Cnt(Rock) < Cnt(Paper) then
-- guess the human will choose Paper
return Scissors;
else -- guess the human will choose Scissors
return Rock;
end if;
end Computer_Choice;

Finish_The_Game: exception;

function Human_Choice return Choice is
Done: Boolean := False;
T: constant String
:= "enter ""r"" for Rock, ""p"" for Paper, or ""s"" for Scissors""!";
U: constant String
:= "or enter ""q"" to Quit the game";
Result: Choice;
begin
while not Done loop
Done := True;
declare
begin
if S="r" or S="R" then
Result := Rock;
elsif S="p" or S = "P" then
Result := Paper;
elsif S="s" or S="S" then
Result := Scissors;
elsif S="q" or S="Q" then
raise Finish_The_Game;
else
Done := False;
end if;
end;
end loop;
return Result;
end Human_Choice;

type Result is (Human_Wins, Draw, Computer_Wins);

function "<" (X, Y: Choice) return Boolean is
-- X < Y if X looses against Y
begin
case X is
when Rock => return  (Y = Paper);
when Paper => return (Y = Scissors);
when Scissors => return (Y = Rock);
end case;
end "<";

Score: array(Result) of Natural := (0, 0, 0);

C,H: Choice;

Res: Result;

begin
-- play the game
loop
C := Computer_Choice;  -- the computer makes its choice first
H := Human_Choice;     -- now ask the player for his/her choice
Cnt(H) := Cnt(H) + 1;  -- update the counts for the AI
if C < H then
Res := Human_Wins;
elsif H < C then
Res := Computer_Wins;
else
Res := Draw;
end if;
& "       RESULT: " & Result'Image(Res));
Score(Res) := Score(Res) + 1;
end loop;

exception
when Finish_The_Game =>
for R in Score'Range loop
end loop;
end Rock_Paper_Scissors;
```

First and last few lines of the output of a game, where the human did permanently choose Rock:

```./rock_paper_scissors
enter "r" for Rock, "p" for Paper, or "s" for Scissors"!
or enter "q" to Quit the game
r
COMPUTER'S CHOICE: SCISSORS       RESULT: HUMAN_WINS

enter "r" for Rock, "p" for Paper, or "s" for Scissors"!
or enter "q" to Quit the game
r
COMPUTER'S CHOICE: ROCK       RESULT: DRAW

enter "r" for Rock, "p" for Paper, or "s" for Scissors"!
or enter "q" to Quit the game
r
COMPUTER'S CHOICE: SCISSORS       RESULT: HUMAN_WINS

enter "r" for Rock, "p" for Paper, or "s" for Scissors"!
or enter "q" to Quit the game
r
COMPUTER'S CHOICE: ROCK       RESULT: DRAW

[...]

enter "r" for Rock, "p" for Paper, or "s" for Scissors"!
or enter "q" to Quit the game
r
COMPUTER'S CHOICE: ROCK       RESULT: DRAW

enter "r" for Rock, "p" for Paper, or "s" for Scissors"!
or enter "q" to Quit the game
r
COMPUTER'S CHOICE: PAPER       RESULT: COMPUTER_WINS

enter "r" for Rock, "p" for Paper, or "s" for Scissors"!
or enter "q" to Quit the game
q

HUMAN_WINS 2
DRAW 5
COMPUTER_WINS 21```

## Aime

```text
computer_play(record plays, record beats)
{
integer a, c, total;
text s;

total = plays["rock"] + plays["paper"] + plays["scissors"];
a = drand(total - 1);
for (s, c in plays) {
if (a < c) {
break;
}
a -= c;
}

beats[s];
}

integer
main(void)
{
integer computer, human;
record beats, plays;
file f;
text s;

computer = human = 0;

f.stdin;

beats["rock"] = "paper";
beats["paper"] = "scissors";
beats["scissors"] = "rock";

plays["rock"] = 1;
plays["paper"] = 1;
plays["scissors"] = 1;

while (1) {
if (f.line(s) == -1) {
break;
}

if (!plays.key(s)) {
o_text("Invalid choice, try again\n");
} else {
text c;

c = computer_play(plays, beats);

o_form("Human: ~, Computer: ~\n", s, c);

if (s == c) {
o_text("Draw\n");
} elif (c == beats[s]) {
computer += 1;
o_text("Computer wins\n");
} else {
human += 1;
o_text("Human wins\n");
}

plays.up(s);

o_form("Score: Human: ~, Computer: ~\n", human, computer);
}
}

return 0;
}```

## ALGOL 68

```BEGIN
# rock/paper/scissors game                                             #
# counts of the number of times the player has chosen each move        #
# we initialise each to 1 so that the total isn't zero when we are     #
# choosing the computer's first move (as in the Ada version)           #
INT    r count := 1;
INT    p count := 1;
INT    s count := 1;
# counts of how many games the player and computer have won            #
INT    player count   := 0;
INT    computer count := 0;
print( ( "rock/paper/scissors", newline, newline ) );
WHILE
CHAR player move;
# get the players move - r => rock, p => paper, s => scissors      #
#                        q => quit                                 #
WHILE
print( ( "Please enter your move (r/p/s) or q to quit: " ) );
read( ( player move, newline ) );
(   player move /= "r"
AND player move /= "p"
AND player move /= "s"
AND player move /= "q"
)
DO
print( ( "Unrecognised move", newline ) )
OD;
# continue playing until the player chooses quit                   #
player move /= "q"
DO
# decide the computer's move based on the player's history         #
CHAR  computer move;
INT   move count     = r count + p count + s count;
# predict player will play rock  if the random number              #
#     is in the range 0 .. rock / total                            #
# predict player will play paper if the random number              #
#     is in the range rock / total .. ( rock + paper ) / total     #
# predict player will play scissors otherwise                      #
REAL  r limit        = r count / move count;
REAL  p limit        = r limit + ( p count / move count );
REAL  random move    = next random;
IF    random move < r limit THEN
# we predict the player will choose rock - we choose paper     #
computer move := "p"
ELIF  random move < p limit THEN
# we predict the player will choose paper - we choose scissors #
computer move := "s"
ELSE
# we predict the player will choose scissors - we choose rock  #
computer move := "r"
FI;
print( ( "You chose: " + player   move, newline ) );
print( ( "I   chose: " + computer move, newline ) );
IF   player move = computer move THEN
# both players chose the same - draw                           #
print( ( "We draw", newline ) )
ELSE
# players chose different moves - there is a winner            #
IF ( player move = "r" AND computer move = "s" )
OR ( player move = "p" AND computer move = "r" )
OR ( player move = "s" AND computer move = "p" )
THEN
player count +:= 1;
print( ( "You win", newline ) )
ELSE
computer count +:= 1;
print( ( "I win",   newline ) )
FI;
print( ( "You won: "
, whole( player count  , 0 )
, ", I won: "
, whole( computer count, 0 )
, newline
)
)
FI;
IF   player move = "r" THEN
# player chose rock                                            #
r count +:= 1
ELIF player move = "p" THEN
# player chose paper                                           #
p count +:= 1
ELSE
# player chose scissors                                        #
s count +:= 1
FI
OD;
print( ( "Thanks for a most enjoyable game", newline ) )
END```

## AutoHotkey

```DllCall("AllocConsole")
Write("Welcome to Rock-Paper-Scissors`nMake a choice: ")

cR := cP := cS := 0 ; user choice count
Write("My choice: " . cpuChoice := MakeChoice(1, 1, 1))

Loop
{
Write(DecideWinner(userChoice, cpuChoice) . "`nMake A Choice: ")
cR += SubStr(userChoice, 1, 1) = "r", cP += InStr(userChoice, "P"), cS += InStr(userChoice, "S")
Write("My Choice: " . cpuChoice := MakeChoice(cR, cP, cS))
}

MakeChoice(cR, cP, cS){
; parameters are number of times user has chosen each item
total := cR + cP + cS

Random, rand, 0.0, 1.0
if (rand >= 0 and rand <= cR / total)
return "Paper"
else if (rand > cR / total and rand <= (cR + cP) / total)
return "Scissors"
else
return "Rock"
}

DecideWinner(user, cpu){
user := SubStr(user, 1, 1), cpu := SubStr(cpu, 1, 1)
if (user = cpu)
return "`nTie!"
else if (user = "r" and cpu = "s") or (user = "p" and cpu = "r") or (user = "s" and cpu = "p")
return "`nYou Win!"
else
return "`nI Win!"
}

return a
}
Write(txt){
FileAppend, % txt, CONOUT\$
}
```

## AutoIt

I´ve created a GUI to play and show results, no Console Input

```RPS()

Func RPS()
Local \$ai_Played_games
\$ai_Played_games = 3
For \$I = 1 To 3
\$ai_Played_games[\$I] = 1
Next
\$RPS = GUICreate("Rock Paper Scissors", 338, 108, 292, 248)
\$Rock = GUICtrlCreateButton("Rock", 8, 8, 113, 25, 131072)
\$Paper = GUICtrlCreateButton("Paper", 8, 40, 113, 25, 131072)
\$Scissors = GUICtrlCreateButton("Scissors", 8, 72, 113, 25, 131072)
\$Label1 = GUICtrlCreateLabel("W:", 136, 8, 18, 17)
\$Wins = GUICtrlCreateLabel("0", 160, 8, 36, 17)
\$Label3 = GUICtrlCreateLabel("L:", 208, 8, 13, 17)
\$Looses = GUICtrlCreateLabel("0", 224, 8, 36, 17)
\$Label5 = GUICtrlCreateLabel("D:", 272, 8, 15, 17)
\$Deuce = GUICtrlCreateLabel("0", 296, 8, 36, 17)
\$Displaybutton = GUICtrlCreateButton("", 136, 48, 193, 49, 131072)
GUICtrlSetState(\$ai_Played_games, 128)
GUISetState(@SW_SHOW)
While 1
\$nMsg = GUIGetMsg()
Switch \$nMsg
Case -3
Exit
Case \$Rock
\$Ret = _RPS_Eval(1, \$ai_Played_games)
GUICtrlSetData(\$Displaybutton, \$Ret)
If \$Ret = "Deuce" Then
Elseif \$Ret = "You Loose" Then
Elseif \$Ret = "You Win" Then
EndIf
Case \$Paper
\$Ret = _RPS_Eval(2, \$ai_Played_games)
GUICtrlSetData(\$Displaybutton, \$Ret)
If \$Ret = "Deuce" Then
Elseif \$Ret = "You Loose" Then
Elseif \$Ret = "You Win" Then
EndIf
Case \$Scissors
\$Ret = _RPS_Eval(3, \$ai_Played_games)
GUICtrlSetData(\$Displaybutton, \$Ret)
If \$Ret = "Deuce" Then
Elseif \$Ret = "You Loose" Then
Elseif \$Ret = "You Win" Then
EndIf
EndSwitch
WEnd

EndFunc   ;==>RPS

Func _RPS_Eval(\$i_Player_Choose, \$ai_Played_games)
Local \$i_choice = 1
\$i_rnd = Random(1, 1000, 1)
\$i_choose_1 = (\$ai_Played_games / \$ai_Played_games * 1000)
\$i_choose_2 = (\$ai_Played_games / \$ai_Played_games * 1000)
\$i_choose_3 = (\$ai_Played_games / \$ai_Played_games * 1000)
If \$i_rnd < \$i_choose_1 Then
\$i_choice = 2
ElseIf \$i_rnd < \$i_choose_1 + \$i_choose_2 And \$i_rnd > \$i_choose_1 Then
\$i_choice = 3
ElseIf \$i_rnd < \$i_choose_1 + \$i_choose_2 + \$i_choose_3 And \$i_rnd > \$i_choose_1 + \$i_choose_2 Then
\$i_choice = 1
EndIf
\$ai_Played_games += 1
If \$i_Player_Choose = 1 Then
\$ai_Played_games += 1
If \$i_choice = 1 Then Return "Deuce"
If \$i_choice = 2 Then Return "You Loose"
If \$i_choice = 3 Then Return "You Win"
ElseIf \$i_Player_Choose = 2 Then
\$ai_Played_games += 1
If \$i_choice = 2 Then Return "Deuce"
If \$i_choice = 3 Then Return "You Loose"
If \$i_choice = 1 Then Return "You Win"
ElseIf \$i_Player_Choose = 3 Then
\$ai_Played_games += 1
If \$i_choice = 3 Then Return "Deuce"
If \$i_choice = 1 Then Return "You Loose"
If \$i_choice = 2 Then Return "You Win"
EndIf
EndFunc   ;==>_RPS_Eval
```

## Bash

```#!/bin/bash
echo "What will you choose? [rock/paper/scissors]"
aiThought=\$(echo \$[ 1 + \$[ RANDOM % 3  ]])
case \$aiThought in
1) 	 aiResponse="rock"   ;;
2) 	 aiResponse="paper" ;;
3)  	 aiResponse="scissors"  ;;
esac
echo "AI - \$aiResponse"
responses="\$response\$aiResponse"
case \$responses in
rockrock)  isTie=1  ;;
rockpaper)  playerWon=0  ;;
rockscissors)  playerWon=1  ;;
paperrock)  playerWon=1  ;;
paperpaper)  isTie=1  ;;
paperscissors)  playerWon=0  ;;
scissorsrock)  playerWon=0  ;;
scissorspaper)  playerWon=1  ;;
esac
if [[ \$isTie == 1 ]] ; then echo "It's a tie!" && exit 1 ; fi
if [[ \$playerWon == 0 ]] ; then echo "Sorry, \$aiResponse beats \$response , try again.." && exit 1 ; fi
if [[ \$playerWon == 1 ]] ; then echo "Good job, \$response beats \$aiResponse!" && exit 1 ; fi
```

## BASIC

Works with: QBasic
```DIM pPLchoice(1 TO 3) AS INTEGER, pCMchoice(1 TO 3) AS INTEGER
DIM choices(1 TO 3) AS STRING
DIM playerwins(1 TO 3) AS INTEGER
DIM playerchoice AS INTEGER, compchoice AS INTEGER
DIM playerwon AS INTEGER, compwon AS INTEGER, tie AS INTEGER
DIM tmp AS INTEGER

' Do it this way for QBasic; FreeBASIC supports direct array assignment.
DATA "rock", "paper", "scissors"
FOR tmp = 1 to 3
NEXT
DATA 3, 1, 2
FOR tmp = 1 to 3
NEXT

RANDOMIZE TIMER

DO
' Computer chooses first to ensure there's no "cheating".
compchoice = INT(RND * (pPLchoice(1) + pPLchoice(2) + pPLchoice(3) + 3))
SELECT CASE compchoice
CASE 0 to (pPLchoice(1))
' Player past choice: rock; choose paper.
compchoice = 2
CASE (pPLchoice(1) + 1) TO (pPLchoice(1) + pPLchoice(2) + 1)
' Player past choice: paper; choose scissors.
compchoice = 3
CASE (pPLchoice(1) + pPLchoice(2) + 2) TO (pPLchoice(1) + pPLchoice(2) + pPLchoice(3) + 2)
' Player past choice: scissors; choose rock.
compchoice = 1
END SELECT

PRINT "Rock, paper, or scissors ";
DO
PRINT "[1 = rock, 2 = paper, 3 = scissors, 0 to quit]";
INPUT playerchoice
LOOP WHILE (playerchoice < 0) OR (playerchoice > 3)

IF 0 = playerchoice THEN EXIT DO

pCMchoice(compchoice) = pCMchoice(compchoice) + 1
pPLchoice(playerchoice) = pPLchoice(playerchoice) + 1
PRINT "You chose "; choices(playerchoice); " and I chose "; choices(compchoice); ". ";
IF (playerchoice) = compchoice THEN
PRINT "Tie!"
tie = tie + 1
ELSEIF (compchoice) = playerwins(playerchoice) THEN
PRINT "You won!"
playerwon = playerwon + 1
ELSE
PRINT "I won!"
compwon = compwon + 1
END IF
LOOP

PRINT "Some useless statistics:"
PRINT "You won "; STR\$(playerwon); " times, and I won "; STR\$(compwon); " times; "; STR\$(tie); " ties."
PRINT             ,   choices(1),   choices(2),   choices(3)
PRINT "You chose:", pPLchoice(1), pPLchoice(2), pPLchoice(3)
PRINT "  I chose:", pCMchoice(1), pCMchoice(2), pCMchoice(3)
```

A sample game:

```\$ ./rokpprscr
Rock, paper, or scissors [1 = rock, 2 = paper, 3 = scissors, 0 to quit]? 1
You chose rock and I chose paper. I won!
Rock, paper, or scissors [1 = rock, 2 = paper, 3 = scissors, 0 to quit]? 1
You chose rock and I chose scissors. You won!

[... 56 more times choosing "rock"...]

Rock, paper, or scissors [1 = rock, 2 = paper, 3 = scissors, 0 to quit]? 1
You chose rock and I chose paper. I won!
Rock, paper, or scissors [1 = rock, 2 = paper, 3 = scissors, 0 to quit]? 1
You chose rock and I chose paper. I won!
Rock, paper, or scissors [1 = rock, 2 = paper, 3 = scissors, 0 to quit]? 3
You chose scissors and I chose paper. You won!
Rock, paper, or scissors [1 = rock, 2 = paper, 3 = scissors, 0 to quit]?
Some useless statistics:
You won  5 times, and I won  54 times;  2 ties.
rock          paper         scissors
You chose:     60            0             1
I chose:     2             55            4
```

## Batch File

```@echo off
setlocal enabledelayedexpansion

set choice1=rock
set choice2=paper
set choice3=scissors
set freq1=0
set freq2=0
set freq3=0
set games=0
set won=0
set lost=0
set tie=0

:start
cls
echo Games - %games% : Won - %won% : Lost - %lost% : Ties - %tie%
choice /c RPS /n /m "[R]ock, [P]aper or [S]cissors? "

set choice=%errorlevel%
rem used [1,1000] as interval for random
if %games% equ 0 (
rem at the beginning, there's no bias for each choice
set /a "rocklimit=1000 / 3"
set /a "scissorslimit=1000 * 2 / 3"
) else (
set /a "rocklimit=1000 * %freq3% / %games%"
set /a "scissorslimit=1000 * (%freq1% + %freq3%) / %games%"
)
set /a "randchoice=%random% %% 1000 + 1"
set compchoice=2
if %randchoice% geq %scissorslimit% set compchoice=3
if %randchoice% leq %rocklimit% set compchoice=1

cls
echo Player: !choice%choice%! ^|vs^| Computer: !choice%compchoice%!
goto %compchoice%

:1
if %choice%==1 goto tie
if %choice%==2 goto win
if %choice%==3 goto loss

:2
if %choice%==1 goto loss
if %choice%==2 goto tie
if %choice%==3 goto win

:3
if %choice%==1 goto win
if %choice%==2 goto loss
if %choice%==3 goto tie

:win
set /a "won+=1"
echo Player wins^!
goto end

:loss
set /a "lost+=1"
echo Computer Wins^!
goto end

:tie
set /a "tie+=1"
echo Tie^!
goto end

:end
set /a "games+=1"
set /a "freq%choice%+=1"
pause
goto start
```

## BBC BASIC

```PRINT"Welcome to the game of rock-paper-scissors"
PRINT "Each player guesses one of these three, and reveals it at the same time."
PRINT "Rock blunts scissors, which cut paper, which wraps stone."
PRINT "If both players choose the same, it is a draw!"
PRINT "When you've had enough, choose Q."
DIM rps%(2),g\$(3)
g\$()="rock","paper","scissors"
total%=0
draw%=0
pwin%=0
cwin%=0
c%=RND(3)
PRINT"What is your move (press R, P, or S)?"
REPEAT
REPEAT q\$=GET\$ UNTIL INSTR("RPSrpsQq",q\$)>0
g%=(INSTR("RrPpSsQq",q\$)-1) DIV 2
IF g%>2 THEN PROCsummarise:END
total%+=1
rps%(g%)+=1
PRINT"You chose ";g\$(g%);" and I chose ";g\$(c%);
CASE g%-c% OF
WHEN 0:
PRINT ". It's a draw"
draw%+=1
WHEN 1,-2:
PRINT ". You win!"
pwin%+=1
WHEN -1,2:
PRINT ". I win!"
cwin%+=1
ENDCASE
c%=FNmove(rps%(),total%)
UNTIL FALSE
END
:
DEFPROCsummarise
PRINT "You won ";pwin%;", and I won ";cwin%;". There were ";draw%;" draws"
PRINT "Thanks for playing!"
ENDPROC
:
DEFFNmove(p%(),t%)
LOCAL r%
r%=RND(total%)
IF r%<=p%(0) THEN =1
IF r%<=p%(0)+p%(1) THEN =2
=0
```

Sample output:

```Welcome to the game of rock-paper-scissors
Each player guesses one of these three, and reveals it at the same time.
Rock blunts scissors, which cut paper, which wraps stone.
If both players choose the same, it is a draw!
When you've had enough, choose Q.
What is your move (press R, P, or S)?
You chose rock and I chose paper. I win!
You chose scissors and I chose paper. You win!
You chose scissors and I chose paper. You win!
You chose scissors and I chose paper. You win!
You chose scissors and I chose paper. You win!
You chose scissors and I chose rock. I win!
You chose paper and I chose paper. It's a draw
You chose paper and I chose rock. You win!
You chose paper and I chose rock. You win!
You chose paper and I chose paper. It's a draw
You chose paper and I chose paper. It's a draw
You chose paper and I chose rock. You win!
You chose scissors and I chose rock. I win!
You chose scissors and I chose scissors. It's a draw
You chose scissors and I chose rock. I win!
You chose scissors and I chose scissors. It's a draw
You chose scissors and I chose rock. I win!
You won 7, and I won 5. There were 5 draws
Thanks for playing!```

## C

```#include <stdio.h>
#include <stdlib.h>
#define LEN 3

/* pick a random index from 0 to n-1, according to probablities listed
in p[] which is assumed to have a sum of 1. The values in the probablity
list matters up to the point where the sum goes over 1 */
int rand_idx(double *p, int n)
{
double s = rand() / (RAND_MAX + 1.0);
int i;
for (i = 0; i < n - 1 && (s -= p[i]) >= 0; i++);
return i;
}

int main()
{
int user_action, my_action;
int user_rec[] = {0, 0, 0};
const char *names[] = { "Rock", "Paper", "Scissors" };
char str;
const char *winner[] = { "We tied.", "Meself winned.", "You win." };
double  p[LEN] = { 1./3, 1./3, 1./3 };

while (1) {
my_action = rand_idx(p,LEN);

"  1. Rock\n  2. Paper\n  3. Scissors\n> ");

/* scanf is a terrible way to do input.  should use stty and keystrokes */
if (!scanf("%d", &user_action)) {
scanf("%1s", str);
if (*str == 'q') {
printf("Your choices [rock : %d , paper :  %d , scissors %d] ",user_rec,user_rec, user_rec);
return 0;
}
continue;
}
user_action --;
if (user_action > 2 || user_action < 0) {
printf("invalid choice; again\n");
continue;
}
printf("You chose %s; I chose %s. %s\n",
names[user_action], names[my_action],
winner[(my_action - user_action + 3) % 3]);

user_rec[user_action]++;
}
}
```

Here's another code: (Does it using a while loop)

```#include <stdio.h> // Standard IO
#include <stdlib.h> // other stuff
#include <time.h>
#include <string.h>

//This should add weighted random function to "The Elite Noob"'s code, stolen from above code because it does calculation so well
//closest I could make it to original but without pointless attempt to make code look smaller than above code by putting code on the same lines

int rand_i(int n)
{
int rand_max = RAND_MAX - (RAND_MAX % n);
int ret;
while ((ret = rand()) >= rand_max);
return ret/(rand_max / n);
}

int weighed_rand(int *tbl, int len)
{
int i, sum, r;
for (i = 0, sum = 0; i < len; sum += tbl[i++]);
if (!sum) return rand_i(len);

r = rand_i(sum) + 1;
for (i = 0; i < len && (r -= tbl[i]) > 0; i++);
return i;
}

int main(int argc, const char *argv[])
{
char umove, cmove, line;
int user, comp;
int tbl[]={0,0,0};
int tbllen=3;
printf("Hello, Welcome to rock-paper-scissors\nBy The Elite Noob\n");
mainloop:
while(1)
{ // infinite loop :)
printf("\n\nPlease type in 1 for Rock, 2 For Paper, 3 for Scissors, 4 to quit\n");
srand(time(NULL));
comp = (weighed_rand(tbl, tbllen) + 1) % 3;
fgets(line, sizeof(line), stdin);
while(sscanf(line, "%d", &user) != 1) //1 match of defined specifier on input line
{
printf("You have not entered an integer.\n");
fgets(line, sizeof(line), stdin);
}
if( (user > 4) || (user < 1) )
{
continue;
}
switch (comp)
{
case 1 :
strcpy(cmove, "Rock");
break;
case 2 :
strcpy(cmove, "Paper");
break;
case 3 :
strcpy(cmove, "Scissors");
break;
default :
printf("Computer Error, set comp=1\n");
comp=1;
strcpy(cmove, "Rock");
break;
}
switch (user)
{
case 1 :
strcpy(umove, "Rock");
break;
case 2 :
strcpy(umove, "Paper");
break;
case 3 :
strcpy(umove, "Scissors");
break;
case 4 :
printf("Goodbye! Thanks for playing!\n");
return 0;
default :
printf("Error, user number not between 1-4 exiting...");
goto mainloop;
}
if( (user+1)%3 == comp )
{
printf("Comp Played: %s\nYou Played: %s\nSorry, You Lost!\n", cmove, umove);
}
else if(comp == user)
{
printf("Comp Played: %s\nYou Played: %s\nYou Tied :p\n", cmove, umove);
}
else
{
printf("Comp Played: %s\nYou Played: %s\nYay, You Won!\n", cmove, umove);
}
tbl[user-1]++;
}
}
```

## C#

```using System;
using System.Collections.Generic;
using System.Linq;

namespace RockPaperScissors
{
class Program
{
static void Main(string[] args)
{
// There is no limit on the amount of weapons supported by RPSGame. Matchups are calculated depending on the order.
var rps = new RPSGame("scissors", "paper", "rock", "lizard", "spock");

int wins = 0, losses = 0, draws = 0;

while (true)
{
Console.WriteLine("Make your move: " + string.Join(", ", rps.Weapons) + ", quit");

if (weapon == "quit")
break;

if (!rps.Weapons.Contains(weapon))
{
Console.WriteLine("Invalid weapon!");
continue;
}

int result = rps.Next(weapon);

Console.WriteLine("You chose {0} and your opponent chose {1}!", weapon, rps.LastAIWeapon);

switch (result)
{
case 1: Console.WriteLine("{0} pwns {1}. You're a winner!", weapon, rps.LastAIWeapon);
wins++;
break;
case 0: Console.WriteLine("Draw!");
draws++;
break;
case -1: Console.WriteLine("{0} pwns {1}. You're a loser!", rps.LastAIWeapon, weapon);
losses++;
break;
}

Console.WriteLine();
}

Console.WriteLine("\nPlayer Statistics\nWins: {0}\nLosses: {1}\nDraws: {2}", wins, losses, draws);
}

class RPSGame
{
public RPSGame(params string[] weapons)
{
Weapons = weapons;

// Creates a new AI opponent, and gives it the list of weapons.
_rpsAI = new RPSAI(weapons);
}

// Play next turn.
public int Next(string weapon)
{
string aiWeapon = _rpsAI.NextMove(); // Gets the AI opponent's next move.
LastAIWeapon = aiWeapon; // Saves the AI opponent's move in a property so the player can see it.

_rpsAI.AddPlayerMove(weapon); // Let the AI know which weapon the player chose, for future predictions.
return GetWinner(Weapons, weapon, aiWeapon); // Returns -1 if AI win, 0 if draw, and 1 if player win.
}

// Returns matchup winner.
public static int GetWinner(string[] weapons, string weapon1, string weapon2)
{
if (weapon1 == weapon2)
return 0; // If weapons are the same, return 0 for draw.

if (GetVictories(weapons, weapon1).Contains(weapon2))
return 1; // Returns 1 for weapon1 win.
else if (GetVictories(weapons, weapon2).Contains(weapon1))
return -1; // Returns -1 for weapon2 win.

throw new Exception("No winner found.");
}

/*
* Return weapons that the provided weapon beats.
* The are calculated in the following way:
* If the index of the weapon is even, then all even indices less than it,
* and all odd indices greater than it, are victories.
* One exception is if it is an odd index, and also the last index in the set,
* then the first index in the set is a victory.
*/
public static IEnumerable<string> GetVictories(string[] weapons, string weapon)
{
// Gets index of weapon.
int index = Array.IndexOf(weapons, weapon);

// If weapon is odd and the final index in the set, then return the first item in the set as a victory.
if (index % 2 != 0 && index == weapons.Length - 1)
yield return weapons;

for (int i = index - 2; i >= 0; i -= 2)
yield return weapons[i];

for (int i = index + 1; i < weapons.Length; i += 2)
yield return weapons[i];
}

public string LastAIWeapon
{
private set;
get;
}

private RPSAI _rpsAI;

class RPSAI
{
public RPSAI(params string[] weapons)
{
_weapons = weapons;
_weaponProbability = new Dictionary<string, int>();

// The AI sets the probability for each weapon to be chosen as 1.
foreach (string weapon in weapons)

_random = new Random();
}

// Increases probability of selecting each weapon that beats the provided move.
{
int index = Array.IndexOf(_weapons, weapon);

foreach (string winWeapon in _weapons.Except(GetVictories(_weapons, weapon)))
if (winWeapon != weapon)
_weaponProbability[winWeapon]++;
}

// Gets the AI's next move.
public string NextMove()
{
double r = _random.NextDouble();

double divisor = _weaponProbability.Values.Sum();

var weightedWeaponRanges = new Dictionary<double, string>();

double currentPos = 0.0;

// Maps probabilities to ranges between 0.0 and 1.0. Returns weighted random weapon.
foreach (var weapon in _weaponProbability)
{
double weightedRange = weapon.Value / divisor;
if (r <= currentPos + (weapon.Value / divisor))
return weapon.Key;
currentPos += weightedRange;
}

throw new Exception("Error calculating move.");
}

Random _random;
private Dictionary<string, int> _weaponProbability;
}
}
}
}```

Sample output of first 2 and last 2 rounds when player chooses rock every turn:

```Make your move: scissors, paper, rock, lizard, spock, quit
rock
You chose rock and your opponent chose lizard!
rock pwns lizard. You're a winner!

Make your move: scissors, paper, rock, lizard, spock, quit
rock
You chose rock and your opponent chose lizard!
rock pwns lizard. You're a winner!

...

Make your move: scissors, paper, rock, lizard, spock, quit
rock
You chose rock and your opponent chose paper!
paper pwns rock. You're a loser!

Make your move: scissors, paper, rock, lizard, spock, quit
rock
You chose rock and your opponent chose spock!
spock pwns rock. You're a loser!

Make your move: scissors, paper, rock, lizard, spock, quit
quit

Player Statistics
Wins: 5
Losses: 60
Draws: 1
```

## C++

```#include <windows.h>
#include <iostream>
#include <string>

//-------------------------------------------------------------------------------
using namespace std;

//-------------------------------------------------------------------------------
enum choices { ROCK, SPOCK, PAPER, LIZARD, SCISSORS, MX_C };
enum indexes { PLAYER, COMPUTER, DRAW };

//-------------------------------------------------------------------------------
class stats
{
public:
stats() : _draw( 0 )
{
ZeroMemory( _moves, sizeof( _moves ) );
ZeroMemory( _win, sizeof( _win ) );
}
void draw()		        { _draw++; }
void win( int p )	        { _win[p]++; }
void move( int p, int m )   { _moves[p][m]++; }
int getMove( int p, int m ) { return _moves[p][m]; }
string format( int a )
{
char t;
wsprintf( t, "%.3d", a );
string d( t );
return d;
}

void print()
{
string  d = format( _draw ),
pw = format( _win[PLAYER] ),		cw = format( _win[COMPUTER] ),
pr = format( _moves[PLAYER][ROCK] ),	cr = format( _moves[COMPUTER][ROCK] ),
pp = format( _moves[PLAYER][PAPER] ),	cp = format( _moves[COMPUTER][PAPER] ),
ps = format( _moves[PLAYER][SCISSORS] ), cs = format( _moves[COMPUTER][SCISSORS] ),
pl = format( _moves[PLAYER][LIZARD] ),	cl = format( _moves[COMPUTER][LIZARD] ),
pk = format( _moves[PLAYER][SPOCK] ),	ck = format( _moves[COMPUTER][SPOCK] );

system( "cls" );
cout << endl;
cout << "+----------+-------+--------+--------+---------+----------+--------+---------+" << endl;
cout << "|          |  WON  |  DRAW  |  ROCK  |  PAPER  | SCISSORS | LIZARD |  SPOCK  |" << endl;
cout << "+----------+-------+--------+--------+---------+----------+--------+---------+" << endl;
cout << "|  PLAYER  |  "  << pw << "  |        |   " << pr << "  |   " << pp << "   |   " << ps << "    |  " << pl << "   |   " << pk << "   |" << endl;
cout << "+----------+-------+   " << d << "  +--------+---------+----------+--------+---------+" << endl;
cout << "| COMPUTER |  "  << cw << "  |        |   " << cr << "  |   " << cp << "   |   " << cs << "    |  " << cl << "   |   " << ck << "   |" << endl;
cout << "+----------+-------+--------+--------+---------+----------+--------+---------+" << endl;
cout << endl << endl;

system( "pause" );

}

private:
int _moves[MX_C], _win, _draw;
};
//-------------------------------------------------------------------------------
class rps
{
private:
int makeMove()
{
int total = 0, r, s;
for( int i = 0; i < MX_C; total += statistics.getMove( PLAYER, i++ ) );
r = rand() % total;

for( int i = ROCK; i < SCISSORS; i++ )
{
s = statistics.getMove( PLAYER, i );
if( r < s ) return ( i + 1 );
r -= s;
}

return ROCK;
}

void printMove( int p, int m )
{
if( p == COMPUTER ) cout << "My move: ";
else cout << "Your move: ";

switch( m )
{
case ROCK: cout << "ROCK\n"; break;
case PAPER: cout << "PAPER\n"; break;
case SCISSORS: cout << "SCISSORS\n"; break;
case LIZARD: cout << "LIZARD\n"; break;
case SPOCK: cout << "SPOCK\n";
}
}

public:
rps()
{
checker[ROCK][ROCK] = 2; checker[ROCK][PAPER] = 1; checker[ROCK][SCISSORS] = 0; checker[ROCK][LIZARD] = 0; checker[ROCK][SPOCK] = 1;
checker[PAPER][ROCK] = 0; checker[PAPER][PAPER] = 2; checker[PAPER][SCISSORS] = 1; checker[PAPER][LIZARD] = 1; checker[PAPER][SPOCK] = 0;
checker[SCISSORS][ROCK] = 1; checker[SCISSORS][PAPER] = 0; checker[SCISSORS][SCISSORS] = 2; checker[SCISSORS][LIZARD] = 0; checker[SCISSORS][SPOCK] = 1;
checker[LIZARD][ROCK] = 1; checker[LIZARD][PAPER] = 0; checker[LIZARD][SCISSORS] = 1; checker[LIZARD][LIZARD] = 2; checker[LIZARD][SPOCK] = 0;
checker[SPOCK][ROCK] = 0; checker[SPOCK][PAPER] = 1; checker[SPOCK][SCISSORS] = 0; checker[SPOCK][LIZARD] = 1; checker[SPOCK][SPOCK] = 2;
}
void play()
{
int p, r, m;
while( true )
{
cout << "What is your move (1)ROCK (2)SPOCK (3)PAPER (4)LIZARD (5)SCISSORS (0)Quit ? ";
cin >> p;
if( !p || p < 0 ) break;
if( p > 0 && p < 6 )
{
p--;
cout << endl;
printMove( PLAYER, p );
statistics.move( PLAYER, p );

m = makeMove();
statistics.move( COMPUTER, m );
printMove( COMPUTER, m );

r = checker[p][m];
switch( r )
{
case DRAW:
cout << endl << "DRAW!" << endl << endl;
statistics.draw();
break;
case COMPUTER:
cout << endl << "I WIN!" << endl << endl;
statistics.win( COMPUTER );
break;
case PLAYER:
cout << endl << "YOU WIN!" << endl << endl;
statistics.win( PLAYER );

}
system( "pause" );
}
system( "cls" );
}
statistics.print();
}

private:
stats statistics;
int checker[MX_C][MX_C];
};
//-------------------------------------------------------------------------------
int main( int argc, char* argv[] )
{
srand( GetTickCount() );
rps game;
game.play();
return 0;
}
//-------------------------------------------------------------------------------
```

Sample output:

```What is your move (1)ROCK (2)SPOCK (3)PAPER (4)LIZARD (5)SCISSORS (0)Quit ? 1

My move: PAPER

I WIN!

What is your move (1)ROCK (2)SPOCK (3)PAPER (4)LIZARD (5)SCISSORS (0)Quit ? 3

My move: SPOCK

YOU WIN!

What is your move (1)ROCK (2)SPOCK (3)PAPER (4)LIZARD (5)SCISSORS (0)Quit ? 1

My move: LIZARD

I WIN!

[...]

+----------+-------+--------+--------+---------+----------+--------+---------+
|          |  WON  |  DRAW  |  ROCK  |  PAPER  | SCISSORS | LIZARD |  SPOCK  |
+----------+-------+--------+--------+---------+----------+--------+---------+
|  PLAYER  |  001  |        |   003  |   002   |   000    |  000   |   009   |
+----------+-------+   005  +--------+---------+----------+--------+---------+
| COMPUTER |  008  |        |   000  |   005   |   000    |  001   |   008   |
+----------+-------+--------+--------+---------+----------+--------+---------+

```

## Clojure

Library: jline

Note: If you run it with Leiningen, use the special trampoline run to prevent issues:

`\$ lein trampoline run`

Code:

```(ns rps.core
(:require [clojure.data.generators :refer [weighted]])
(:import jline.Terminal)
(:gen-class))

(def what-beats {:rock :paper, :paper :scissors, :scissors :rock})

(defn battle [human comp]
(let [h (name human)
c (name comp)]
(cond
(= human comp) (println (format "We both picked %s. DRAW!" c))
(= human (what-beats comp))
(println (format "Your %s defeats computer's %s. YOU WIN!" h c))
(= comp (what-beats human))
(println (format "Computer's %s defeats your %s. YOU LOSE!" c h))
:else (println (format "Wat? %s and %s ?" h c)))))

(defn key->rps [k]
(cond
(or (= k 82) (= k 114)) :rock
(or (= k 80) (= k 112)) :paper
(or (= k 83) (= k 115)) :scissors
:else nil))

(defn play-game [freqs]
(println "\n(R)ock, (P)aper, (S)cissors?")
(let [term (Terminal/getTerminal)
(if-not (nil? rps)
(do
(battle rps (what-beats (weighted freqs)))
(recur (assoc freqs rps (inc (rps freqs)))))
(println "Game Over Man!  Game Over!"))))

(defn -main
"Rock, Paper, Scissors!"
[& args]
(play-game {:rock 1, :paper 1, :scissors 1}))
```
Output:
```(R)ock, (P)aper, (S)cissors?
Your paper defeats computer's rock. YOU WIN!

(R)ock, (P)aper, (S)cissors?
Computer's paper defeats your rock. YOU LOSE!

(R)ock, (P)aper, (S)cissors?
We both picked scissors. DRAW!```

## Crystal

Inspired by #Ruby solution, but improved to allow additional weapons

```# conventional weapons
enum Choice
Rock
Paper
Scissors
end

BEATS = {
Choice::Rock     => [Choice::Paper],
Choice::Paper    => [Choice::Scissors],
Choice::Scissors => [Choice::Rock],
}

# uncomment to use additional weapons
# enum Choice
#   Rock
#   Paper
#   Scissors
#   Lizard
#   Spock
# end

# BEATS = {
#   Choice::Rock     => [Choice::Paper, Choice::Spock],
#   Choice::Paper    => [Choice::Scissors, Choice::Lizard],
#   Choice::Scissors => [Choice::Rock, Choice::Spock],
#   Choice::Lizard   => [Choice::Rock, Choice::Scissors],
#   Choice::Spock    => [Choice::Paper, Choice::Lizard],
# }

class RPSAI
@stats = {} of Choice => Int32

def initialize
Choice.values.each do |c|
@stats[c] = 1
end
end

def choose
v = rand(@stats.values.sum)
@stats.each do |choice, rate|
v -= rate
return choice if v < 0
end
raise ""
end

def train(selected)
BEATS[selected].each do |c|
@stats[c] += 1
end
end
end

enum GameResult
HumanWin
ComputerWin
Draw

def to_s
case self
when .draw?
"Draw"
when .human_win?
"You win!"
when .computer_win?
"I win!"
end
end
end

class RPSGame
@score = Hash(GameResult, Int32).new(0)
@ai = RPSAI.new

def check(player, computer)
return GameResult::ComputerWin if BEATS[player].includes? computer
return GameResult::HumanWin if BEATS[computer].includes? player
return GameResult::Draw
end

def round
puts ""
s = gets.not_nil!.strip.downcase
return false if "quit".starts_with? s
player_turn = Choice.values.find { |choice| choice.to_s.downcase.starts_with? s }
unless player_turn
puts "Invalid choice"
return true
end
ai_turn = @ai.choose
result = check(player_turn, ai_turn)
puts "H: #{player_turn}, C: #{ai_turn} => #{result}"
@score[result] += 1
puts "score: human=%d, computer=%d, draw=%d" % GameResult.values.map { |r| @score[r] }
@ai.train player_turn
true
end
end

game = RPSGame.new
loop do
break unless game.round
end
```

## D

Translation of: Python
```import std.stdio, std.random, std.string, std.conv, std.array, std.typecons;

enum Choice { rock, paper, scissors }

bool beats(in Choice c1, in Choice c2) pure nothrow @safe @nogc {
with (Choice) return (c1 == paper    && c2 == rock) ||
(c1 == scissors && c2 == paper) ||
(c1 == rock     && c2 == scissors);
}

Choice genMove(in int r, in int p, in int s) @safe /*@nogc*/ {
immutable x = uniform!"[]"(1, r + p + s);
if (x < s)      return Choice.rock;
if (x <= s + r) return Choice.paper;
else            return Choice.scissors;
}

Nullable!To maybeTo(To, From)(From x) pure nothrow @safe {
try {
return typeof(return)(x.to!To);
} catch (ConvException) {
return typeof(return)();
} catch (Exception e) {
static immutable err = new Error("std.conv.to failure");
throw err;
}
}

void main() /*@safe*/ {
int r = 1, p = 1, s = 1;

while (true) {
write("rock, paper or scissors? ");
if (hs.empty)
break;

immutable h = hs.maybeTo!Choice;
if (h.isNull) {
writeln("Wrong input: ", hs);
continue;
}

immutable c = genMove(r, p, s);
writeln("Player: ", h.get, " Computer: ", c);

if (beats(h, c)) writeln("Player wins\n");
else if (beats(c, h)) writeln("Player loses\n");
else                  writeln("Draw\n");

final switch (h.get) {
case Choice.rock:     r++; break;
case Choice.paper:    p++; break;
case Choice.scissors: s++; break;
}
}
}
```
Output:
```rock, paper or scissors? paper
Player: paper Computer: paper
Draw

rock, paper or scissors? scissors
Player: scissors Computer: scissors
Draw

rock, paper or scissors? rock
Player: rock Computer: paper
Player loses

rock, paper or scissors? rock
Player: rock Computer: paper
Player loses

rock, paper or scissors?
```

## Elixir

Translation of: Erlang
```defmodule Rock_paper_scissors do
def play, do: loop([1,1,1])

defp loop([r,p,s]=odds) do
IO.gets("What is your move? (R,P,S,Q) ") |> String.upcase |> String.first
|> case do
"Q" -> IO.puts "Good bye!"
human when human in ["R","P","S"] ->
computer = select_play(odds)
IO.puts "My move is #{play_to_string(computer)}"
case beats(human,computer) do
true  -> IO.puts "You win!"
false -> IO.puts "I win!"
_     -> IO.puts "Draw"
end
case human do
"R" -> loop([r+1,p,s])
"P" -> loop([r,p+1,s])
"S" -> loop([r,p,s+1])
end
_ ->
IO.puts "Invalid play"
loop(odds)
end
end

defp beats("R","S"), do: true
defp beats("P","R"), do: true
defp beats("S","P"), do: true
defp beats(x,x), do: :draw
defp beats(_,_), do: false

defp play_to_string("R"), do: "Rock"
defp play_to_string("P"), do: "Paper"
defp play_to_string("S"), do: "Scissors"

defp select_play([r,p,s]) do
n = :rand.uniform(r+p+s)
cond do
n <= r   -> "P"
n <= r+p -> "S"
true     -> "R"
end
end
end

Rock_paper_scissors.play
```

Sample output:

```What is your move? (R,P,S,Q) r
My move is Scissors
You win!
What is your move? (R,P,S,Q) p
My move is Paper
Draw
What is your move? (R,P,S,Q) s
My move is Scissors
Draw
What is your move? (R,P,S,Q) q
Good bye!
```

## Erlang

```-module(rps).
-compile(export_all).

play() ->
loop([1,1,1]).

loop([R,P,S]=Odds) ->
{ok,["Q"]} -> io:fwrite("Good bye!~n");
{ok,[[Human]]} when Human == \$R; Human == \$P; Human == \$S ->
[play_to_string(Human)]),
Computer = select_play(Odds),
io:fwrite("My move is ~s~n",
[play_to_string(Computer)]),
case {beats(Human,Computer),beats(Computer,Human)} of
{true,_} -> io:fwrite("You win!~n");
{_,true} -> io:fwrite("I win!~n");
_ -> io:fwrite("Draw~n")
end,
case Human of
\$R -> loop([R+1,P,S]);
\$P -> loop([R,P+1,S]);
\$S -> loop([R,P,S+1])
end;
_ ->
io:fwrite("Invalid play~n"),
loop(Odds)
end.

beats(\$R,\$S) -> true;
beats(\$P,\$R) -> true;
beats(\$S,\$P) -> true;
beats(_,_) -> false.

play_to_string(\$R) -> "Rock";
play_to_string(\$P) -> "Paper";
play_to_string(\$S) -> "Scissors".

select_play([R,P,S]) ->
N = random:uniform(R+P+S),
if
N =< R -> \$P;
N =< R+P -> \$S;
true -> \$R
end.
```

## Euphoria

Translation of: C
```function weighted_rand(sequence table)
integer sum,r
sum = 0
for i = 1 to length(table) do
sum += table[i]
end for

r = rand(sum)
for i = 1 to length(table)-1 do
r -= table[i]
if r <= 0 then
return i
end if
end for
return length(table)
end function

constant names = { "Rock", "Paper", "Scissors" }
constant winner = { "We tied.", "Meself winned.", "You win." }
integer user_action, my_action, key, win
sequence user_rec, score
user_rec = {1,1,1}
score = {0,0}

while 1 do
my_action = remainder(weighted_rand(user_rec)+1,3)+1
puts(1,"  1. Rock\n  2. Paper\n  3. Scissors\n> ")
key = -1
while (key < '1' or key > '3') and key != 'q' do
key = get_key()
end while
puts(1,key)
puts(1,'\n')
if key = 'q' then
exit
end if
user_action = key-'0'
win = remainder(my_action-user_action+3,3)
printf(1,"You chose %s; I chose %s. %s\n",
{ names[user_action],
names[my_action],
winner[win+1] })

if win then
score[win] += 1
end if
printf(1,"\nScore %d:%d\n",score)
user_rec[user_action] += 1
end while```

## F#

```open System

let random = Random ()
let rand = random.NextDouble () //Gets a random number in the range (0.0, 1.0)

/// Union of possible choices for a round of rock-paper-scissors
type Choice =
| Rock
| Paper
| Scissors

/// Gets the string representation of a Choice
let getString = function
| Rock -> "Rock"
| Paper -> "Paper"
| Scissors -> "Scissors"

/// Defines rules for winning and losing
let beats (a : Choice, b : Choice) =
match a, b with
| Rock, Scissors -> true    // Rock beats Scissors
| Paper, Rock -> true       // Paper beats Rock
| Scissors, Paper -> true   // Scissors beat Paper
| _, _ -> false

/// Generates the next move for the computer based on probability derived from previous player moves.
let genMove r p s =
let tot = r + p + s
let n = rand
if n <= s / tot then Rock
elif n <= (s + r) / tot then Paper
else Scissors

/// Gets the move chosen by the player
let rec getMove () =
printf "[R]ock, [P]aper, or [S]cissors?: "
match choice with
| "r" | "R" -> Rock
| "p" | "P" -> Paper
| "s" | "S" -> Scissors
| _ ->
printf "Invalid choice.\n\n"
getMove ()

/// Place where all the game logic takes place.
let rec game (r : float, p : float, s : float) =
let comp = genMove r p s
let player = getMove ()
Console.WriteLine ("Player: {0} vs Computer: {1}", getString player, getString comp)
Console.WriteLine (
if beats(player, comp) then "Player Wins!\n"
elif beats(comp, player) then "Computer Wins!\n"
else "Draw!\n"
)
let nextR = if player = Rock then r + 1.0 else r
let nextP = if player = Paper then p + 1.0 else p
let nextS = if player = Scissors then s + 1.0 else s
game (nextR, nextP, nextS)

game(1.0, 1.0, 1.0)
```

## Factor

```USING: combinators formatting io kernel math math.ranges qw
random sequences ;
IN: rosetta-code.rock-paper-scissors

CONSTANT: thing qw{ rock paper scissors }
CONSTANT: msg { "I win." "Tie!" "You win." }

: ai-choice ( r p s -- n )
3dup + + nip [1,b] random {
{ [ 3dup nip >= ] [ 3drop 1 ] }
{ [ 3dup [ + ] dip >= ] [ 3drop 2 ] }
[ 3drop 0 ]
} cond ;

: player-choice ( -- n )
"r/p/s/q? " write readln qw{ r p s q } index dup
[ drop player-choice ] unless ;

! return:
! -1 for n1 loses to n2.
!  0 for n1 ties n2.
!  1 for n1 beats n2.
: outcome ( n1 n2 -- n3 ) - dup abs 1 > [ neg ] when sgn ;

: status. ( seq -- )
"My wins: %d  Ties: %d  Your wins: %d\n" vprintf ;

: choices. ( n1 n2 -- )
[ thing nth ] bi@ "You chose: %s\nI chose: %s\n" printf ;

: tally ( seq n -- seq' ) over [ 1 + ] change-nth ;

: game ( seq -- seq' )
dup status. player-choice dup 3 = [ drop ] [
[ 3 + tally ] keep over 3 tail* first3 ai-choice 2dup
choices. outcome 1 + dup [ tally ] dip msg nth print nl
game
] if ;

! The game state is a sequence where the members are:
! losses, ties, wins, #rock, #paper, #scissors
: main ( -- ) { 0 0 0 1 1 1 } clone game drop ;

MAIN: main
```
Output:
```My wins: 0  Ties: 0  Your wins: 0
r/p/s/q? r
You chose: rock
I chose: paper
I win.

My wins: 1  Ties: 0  Your wins: 0
r/p/s/q? r
You chose: rock
I chose: scissors
You win.

My wins: 1  Ties: 0  Your wins: 1
r/p/s/q? r
You chose: rock
I chose: paper
I win.

My wins: 2  Ties: 0  Your wins: 1
r/p/s/q? r
You chose: rock
I chose: rock
Tie!

My wins: 2  Ties: 1  Your wins: 1
r/p/s/q? r
You chose: rock
I chose: rock
Tie!

My wins: 2  Ties: 2  Your wins: 1
r/p/s/q? r
You chose: rock
I chose: paper
I win.

My wins: 3  Ties: 2  Your wins: 1
r/p/s/q? r
You chose: rock
I chose: paper
I win.

My wins: 4  Ties: 2  Your wins: 1
r/p/s/q? q
```

## Forth

```include random.fs

0 value aiwins
0 value plwins

10 constant inlim
0  constant rock
1  constant paper
2  constant scissors

create rpshistory 0 , 0 , 0 ,
create inversemove 1 , 2 , 0 ,
3 constant historylen

: @a ( n array -- )
swap cells + @ ;

: sum-history ( -- n )
0 historylen 0 ?do
i rpshistory @a 1+ + loop ;

: probable-choice ( -- n ) \ Simple linear search
sum-history random
historylen 0 ?do
i rpshistory @a -
dup 0< if drop i leave then
loop inversemove @a ;

: rps-print ( addr u -- )
cr type ;

: rpslog. ( -- )
s"       ROCK    PAPER   SCISSORS  AI/W  PL/W" rps-print cr
3 0 do i cells rpshistory + @ 9 u.r  loop aiwins 7 u.r plwins 6 u.r cr ;

create rpswords ' rock , ' paper , ' scissors , ' quit ,

: update-history! ( n -- )
cells rpshistory + 1 swap +! ;

: thrown. ( n -- addr u )
cells rpswords + @ name>string ;

: throws. ( n n -- )
thrown. s" AI threw:  " 2swap s+ rps-print
thrown. s" You threw: " 2swap s+ rps-print ;

: print-throws ( n n -- )
rpslog. throws. ;

: tie. ( n n -- )
s" Tie. " rps-print ;

: plwin ( n n -- )
1 +to plwins s" You win. " rps-print ;

: aiwin ( n n -- )
1 +to aiwins s" AI wins. " rps-print ;

create rpsstates ' tie. , ' plwin , ' aiwin ,

: determine-winner ( n n -- )
>r abs r> abs - 3 + 3 mod
cells rpsstates + @  execute ;

: rps-validate ( name -- )  ( Rude way of checking for only valid commands )
4 0 do i cells rpswords + @ over = swap loop drop or or or ;

: rps-prompt. ( -- )
s" Enter choice (rock, paper, scissors or quit):   " rps-print ;

: player-choice ( -- n ) recursive
dup rps-validate if execute
else drop rps-prompt. player-choice then ;

: update-log ( n n -- )
update-history! update-history! ;

: rps ( -- ) recursive
rps-prompt. player-choice probable-choice
2dup update-log 2dup print-throws
determine-winner rps ;
```
```
Enter choice (rock, paper, scissors):   rock
rock
ROCK    PAPER   SCISSORS  AI/W  PL/W
34       12        8     12     8

AI threw:  rock
You threw: rock
Tie.

```

## Fortran

Please find an example run in a GNU/linux system along with compilation instructions at the beginning of the FORTRAN 2008 source code. Following the source are examples demonstrating the effectiveness of the built in simple predictive artificial intelligence. It uses the yes utility for a constant data source.

```! compilation
! gfortran -std=f2008 -Wall -ffree-form -fall-intrinsics -fimplicit-none f.f08 -o f
!
! EXAMPLE
!
!\$ ./f
!rock, paper, scissors?  papier
!scoring computer choice (r) and your choice (p)
!rock, paper, scissors?  sizzerz
!scoring computer choice (s) and your choice (s)
!rock, paper, scissors?  quit
!scoring computer choice (r) and your choice (q)
! Who's keeping score anyway???
!  0.5  1.5
! you won!
!\$

program rpsgame

integer, parameter :: COMPUTER=1, HAPLESSUSER=2
integer, dimension(3) :: rps = (/1,1,1/)
real, dimension(3) :: p
character :: answer, cc ! computer choice
integer :: exhaustion, i
real, dimension(2) :: score = (/0, 0/)
character(len=8), dimension(3) :: choices = (/'rock    ','paper   ','scissors'/)
real :: harvest
do exhaustion = 1, 30
p = rps/real(sum(rps))
p(2) = p(2) + p(1)
p(3) = p(3) + p(2)
call random_number(harvest)
i = sum(merge(1,0,harvest.le.p)) ! In memory of Ken Iverson, logical is more useful as integer.
cc = 'rsp'(i:i)
score = score + 0.5
else
i = HAPLESSUSER
if (cc.eq.'p') i = COMPUTER
if (cc.eq.'s') i = COMPUTER
if (cc.eq.'r') i = COMPUTER
else
exit
endif
score(i) = score(i) + 1
end if
rps(i) = rps(i) + 1
end do
if (25 .lt. exhaustion) write(6, *) "I'm bored out of my skull"
write(6, *)"Who's keeping score anyway???"
write(6, '(2f5.1)') score
if (score(COMPUTER) .lt. score(HAPLESSUSER)) print*,'you won!'
end program rpsgame
```

rpsgame won't play more than 30 games at a time.

```\$ yes r | ./f                                                         # rock
rock, paper, scissors?  scoring computer choice (r) and your choice (r)
rock, paper, scissors?  scoring computer choice (s) and your choice (r)
rock, paper, scissors?  scoring computer choice (r) and your choice (r)
...
rock, paper, scissors?  scoring computer choice (p) and your choice (r)
I'm bored out of my skull
Who's keeping score anyway???
25.5  4.5
yes: standard output: Broken pipe
yes: write error
\$ yes p 2>/dev/null | ./f                                             # paper
rock, paper, scissors?  scoring computer choice (r) and your choice (p)
rock, paper, scissors?  scoring computer choice (s) and your choice (p)
rock, paper, scissors?  scoring computer choice (r) and your choice (p)
rock, paper, scissors?  scoring computer choice (s) and your choice (p)
...
rock, paper, scissors?  scoring computer choice (s) and your choice (p)
I'm bored out of my skull
Who's keeping score anyway???
25.5  4.5
\$ yes scissors 2>/dev/null | ./f                                      # scissors
rock, paper, scissors?  scoring computer choice (r) and your choice (s)
rock, paper, scissors?  scoring computer choice (r) and your choice (s)
...
rock, paper, scissors?  scoring computer choice (r) and your choice (s)
I'm bored out of my skull
Who's keeping score anyway???
26.5  3.5
\$
```

## FreeBASIC

Translation of: Yabasic
```Dim Shared As Byte ganador = 1, accion = 2, perdedor = 3, wp, wc
Dim Shared As String word(10, 3)
For n As Byte = 0 To 9
Next n

Sub SimonSay(n As Byte)
Print Using "\       \  \        \  "; word(n, ganador); word(n, accion); word(n, perdedor)
End Sub

Sub Puntuacion()
Print !"\nPlayer = "; wp; !"\tComputer = "; wc; !"\n"
End Sub

Dim As Byte n
Dim As String*1 k
Dim As String eleccionCPU, eleccionJUG
Randomize Timer
Do
Cls

Print !"'Rock, Paper, Scissors, Lizard, Spock!' rules are:\n"
For n = 0 To 9
SimonSay(n)
Next n

Input !"(R)ock, (P)aper, (S)cissors, (L)izard, Spoc(K), (Q)uit  ", k

k = Ucase(k)
Select Case k
Case "Q"
Exit Do
Case "R"
eleccionJUG = "Rock"
Case "P"
eleccionJUG = "Paper"
Case "S"
eleccionJUG = "Scissors"
Case "L"
eleccionJUG = "Lizard"
Case "K"
eleccionJUG = "Spock"
End Select

Print !"\nPlayer chose "; eleccionJUG; " and Computer chose "; eleccionCPU
For n = 0 To 9
If word(n, ganador) = eleccionJUG And word(n, perdedor) = eleccionCPU Then
SimonSay(n)
Print !"\nWinner was Player"
wp += 1
Exit For
Elseif word(n, ganador) = eleccionCPU And word(n, perdedor) = eleccionJUG Then
SimonSay(n)
Print !"\nWinner was Computer"
wc += 1
Exit For
End If
Next n
If n = 10 Then Print !"\nOuch!"

Puntuacion()
Print "Press <SPACE> to continue"
Sleep
Loop Until(k = "Q")

Cls
Puntuacion()
If wp > wc Then
Print "Player win"
Elseif wc > wp Then
Print "Computer win"
Else
Print "Tie"
End If
Sleep
End

Data "Scissors","cuts","Paper"
Data "Paper","covers","Rock"
Data "Rock","crushes","Lizard"
Data "Lizard","poisons","Spock"
Data "Spock","smashes","Scissors"
Data "Scissors","decapites","Lizard"
Data "Lizard","eats","Paper"
Data "Paper","disproves","Spock"
Data "Spock","vaporizes","Rock"
Data "Rock","blunts","Scissors"
```

## GlovePIE

You can only press the R, P or S key to advance.

```if var.end=0 then
var.end=0
var.computerchoice=random(3) // 1 is rock, 2 is paper, and 3 is scissors.
debug="Press the R key for rock, the P key for paper, or the S key for scissors:"
endif
if pressed(Key.R)and var.end=0 then
var.end=1
if var.computerchoice=1 then
debug="You chose rock, which the computer also chose, so it's a tie!"
else
if var.computerchoice=2 then
debug="The computer chose paper, covering your choice of rock, so you lose!"
else
debug="You chose rock, smashing the computer's choice of scissors, so you win!"
endif
endif
endif
if pressed(Key.P)and var.end=0 then
var.end=1
if var.computerchoice=1 then
debug="You chose paper, covering the computer's choice of rock, so you win!"
else
if var.computerchoice=2 then
debug="You chose paper, which the computer also chose, so it's a tie!"
else
debug="The computer chose scissors, cutting your choice of paper, so you lose!"
endif
endif
endif
if pressed(Key.S)and var.end=0 then
var.end=1
if var.computerchoice=1 then
debug="The computer chose rock, smashing your choice of scissors, so you lose!"
else
if var.computerchoice=2 then
debug="You chose scissors, cutting the computer's choice of paper, so you win!"
else
debug="You chose scissors, which the computer also chose, so it's a tie!"
endif
endif
endif```

## Go

```package main

import (
"fmt"
"math/rand"
"strings"
"time"
)

const rps = "rps"

var msg = []string{
"Rock breaks scissors",
"Paper covers rock",
"Scissors cut paper",
}

func main() {
rand.Seed(time.Now().UnixNano())
fmt.Println("Rock Paper Scissors")
fmt.Println("Enter r, p, or s as your play.  Anything else ends the game.")
fmt.Println("Running score shown as <your wins>:<my wins>")
var pi string // player input
var aScore, pScore int
sl := 3               // for output alignment
pcf := make([]int, 3) // pcf = player choice frequency
var plays int
aChoice := rand.Intn(3) // ai choice for first play is completely random
for {
// get player choice
fmt.Print("Play: ")
_, err := fmt.Scanln(&pi)  // lazy
if err != nil || len(pi) != 1 {
break
}
pChoice := strings.Index(rps, pi)
if pChoice < 0 {
break
}
pcf[pChoice]++
plays++

// show result of play
fmt.Printf("My play:%s%c.  ", strings.Repeat(" ", sl-2), rps[aChoice])
switch (aChoice - pChoice + 3) % 3 {
case 0:
fmt.Println("Tie.")
case 1:
fmt.Printf("%s.  My point.\n", msg[aChoice])
aScore++
case 2:
pScore++
}

// show score
sl, _ = fmt.Printf("%d:%d  ", pScore, aScore)

// compute ai choice for next play
switch rn := rand.Intn(plays); {
case rn < pcf:
aChoice = 1
case rn < pcf+pcf:
aChoice = 2
default:
aChoice = 0
}
}
}
```
Sample output:
```Rock Paper Scissors
Enter r, p, or s as your play.  Anything else ends the game.
Running score shown as <your wins>:<my wins>
Play: r
My play: r.  Tie.
0:0  Play: p
My play:   p.  Tie.
0:0  Play: s
My play:   p.  Scissors cut paper.  Your point.
1:0  Play: r
My play:   p.  Paper covers rock.  My point.
1:1  Play: r
My play:   r.  Tie.
1:1  Play: r
My play:   p.  Paper covers rock.  My point.
1:2  Play:
```

```package main

import (
"flag"
"fmt"
"log"
"math/rand"
"regexp"
"strings"
"time"

"github.com/BurntSushi/toml"
)

var help = `rps plays rock-paper-scissors with optional addition weapons.

Usage: rps [-h] [game]
-h   display help.
game is a game description file in TOML (https://github.com/mojombo/toml).

The traditional game can be described as

title = "Rock Paper Scissors"
win = [
"rock breaks scissors",
"paper covers rock",
"scissors cut paper",
]

The title is optional, it just prints out at the beginning of a game.

The "win" list is statments where the first word wins over the last word.

It's case sensitive so make things easy by using consistent case.
Don't use punctuation, at least not next to a first or last word.

Additionally, you can have a "lose" key where the first word loses to the
the last, for example

lose = ["rock falls into well"]

To organize things with additional weapons, you can just use the winning
weapon with a list of clauses, for example

lizard = ["poisons Spock", "eats paper"]

The progam ignores anything in parentheses when identifying first or last
words.  Examples (from RPS-101) with weapons gun, fire, and sword,

win = [
"gun fire(s)"
"(flaming) sword has fire"
]

Finally, TOML is a hash, so don't duplicate keys.  That means no multiple
win or lose keys.  You must combine all the win statements and all the lose
statements.`

var rps = `
title = "Rock Paper Scissors"
win = [
"rock breaks scissors",
"paper covers rock",
"scissors cut paper",
]`

func main() {
h := flag.Bool("h", false, "show help")
flag.Parse()
if *h {
fmt.Println(help)
return
}
m := map[string]interface{}{}
var err error
switch flag.NArg() {
case 0:
_, err = toml.Decode(rps, &m)
case 1:
_, err = toml.DecodeFile(flag.Arg(0), &m)
default:
flag.Usage()
return
}
if err != nil {
log.Fatal(err)
}
play(parse(m))
}

type decision map[string]map[string]string

type fIndex map[string]int

func parse(m map[string]interface{}) (title string, f fIndex, d decision) {
d = decision{}
for k, v := range m {
switch t := v.(type) {
case []interface{}:
d.parseList(k, t)
case string:
if k == "title" {
title = t
} else {
log.Println("Unknown key:", k)
}
}
}
i := 0
f = fIndex{}
for w, wl := range d {
if _, ok := f[w]; !ok {
f[w] = i
i++
}
for l := range wl {
if _, ok := f[l]; !ok {
f[l] = i
i++
}
}
}
for fm := range f {
if _, ok := d[fm]; !ok {
log.Println("note,", fm, "always loses!")
}
}
balanced := len(f)&1 == 1
for _, l := range d {
if !balanced {
break
}
balanced = len(l)*2+1 == len(f)
}
if !balanced {
log.Print("note, game is unbalanced")
}
return title, f, d
}

var r = regexp.MustCompile(`[(].*[)]`)

func (d decision) parseList(kw string, l []interface{}) {
var ww string
for _, e := range l {
st, ok := e.(string)
if !ok {
log.Fatal("invalid", e)
}
w := strings.Fields(r.ReplaceAllLiteralString(st, ""))
if len(w) == 0 {
log.Fatalln("invalid:", kw, st)
}
lw := w[len(w)-1]
switch kw {
case "win":
ww = w
case "lose":
ww, lw = lw, w
default:
ww = kw
for i := 0; ; i++ {
if i == len(w) {
st = ww + " " + st
break
}
if w[i] == ww {
break
}
}
}
if lw == ww {
log.Fatalln("invalid:", st)
}
if cs, ok := d[lw][ww]; ok {
log.Fatalln("conflict:", cs, "and", st)
}
d1, ok := d[ww]
if !ok {
d1 = map[string]string{}
}
d1[lw] = st
d[ww] = d1
}
}

func play(title string, fx fIndex, d decision) {
rand.Seed(time.Now().Unix())
if len(fx) == 0 {
return
}
form := make([]string, len(fx))
for w, i := range fx {
form[i] = w
}
fmt.Println()
fmt.Println(title)
fmt.Print("Choices are ", form)
for _, w := range form[1:] {
fmt.Printf(", %s", w)
}
fmt.Println(".")
fmt.Println("Enter one of these choices as your play.  " +
"Anything else ends the game.")
fmt.Println("Running score shown as <your wins>:<my wins>")
var pw string
var aScore, pScore int
sl := 3
wcf := make([]int, len(form))
wct := 0
ax := rand.Intn(len(form))
aw := form[ax]
for {
fmt.Print("Play: ")
_, err := fmt.Scanln(&pw)
if err != nil {
break
}
px, ok := fx[pw]
if !ok {
fmt.Println(pw, "invalid.")
break
}
for f, l := range d {
if _, ok := l[pw]; ok {
wcf[fx[f]]++
wct++
}
}

fmt.Printf("My play:%s%s.\n", strings.Repeat(" ", sl-2), aw)
ast := d[aw][pw]
pst := d[pw][aw]
switch {
case ax == px:
fmt.Println("Tie.")
case ast > "" && pst > "":
log.Fatalln("conflict: ", ast, "and", pst)
case ast > "":
fmt.Printf("%s.  My point.\n", ast)
aScore++
default:
pScore++
}
sl, _ = fmt.Printf("%d:%d  ", pScore, aScore)
ax = 0
for rn := rand.Intn(wct); ; ax++ {
if f := wcf[ax]; rn < f {
break
} else {
rn -= f
}
}
aw = form[ax]
}
}
```

Example game files:

```# example unbalanced game described with both win and lose statements

title = "Rock Paper Scissors Well"
win = [
"rock breaks scissors",
"paper covers rock",
"paper covers well",
"scissors cut paper",
]
lose = [
"rock falls into well",
"scissors fall into well",
]
```
```# example with implied wins, parenthetical word.

title = "RPS-7"
rock = [
"pounds out fire",
"crushes scissors",
"crushes sponge",
]
fire = [
"melts scissors",
"burns paper",
"burns sponge",
]
scissors = [
"swish through air",
"cut paper",
"cut sponge",
]
sponge = [
"soaks paper",
"uses air (pockets)",
"absorbs water",
]
paper = [
"fans air",
"covers rock",
"floats on water",
]
air = [
"blows out fire",
"erodes rock",
"evaporates water",
]
water = [
"erodes rock",
"puts out fire",
"rusts scissors",
]
```
Example output:
```> rps rpsw
2014/05/20 20:42:03 note, game is unbalanced

Rock Paper Scissors Well
Choices are rock, scissors, paper, well.
Enter one of these choices as your play.  Anything else ends the game.
Running score shown as <your wins>:<my wins>
Play: rock
My play: rock.
Tie.
0:0  Play: well
My play:   paper.
paper covers well.  My point.
0:1  Play: scissors
My play:   paper.
1:1  Play: well
My play:   paper.
paper covers well.  My point.
1:2  Play:

> rps rps7

RPS-7
Choices are rock, scissors, sponge, fire, paper, air, water.
Enter one of these choices as your play.  Anything else ends the game.
Running score shown as <your wins>:<my wins>
Play: air
My play: water.
1:0  Play:
```

```import System.Random (randomRIO)

data Choice
= Rock
| Paper
| Scissors
deriving (Show, Eq)

beats :: Choice -> Choice -> Bool
beats Paper Rock = True
beats Scissors Paper = True
beats Rock Scissors = True
beats _ _ = False

genrps :: (Int, Int, Int) -> IO Choice
genrps (r, p, s) = rps <\$> rand
where
rps x
| x <= s = Rock
| x <= s + r = Paper
| otherwise = Scissors
rand = randomRIO (1, r + p + s) :: IO Int

getrps :: IO Choice
getrps = rps <\$> getLine
where
rps "scissors" = Scissors
rps "rock" = Rock
rps "paper" = Paper
rps _ = error "invalid input"

game :: (Int, Int, Int) -> IO a
game (r, p, s) = do
putStrLn "rock, paper or scissors?"
h <- getrps
c <- genrps (r, p, s)
putStrLn ("Player: " ++ show h ++ " Computer: " ++ show c)
putStrLn
(if beats h c
then "player wins\n"
else if beats c h
then "player loses\n"
else "draw\n")
let rr =
if h == Rock
then r + 1
else r
pp =
if h == Paper
then p + 1
else p
ss =
if h == Scissors
then s + 1
else s
game (rr, pp, ss)

main :: IO a
main = game (1, 1, 1)
```

## Icon and Unicon

The key to this comes down to two structures and two lines of code. The player history historyP is just an ordered list of every player turn and provides the weight for the random selection. The beats list is used to rank moves and to choose the move that would beat the randomly selected move.

```link printf

procedure main()

printf("Welcome to Rock, Paper, Scissors.\n_
Rock beats scissors, Scissors beat paper, and Paper beats rock.\n\n")

historyP := ["rock","paper","scissors"]      # seed player history
winP := winC := draws := 0                   # totals

beats := ["rock","scissors","paper","rock"]  # what beats what 1 apart

repeat {
printf("Enter your choice or rock(r), paper(p), scissors(s) or quit(q):")
turnP := case map(read()) of {
"q"|"quit": break
"r"|"rock": "rock"
"p"|"paper": "paper"
"s"|"scissors": "scissors"
default:  printf(" - invalid choice.\n") & next
}

turnC := beats[(?historyP == beats[i := 2 to *beats],i-1)]  # choose move

put(historyP,turnP)                       # record history
printf("You chose %s, computer chose %s",turnP,turnC)

(beats[p := 1 to *beats] == turnP) &
(beats[c := 1 to *beats] == turnC) & (abs(p-c) <= 1)  # rank play

if p = c then
printf(" - draw (#%d)\n",draws +:= 1 )
else if p > c then
printf(" - player win(#%d)\n",winP +:= 1)
else
printf(" - computer win(#%d)\n",winC +:= 1)
}

printf("\nResults:\n %d rounds\n %d Draws\n %d Computer wins\n %d Player wins\n",
winP+winC+draws,draws,winC,winP)
end
```
Sample output:
```Welcome to Rock, Paper, Scissors.
Rock beats scissors, Scissors beat paper, and Paper beats rock.

Enter your choice or rock(r), paper(p), scissors(s) or quit(q):s
You chose scissors, computer chose scissors - draw (#1)
Enter your choice or rock(r), paper(p), scissors(s) or quit(q):p
You chose paper, computer chose paper - draw (#2)
Enter your choice or rock(r), paper(p), scissors(s) or quit(q):r
You chose rock, computer chose scissors - computer win(#1)
Enter your choice or rock(r), paper(p), scissors(s) or quit(q):r
You chose rock, computer chose rock - draw (#3)
Enter your choice or rock(r), paper(p), scissors(s) or quit(q):p
You chose paper, computer chose paper - draw (#4)
Enter your choice or rock(r), paper(p), scissors(s) or quit(q):s
You chose scissors, computer chose scissors - draw (#5)
Enter your choice or rock(r), paper(p), scissors(s) or quit(q):r
You chose rock, computer chose rock - draw (#6)
Enter your choice or rock(r), paper(p), scissors(s) or quit(q):r
You chose rock, computer chose paper - player win(#1)
Enter your choice or rock(r), paper(p), scissors(s) or quit(q):q

Results:
8 rounds
6 Draws
1 Computer wins
1 Player wins```

## IS-BASIC

```100 PROGRAM "Rock.bas"
110 RANDOMIZE
120 STRING CH\$(1 TO 3)*8,K\$*1
130 NUMERIC PLWINS(1 TO 3),SCORE(1 TO 3),PLSTAT(1 TO 3),CMSTAT(1 TO 3),PLCHOICE,CMCHOICE
140 CALL INIC
150 DO
160   CALL GUESS
170   PRINT :PRINT "Rock, paper, or scissors (1 = rock, 2 = paper, 3 = scissors, ESC = quit)"
180   DO
190     LET K\$=INKEY\$
200   LOOP UNTIL K\$>="1" AND K\$<="3" OR K\$=CHR\$(27)
210   IF K\$=CHR\$(27) THEN EXIT DO
220   LET PLCHOICE=VAL(K\$)
230   LET CMSTAT(CMCHOICE)=CMSTAT(CMCHOICE)+1:LET PLSTAT(PLCHOICE)=PLSTAT(PLCHOICE)+1
240   PRINT "You chose ";CH\$(PLCHOICE);" and I chose ";CH\$(CMCHOICE);"."
250   SET #102:INK 3
260   IF PLCHOICE=CMCHOICE THEN
270     PRINT "Tie!"
280     LET SCORE(3)=SCORE(3)+1
290   ELSE IF CMCHOICE=PLWINS(PLCHOICE) THEN
300     PRINT "You won!"
310     LET SCORE(1)=SCORE(1)+1
320   ELSE
330     PRINT "I won!"
340     LET SCORE(2)=SCORE(2)+1
350   END IF
360   SET #102:INK 1
370 LOOP
380 PRINT :PRINT "Some useless statistics:"
390 PRINT "You won";SCORE(1);"times, and I won";SCORE(2);"times;";SCORE(3);"ties."
400 PRINT :PRINT ,,CH\$(1),CH\$(2),CH\$(3)
410 PRINT "You chose:",PLSTAT(1),PLSTAT(2),PLSTAT(3)
420 PRINT "  I chose:",CMSTAT(1),CMSTAT(2),CMSTAT(3)
430 END
440 DEF INIC
450   LET CH\$(1)="rock":LET CH\$(2)="paper":LET CH\$(3)="scissors"
460   LET PLWINS(1)=3:LET PLWINS(2)=1:LET PLWINS(3)=2
470   FOR I=1 TO 3
480     LET PLSTAT(I),CMSTAT(I),SCORE(I)=0
490   NEXT
500   TEXT 80
510 END DEF
520 DEF GUESS
530   LET CMCHOICE=INT(RND*(PLSTAT(1)+PLSTAT(2)+PLSTAT(3)+3))
540   SELECT CASE CMCHOICE
550   CASE 0 TO PLSTAT(1)
560     LET CMCHOICE=2
570   CASE PLSTAT(1)+1 TO PLSTAT(1)+PLSTAT(2)+1
580     LET CMCHOICE=3
590   CASE ELSE
600     LET CMCHOICE=1
610   END SELECT
620 END DEF```

## J

```require'general/misc/prompt strings' NB. was 'misc strings' in older versions of J
game=:3 :0
outcomes=. rps=. 0 0 0
choice=. 1+?3
while.#response=. prompt'  Choose Rock, Paper or Scissors: ' do.
playerchoice=. 1+'rps' i. tolower {.deb response
if.4 = playerchoice do.
smoutput 'Unknown response.'
smoutput 'Enter an empty line to quit'
continue.
end.
smoutput '    I choose ',choice {::;:'. Rock Paper Scissors'
smoutput (wintype=. 3 | choice-playerchoice) {:: 'Draw';'I win';'You win'
outcomes=. outcomes+0 1 2 = wintype
rps=. rps+1 2 3=playerchoice
choice=. 1+3|(?0) I.~ (}:%{:)+/\ 0, rps
end.
)
```

Example use (playing to give the computer implementation the advantage):

```   game''
Choose Rock, Paper or Scissors: rock
I choose Scissors
You win
Choose Rock, Paper or Scissors: rock
I choose Paper
I win
Choose Rock, Paper or Scissors: rock
I choose Paper
I win
Choose Rock, Paper or Scissors: rock
I choose Paper
I win
Choose Rock, Paper or Scissors: rock
I choose Paper
I win
Choose Rock, Paper or Scissors:
Draws:     0
My wins:   4
```

## Java

Works with: Java version 1.5+

This could probably be made simpler, but some more complexity is necessary so that other items besides rock, paper, and scissors can be added (as school children and nerds like to do [setup for rock-paper-scissors-lizard-spock is in multi-line comments]). The method `getAIChoice()` borrows from the Ada example in spirit, but is more generic to additional items.

```import java.util.Arrays;
import java.util.EnumMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.Random;

public class RPS {
public enum Item{
ROCK, PAPER, SCISSORS, /*LIZARD, SPOCK*/;
public List<Item> losesToList;
public boolean losesTo(Item other) {
return losesToList.contains(other);
}
static {
SCISSORS.losesToList = Arrays.asList(ROCK/*, SPOCK*/);
ROCK.losesToList = Arrays.asList(PAPER/*, SPOCK*/);
PAPER.losesToList = Arrays.asList(SCISSORS/*, LIZARD*/);
/*
SPOCK.losesToList = Arrays.asList(PAPER, LIZARD);
LIZARD.losesToList = Arrays.asList(SCISSORS, ROCK);
*/
}
}
//EnumMap uses a simple array under the hood
public final Map<Item, Integer> counts = new EnumMap<Item, Integer>(Item.class){{
for(Item item:Item.values())
put(item, 1);
}};

private int totalThrows = Item.values().length;

public static void main(String[] args){
RPS rps = new RPS();
rps.run();
}

public void run() {
Scanner in = new Scanner(System.in);
while(in.hasNextLine()){
Item aiChoice = getAIChoice();
String input = in.nextLine();
Item choice;
try{
choice = Item.valueOf(input.toUpperCase());
}catch (IllegalArgumentException ex){
System.out.println("Invalid choice");
continue;
}
counts.put(choice, counts.get(choice) + 1);
totalThrows++;
System.out.println("Computer chose: " + aiChoice);
if(aiChoice == choice){
System.out.println("Tie!");
}else if(aiChoice.losesTo(choice)){
System.out.println("You chose...wisely. You win!");
}else{
System.out.println("You chose...poorly. You lose!");
}
}
}

private static final Random rng = new Random();
private Item getAIChoice() {
int rand = rng.nextInt(totalThrows);
for(Map.Entry<Item, Integer> entry:counts.entrySet()){
Item item = entry.getKey();
int count = entry.getValue();
if(rand < count){
List<Item> losesTo = item.losesToList;
return losesTo.get(rng.nextInt(losesTo.size()));
}
rand -= count;
}
return null;
}
}
```

Sample output:

```Make your choice: rock
Computer chose: PAPER
You chose...poorly. You lose!
Computer chose: SCISSORS
You chose...wisely. You win!
Computer chose: PAPER
You chose...poorly. You lose!
Computer chose: SCISSORS
You chose...wisely. You win!
Computer chose: PAPER
You chose...poorly. You lose!
Computer chose: ROCK
Tie!
Computer chose: ROCK
Tie!
Computer chose: PAPER
You chose...poorly. You lose!
Computer chose: PAPER
You chose...poorly. You lose!
Computer chose: PAPER
You chose...poorly. You lose!
Computer chose: PAPER
You chose...wisely. You win!
Computer chose: PAPER
You chose...wisely. You win!
...```

## JavaScript

```const logic = {
rock: { w: 'scissor', l: 'paper'},
paper: {w:'rock', l:'scissor'},
scissor: {w:'paper', l:'rock'},
}

class Player {
constructor(name){
this.name = name;
}
setChoice(choice){
this.choice = choice;
}
challengeOther(PlayerTwo){
return logic[this.choice].w === PlayerTwo.choice;
}
}

const p1 = new Player('Chris');
const p2 = new Player('John');

p1.setChoice('rock');
p2.setChoice('scissor');

p1.challengeOther(p2); //true (Win)
```

## jq

```# To quit, enter a blank line or type "q" or "quit"
def choices: ["r", "p", "s", "q"];

# The main source of entropy for this pseudo pseudo random number generator is the player :-)
# PRN in range(0;3)
def rand: now * 100 | floor | tostring[-2:] | tonumber % 3;

def tallies:
{pWins: 0,          # player wins
cWins: 0,          # computer wins
draws: 0,          # neither wins
games: 0,          # games played
pFreqs: [0, 0, 0]  # player frequencies for each choice (rps)
};

# Update the tallies and populate .emit
def update(\$pChoice; \$cChoice):
if \$pChoice == "r" and \$cChoice == "s"
then .emit += "Rock breaks scissors - You win!"
| .pWins += 1
elif \$pChoice == "p" and \$cChoice == "r"
then .emit += "Paper covers rock - You win!"
| .pWins += 1
elif \$pChoice == "s" and \$cChoice == "p"
then .emit += "Scissors cut paper - You win!"
| .pWins +=  1
elif \$pChoice == "s" and \$cChoice == "r"
then .emit += "Rock breaks scissors - Computer wins!"
| .cWins += 1
elif \$pChoice == "r" and \$cChoice == "p"
then .emit += "Paper covers rock - Computer wins!"
| .cWins +=  1
elif \$pChoice == "p" and \$cChoice == "s"
then .emit += "Scissors cut paper - Computer wins!"
| .cWins +=  1
else .emit += "It's a draw!"
| .draws += 1
end
| .pFreqs[choices|index(\$pChoice)] += 1
| .games += 1 ;

def printScore:
"Wins: You \(.pWins), Computer \(.cWins), Neither \(.draws)\n";

def getComputerChoice:
# make a completely random choice until 3 games have been played
if .games < 3 then choices[rand]
else .games as \$games
| (.pFreqs | map(3 * . / \$games)) as \$pFreqs
| rand as \$num
| if \$num < \$pFreqs then "p"
elif \$num < \$pFreqs + \$pFreqs then "s"
else "r"
end
end ;

# Get player's choice (empty line or q or quit to quit).
# Return false if the choice is not recognized.
def pChoice:
(first(inputs) // null) as \$in
| if \$in == null or \$in == "q" or \$in == "quit" then null
else (\$in|ascii_downcase) as \$in
| if any(choices[]; . == \$in) then \$in
else false
end
end;

# Solicit input
def prompt:
if .games == 0
then "Enter: (r)ock, (p)aper, (s)cissors or (q)uit"
else  printScore + "---\n\nYour choice r/p/s/q : "
end;

def play:
label \$out
| foreach range(1; infinite) as \$i (tallies ;
# if .prompt then it is time to get input:
if .prompt
then pChoice as \$pChoice
| if \$pChoice == null
then .prompt = false
| .emit = "OK, quitting", break \$out
elif \$pChoice == false
then .emit = "Valid responses are one of r p s q\nPlease try again."
else getComputerChoice as \$cChoice
| .prompt = false
| .emit = "Computer's choice   : \(\$cChoice)\n"
| update(\$pChoice; \$cChoice)
end
else .prompt = prompt
| .emit = null
end )

| select(.emit).emit,
select(.prompt).prompt ;

play```

Invocation: jq -nrR -f rock-paper-scissors.jq

Sample game

```Enter: (r)ock, (p)aper, (s)cissors or (q)uit
?
Valid responses are one of r p s q
Enter: (r)ock, (p)aper, (s)cissors or (q)uit
r
Computer's choice   : r
It's a draw!
Wins: You 0, Computer 0, Neither 1
---

p
Computer's choice   : s
Scissors cut paper - Computer wins!
Wins: You 0, Computer 1, Neither 1
---

s
Computer's choice   : s
It's a draw!
Wins: You 0, Computer 1, Neither 2
---

OK, quitting
```

## Julia

```function rps()
r(ock), p(aper), or s(cissors)\n
Enter 'q' to quit.\n>")
comp_score = 0
user_score = 0
options = ["r","p","s"]
new_pick() = options[rand(1:3)]
i_win(m,y) = ((m == "r" && y == "s")|(m == "s" && y == "p")|(m == "p" && y == "r"))
while true
input == "q" && break
!ismatch(r"^[rps]",input) && begin print("Invalid guess: Please enter 'r', 'p', or 's'\n"); continue end
print("\nTie!\nScore still: \nyou \$user_score\nme  \$comp_score\n>")
continue
else
i_win(answer,input) ? (comp_score += 1) : (user_score += 1)
print(i_win(answer,input) ? "\nSorry you lose!\n" : "\nYou win!","Score: \nyou \$user_score\nme  \$comp_score\n>")
end
end
end
```
```julia> rps()

r(ock), p(aper), or s(cissors)

Enter 'q' to quit.
>r

You win!Score:
you 1
me  0
>p

Sorry you lose!
Score:
you 1
me  1
>s

You win!Score:
you 2
me  1```

## Kotlin

```// version 1.2.10

import java.util.Random

const val choices = "rpsq"
val rand = Random()

var pWins = 0                  // player wins
var cWins = 0                  // computer wins
var draws = 0                  // neither wins
var games = 0                  // games played
val pFreqs = arrayOf(0, 0, 0)  // player frequencies for each choice (rps)

fun printScore() = println("Wins: You \$pWins, Computer \$cWins, Neither \$draws\n")

fun getComputerChoice(): Char {
// make a completely random choice until 3 games have been played
if (games < 3) return choices[rand.nextInt(3)]
val num = rand.nextInt(games)
return when {
num < pFreqs -> 'p'
num < pFreqs + pFreqs -> 's'
else -> 'r'
}
}

fun main(args: Array<String>) {
println("Enter: (r)ock, (p)aper, (s)cissors or (q)uit\n")
while (true) {
printScore()
var pChoice: Char
while (true) {
if (input.length == 1) {
pChoice = input
if (pChoice in choices) break
}
println("Invalid choice, try again")
}
if (pChoice == 'q') {
println("OK, quitting")
return
}
val cChoice = getComputerChoice()
println("Computer's choice   : \$cChoice")
if (pChoice == 'r' && cChoice == 's') {
println("Rock breaks scissors - You win!")
pWins++
}
else if (pChoice == 'p' && cChoice == 'r') {
println("Paper covers rock - You win!")
pWins++
}
else if (pChoice == 's' && cChoice == 'p') {
println("Scissors cut paper - You win!")
pWins++
}
else if (pChoice == 's' && cChoice == 'r') {
println("Rock breaks scissors - Computer wins!")
cWins++
}
else if (pChoice == 'r' && cChoice == 'p') {
println("Paper covers rock - Computer wins!")
cWins++
}
else if (pChoice == 'p' && cChoice == 's') {
println("Scissors cut paper - Computer wins!")
cWins++
}
else {
println("It's a draw!")
draws++
}
pFreqs[choices.indexOf(pChoice)]++
games++
println()
}
}
```

Sample session:

```Enter: (r)ock, (p)aper, (s)cissors or (q)uit

Wins: You 0, Computer 0, Neither 0

Computer's choice   : r
It's a draw!

Wins: You 0, Computer 0, Neither 1

Computer's choice   : s
Scissors cut paper - Computer wins!

Wins: You 0, Computer 1, Neither 1

Computer's choice   : r
Paper covers rock - You win!

Wins: You 1, Computer 1, Neither 1

Computer's choice   : s
It's a draw!

Wins: You 1, Computer 1, Neither 2

Computer's choice   : p
It's a draw!

Wins: You 1, Computer 1, Neither 3

OK, quitting
```

## Lasso

Notes: This implementation uses the default session handling in Lasso, and assumes it's running on a web server. User choices are passed in via HTTP as GET query parameters.

```session_start('user')
var(historic_choices)->isNotA(::map) ? var(historic_choices = map('rock'=0, 'paper'=0, 'scissors'=0))
var(plays)->isNotA(::integer) ? var(plays = 0)
var(win_record)->isNotA(::array) ? var(win_record = array)

define br => '<br>'
define winner(c::string,p::string) => {
if(#c == \$superior->find(#p)) => {
\$win_record->insert('lasso')
return 'Lasso'
else(#p == \$superior->find(#c))
\$win_record->insert('user')
return 'User'
else
\$win_record->insert('tie')
return 'Nobody'
}
}

var(
choice 				= web_request->param('choice')->asString,
lookup 				= array('rock', 'paper', 'scissors'),
computer_choice 	= \$lookup->get(math_random(3,1)),
superior			= map('rock'='paper', 'paper'='scissors', 'scissors'='rock'),
controls			= '<a href=?choice=rock>Rock</a> <a href=?choice=paper>Paper</a> <a href=?choice=scissors>Scissors</a> <a href=?choice=quit>Quit</a><br/>'
)
if(\$choice == 'quit') => {^
'See ya. <a href=?>Start over</a>'
session_end('user')
\$historic_choices = map('rock'=0, 'paper'=0, 'scissors'=0)
\$plays = 0
\$win_record = array

else(array('rock','paper','scissors') >> \$choice)
\$controls

if(\$plays != 0) => {
local('possibilities') = array
with i in \$lookup do => {
loop(\$historic_choices->find(#i)) => { #possibilities->insert(#i) }
}

\$computer_choice = \$superior->find(#possibilities->get(math_random(\$plays,1)))
}

'User chose ' + \$choice + br
'Lasso chose ' + \$computer_choice + br
winner(\$computer_choice->asString, \$choice) + ' wins!'

\$historic_choices->find(\$choice) = \$historic_choices->find(\$choice)+1
\$plays += 1

else(\$choice->size == 0)
\$controls

else
'Invalid Choice.'+ br + \$controls
^}
if(\$win_record->size) => {^
br
br
'Win record: '+br
'Lasso: '+(\$win_record->find('lasso')->size)+br
'User: '+(\$win_record->find('user')->size)+br
'Tie: '+(\$win_record->find('tie')->size)+br
^}
```
Output:
```Rock Paper Scissors Quit (<- as links)
User chose paper
Lasso chose rock
User wins!

Win record:
Lasso: 2
User: 1
Tie: 3```

## Liberty BASIC

```dim rps( 2), g\$( 3)

g\$( 0) ="rock": g\$( 1) ="paper": g\$( 2) ="scissors"
global total

total =0: draw  =0: pwin  =0: cwin  =0

rps( 0) =1: rps( 1) =1: rps( 2) =1          '   at first computer will play all three with equal probability

c =int( 3 *rnd( 1))                         '   first time, computer response is random

'   In the following code we set three integer %ages for the <human>'s biassed throws.
'   set up the <human> player's key frequencies as %ages.
'   Done like this it's easy to mimic the <human> input of q\$
'   It allows only integer %age frequency- not an important thing.
rockP =45                                   '   <<<<<<<<< Set here the <human>'s %age of 'rock' choices.
for i =1 to rockP: qF\$ =qF\$ +"R": next i

paprP =24                                    '   <<<<<<<<< Set here the %age of 'paper' choices.
for i =1 to paprP: qF\$ =qF\$ +"P": next i

scisP =100 -rockP -paprP                    '   <<<<<<<<< %age 'scissors' calculated to make 100%
for i =1 to scisP: qF\$ =qF\$ +"S": next i
'print qF\$

do
'do: input q\$:loop until instr( "RPSrpsQq", q\$)   '   for actual human input... possibly biassed.         <<<<<<<<<<<<< REM one or the other line...
q\$ =mid\$( qF\$, int( 100 *rnd( 1)), 1)              '   simulated <human> input with controlled bias.      <<<<<<<<<<<<<

if total >10000 then q\$ ="Q"

g =int( ( instr( "RrPpSsQq", q\$) -1) / 2)
if g >2 then [endGame]

total    =total   +1
rps( g)  =rps( g) +1  '   accumulate plays the <human> has chosen. ( & hence their (biassed?) frequencies.)
'print "  You chose "; g\$( g); " and I chose "; g\$( c); ". "

select case g -c
case 0
draw =draw +1  ':print "It's a draw"
case 1, -2
pwin =pwin +1  ':print "You win!"
case -1, 2
cwin =cwin +1  ':print "I win!"
end select

r =int( total *rnd( 1))      '   Now select computer's choice for next confrontation.
select case                  '   Using the accumulating data about <human>'s frequencies so far.
case r <=rps( 0)
c =1
case r <=( rps( 0) +rps( 1))
c =2
case else
c =0
end select

scan
loop until 0

[endGame]
print
print "  You won "; pwin; ", and I won "; cwin; ". There were "; draw; " draws."
if cwin >pwin then print "      I AM THE CHAMPION!!" else print "        You won this time."
print
print "  At first I assumed you'd throw each equally often."
print "  This means I'd win 1 time in 3; draw 1 in 3; lose 1 in 3."
print "  However if I detect a bias in your throws,...."
print "  ....this allows me to anticipate your most likely throw & on average beat it."
print
print "  In fact, keyboard layout & human frailty mean even if you TRY to be even & random..."
print "  ... you may be typing replies with large bias. In 100 tries I gave 48 'P's, 29 'R' & 23 'S'!"
print
print "    This time I played.."
print "      Rock "; using( "##.##", rps( 2)* 100 /total); "%    Paper "; using( "##.##", rps( 0) *100 /total); "%    Scissors "; using( "##.##", rps( 1) *100 /total); "%."
print
print "  ( PS. I have since learned your actual bias had been.."
print "      Rock "; using( "##.##", rockP); "%    Paper "; using( "##.##", paprP ); "%    Scissors "; using( "##.##", ( 100 -rockP -paprP)); "%.)"
print
print "  The advantage I can gain gets bigger the further the 'human' entries are biassed."
print "  The results statistically smooth out better with large runs."
print "  Try 10,000,000, & have a cuppa while you wait."
print
print "  Can you see what will happen if, say, the 'human' is set to give 'Rock' EVERY time?"
print "  Try different %ages by altering the marked code lines."
print
print "  Thanks for playing!"
end```
``` You won 3204, and I won 3669. There were 3128 draws.
I AM THE CHAMPION!!

At first I assumed you'd throw each equally often.
This means I'd win 1 time in 3; draw 1 in 3; lose 1 in 3.
However if I detect a bias in your throws,....
....this allows me to anticipate your most likely throw & on average beat it.

In fact, keyboard layout & human frailty mean even if you TRY to be even & random...
... you may be typing replies with large bias. In 100 tries I gave 48 'P's, 29 'R' & 23 'S'!

This time I played..
Rock 30.17%    Paper 45.93%    Scissors 23.94%.

Rock 45.00%    Paper 24.00%    Scissors 31.00%.)

The advantage I can gain gets bigger the further the 'human' entries are biassed.
The results statistically smooth out better with large runs.
Try 10,000,000, & have a cuppa while you wait.

Can you see what will happen if, say, the 'human' is set to give 'Rock' EVERY time?
Try different %ages by altering the marked code lines.
```

## Locomotive Basic

Translation of: Go
```10 mode 1:defint a-z:randomize time
20 rps\$="rps"
30 msg\$(1)="Rock breaks scissors"
40 msg\$(2)="Paper covers rock"
50 msg\$(3)="Scissors cut paper"
60 print "Rock Paper Scissors":print
70 print "Enter r, p, or s as your play."
80 print "Running score shown as <your wins>:<my wins>"
90 achoice=rnd*2.99+.5 ' get integer between 1 and 3 from real between .5 and <3.5
100 ' get key
110 pin\$=inkey\$
120 if pin\$="" then 110
130 pchoice=instr(rps\$,pin\$)
140 if pchoice=0 then print "Sorry?":goto 110
150 pcf(pchoice)=pcf(pchoice)+1
160 plays=plays+1
170 print "My play: "mid\$(rps\$,achoice,1)
180 sw=(achoice-pchoice+3) mod 3
190 if sw=0 then print "Tie." else if sw=1 then print msg\$(achoice);". My point.":ascore=ascore+1 else print msg\$(pchoice);". Your point.":pscore=pscore+1
200 print pscore":"ascore
210 rn=rnd*plays
220 if rn<pcf(1) then achoice=2 else if rn<pcf(1)+pcf(2) then achoice=3 else achoice=1
230 goto 110
```

## Lua

```function cpuMove()
local totalChance = record.R + record.P + record.S
if totalChance == 0 then  -- First game, unweighted random
local choice = math.random(1, 3)
if choice == 1 then return "R" end
if choice == 2 then return "P" end
if choice == 3 then return "S" end
end
local choice = math.random(1, totalChance)  -- Weighted random bit
if choice <= record.R then return "P" end
if choice <= record.R + record.P then return "S" end
return "R"
end

function playerMove()  -- Get user input for choice of 'weapon'
local choice
repeat
os.execute("cls")  -- Windows specific command, change per OS
print("\nRock, Paper, Scissors")
print("=====================\n")
print("Scores -\tPlayer:", score.player)
print("\t\tCPU:", score.cpu .. "\n\t\tDraws:", score.draws)
io.write("\nChoose [R]ock [P]aper or [S]cissors: ")
until choice == "R" or choice == "P" or choice == "S"
return choice
end

-- Decide who won, increment scores
function checkWinner (c, p)
io.write("I chose ")
if c == "R" then print("rock...") end
if c == "P" then print("paper...") end
if c == "S" then print("scissors...") end
if c == p then
print("\nDraw!")
score.draws = score.draws + 1
elseif  (c == "R" and p == "P") or
(c == "P" and p == "S") or
(c == "S" and p == "R") then
print("\nYou win!")
score.player = score.player + 1
else
print("\nYou lose!")
score.cpu = score.cpu + 1
end
end

-- Main procedure
math.randomseed(os.time())
score = {player = 0, cpu = 0, draws = 0}
record = {R = 0, P = 0, S = 0}
local playerChoice, cpuChoice
repeat
cpuChoice = cpuMove()
playerChoice = playerMove()
record[playerChoice] = record[playerChoice] + 1
checkWinner(cpuChoice, playerChoice)
io.write("\nPress ENTER to continue or enter 'Q' to quit . . . ")
```

Session in which I chose nothing but rock:

```Rock, Paper, Scissors
=====================

Scores -        Player: 1
CPU:    25
Draws:  0

Choose [R]ock [P]aper or [S]cissors: r
I chose paper...

You lose!

Press ENTER to continue or enter 'Q' to quit . . .
```

## Mathematica/Wolfram Language

```DynamicModule[{record, play, text = "\nRock-paper-scissors\n",
choices = {"Rock", "Paper", "Scissors"}},
Evaluate[record /@ choices] = {1, 1, 1};
play[x_] :=
Module[{y = RandomChoice[record /@ choices -> RotateLeft@choices]},
record[x]++;
text = "Your Choice:" <> x <> "\nComputer's Choice:" <> y <> "\n" <>
Switch[{x, y}, Alternatives @@ Partition[choices, 2, 1, 1],
"You lost.",
Alternatives @@ Reverse /@ Partition[choices, 2, 1, 1],
"You win.", _, "Draw."]];
Column@{Dynamic[text], ButtonBar[# :> play[#] & /@ choices]}]
```

## Mercury

Translation of: Prolog
```:- module rps.
:- interface.
:- import_module io.
:- pred main(io::di, io::uo) is det.
:- implementation.
:- use_module random, exception.
:- import_module list, string.

:- type play
--->    rock
;       paper
;       scissors.

:- pred beats(play, play).
:- mode beats(in, in) is semidet.
beats(rock, scissors).
beats(paper, rock).
beats(scissors, paper).

:- pred random(play::out, random.supply::mdi, random.supply::muo) is det.
random(Play, !RS) :-
random.random(1, 3, N, !RS),
( if N = 1 then
Play = rock
else if N = 2 then
Play = paper
else
Play = scissors
).

main(!IO) :-
seed(Seed, !IO),
random.init(Seed, RS),
play(RS, !IO).

:- pred play(random.supply::mdi, io::di, io::uo) is det.
play(!.RS, !IO) :-
(
Res = ok(Play),
random(Counter, !RS),
io.format("The computer chose %s\n", [s(string(Counter))], !IO),
( if beats(Counter, Play) then
io.write_string("Computer wins.\n", !IO)
else if beats(Play, Counter) then
io.write_string("You win!\n", !IO)
else
io.write_string("It is a draw\n", !IO)
),
play(!.RS, !IO)
;
Res = eof
;
Res = error(_, _),
exception.throw(Res)
).

:- pragma foreign_decl("C", "#include <time.h>").
:- pred seed(int::out, io::di, io::uo) is det.
:- pragma foreign_proc("C",
seed(Seed::out, _IO0::di, _IO::uo),
[promise_pure, will_not_call_mercury],
"
Seed = time(NULL);
").```

## Nim

```import random, strutils, tables

type
Choice {.pure.} = enum Rock, Paper, Scissors
History = tuple[total: int; counts: CountTable[Choice]]

const Successor: array[Choice, Choice] = [Paper, Scissors, Rock]

func `>`(a, b: Choice): bool =
## By construction, only the successor is greater than the choice.
a == Successor[b]

proc choose(history: History): Choice =
## Make a weighted random choice using the player counts
## then select the choice likely to beat it.
var value = rand(1..history.total)
for choice, count in history.counts.pairs:
if value <= count:
return Successor[choice]
dec value, count

randomize()

# Initialize history with one for each choice in order to avoid special case.
var history: History = (3, [Rock, Paper, Scissors].toCountTable)

var myChoice, yourChoice: Choice
var myWins, yourWins = 0

while true:

# Get player choice.
try:
stdout.write "Rock(1), paper(2), scissors(3). Your choice? "
quit "Quitting game.", QuitSuccess
if answer notin ["1", "2", "3"]:
echo "Invalid choice."
continue
except EOFError:
quit "Quitting game.", QuitFailure

# Make my choice.
myChoice = history.choose()
echo "I choosed ", myChoice, '.'
history.counts.inc yourChoice
inc history.total

# Display result of round.
if myChoice == yourChoice:
echo "It’s a tie."
elif myChoice > yourChoice:
echo "I win."
inc myWins
else:
echo "You win."
inc yourWins
echo "Total wins. You: ", yourWins, "  Me: ", myWins
```
Output:
```To quit game, type 'q' when asked for your choice.
Rock(1), paper(2), scissors(3). Your choice? 1
I choosed Rock.
It’s a tie.
Total wins. You: 0  Me: 0
Rock(1), paper(2), scissors(3). Your choice? 1
I choosed Rock.
It’s a tie.
Total wins. You: 0  Me: 0
Rock(1), paper(2), scissors(3). Your choice? 1
I choosed Paper.
I win.
Total wins. You: 0  Me: 1
Rock(1), paper(2), scissors(3). Your choice? 1
I choosed Rock.
It’s a tie.
Total wins. You: 0  Me: 1
Rock(1), paper(2), scissors(3). Your choice? 1
I choosed Paper.
I win.
Total wins. You: 0  Me: 2
Rock(1), paper(2), scissors(3). Your choice? 1
I choosed Paper.
I win.
Total wins. You: 0  Me: 3
Rock(1), paper(2), scissors(3). Your choice? 1
I choosed Paper.
I win.
Total wins. You: 0  Me: 4
Rock(1), paper(2), scissors(3). Your choice? 1
I choosed Paper.
I win.
Total wins. You: 0  Me: 5
Rock(1), paper(2), scissors(3). Your choice? 1
I choosed Paper.
I win.
Total wins. You: 0  Me: 6
Rock(1), paper(2), scissors(3). Your choice? q
Quitting game.```

## NS-HUBASIC

```10 COMPUTER=RND(3)+1
20 COMPUTER\$="ROCK"
30 IF COMPUTER=2 THEN COMPUTER\$="PAPER"
40 IF COMPUTER=3 THEN COMPUTER\$="SCISSORS"
50 INPUT "ROCK, PAPER OR SCISSORS? ",HUMAN\$
60 IF HUMAN\$="ROCK" THEN GOTO 100
70 IF HUMAN\$="PAPER" THEN GOTO 100
80 IF HUMAN\$="SCISSORS" THEN GOTO 100
90 PRINT "INVALID GUESS. TRY AGAIN.": GOTO 50
100 PRINT "YOU CHOSE "HUMAN\$" AND THE COMPUTER CHOSE "COMPUTER\$"."
110 IF HUMAN\$=COMPUTER\$ THEN PRINT "THOSE ARE THE SAME CHOICES";", SO YOU TIED."
120 IF HUMAN\$="ROCK" AND COMPUTER=2 THEN PRINT "PAPER COVERS ROCK, SO YOU LOSE."
130 IF HUMAN\$="ROCK" AND COMPUTER=3 THEN PRINT "ROCK BLUNTS SCISSORS";", SO YOU WIN."
140 IF HUMAN\$="PAPER" AND COMPUTER=1 THEN PRINT "PAPER COVERS ROCK, SO YOU WIN."
150 IF HUMAN\$="PAPER" AND COMPUTER=3 THEN PRINT "SCISSORS CUT PAPER";", SO YOU LOSE."
160 IF HUMAN\$="SCISSORS" AND COMPUTER=1 THEN PRINT "ROCK BLUNTS SCISSORS";", SO YOU LOSE."
170 IF HUMAN\$="SCISSORS" AND COMPUTER=2 THEN PRINT "SCISSORS CUT PAPER, SO YOU WIN."10 COMPUTER=RND(3)+1```

## OCaml

```let pf = Printf.printf ;;

let looses a b = match a, b with
`R, `P -> true
| `P, `S -> true
| `S, `R -> true
|  _,  _ -> false ;;

let rec get_move () =
pf "[R]ock, [P]aper, [S]cisors [Q]uit? " ;
"P" -> `P
| "S" -> `S
| "R" -> `R
| "Q" -> exit 0
| _   -> get_move () ;;

let str_of_move = function
`P -> "paper"
| `R -> "rock"
| `S -> "scisors" ;;

let comp_move r p s =
let tot = r +. p +. s in
let n = Random.float 1.0 in
if n < r /. tot then
`R
else
if n < (r +. p) /. tot then
`P
else
`S ;;

let rec make_moves r p s =
let cm = comp_move r p s in   (* Computer move is based on game history. *)
let hm = get_move () in       (* Human move is requested. *)
pf "Me: %s. You: %s. " (str_of_move cm) (str_of_move hm);
let outcome =
if looses hm cm then
"I win. You loose.\n"
else if cm = hm then
"We draw.\n"
else
"You win. I loose.\n"
in pf "%s" outcome;
match hm with (* Play on with adapted strategy. *)
`S -> make_moves (r +. 1.) p s
| `R -> make_moves r (p +. 1.) s
| `P -> make_moves r p (s +. 1.) ;;

(* Main loop. *)
make_moves 1. 1. 1. ;;
```

## PARI/GP

```contest(rounds)={
my(v=[1,1,1],wins,losses); \\ Laplace rule
for(i=1,rounds,
my(computer,player,t);
t=random(v+v+v);
if(t<v, computer = "R",
if(t<v+v, computer = "P", computer = "S")
);
print("Rock, paper, or scissors?");
t = Str(input());
if(#t,
player=Vec(t);
if(player <> "R" && player <> "P", player = "S")
,
player = "S"
);
if (player == "R", v++);
if (player == "P", v++);
if (player == "S", v++);
print1(player" vs. "computer": ");
if (computer <> player,
if((computer == "R" && player = "P") || (computer == "P" && player = "S") || (computer == "S" && player == "R"),
print("You win");
losses++
,
print("I win");
wins++
)
,
print("Tie");
)
);
[wins,losses]
};
contest(10)```

## Perl

The program supports "--quiet" option, which makes it suppress all in-game output (useful for batch testing). At the end of a game it displays detailed statistics.

```use 5.012;
use warnings;
use utf8;
use open qw(:encoding(utf-8) :std);
use Getopt::Long;

package Game {
use List::Util qw(shuffle first);

my \$turns        = 0;
my %human_choice = ( rock => 0, paper => 0, scissors => 0, );
my %comp_choice  = ( rock => 0, paper => 0, scissors => 0, );
my %what_beats =
( rock => 'paper', paper => 'scissors', scissors => 'rock', );
my \$comp_wins  = 0;
my \$human_wins = 0;
my \$draws      = 0;

sub save_human_choice {
my \$ch = lc pop;
if ( exists \$human_choice{ \$ch } ) {
++\$human_choice{ \$ch };
}
else {
die __PACKAGE__ . ":: wrong choice: '\$ch'";
}
}

sub get_comp_choice {
my @keys = shuffle keys %human_choice;
my \$ch;
my ( \$prob, \$rand ) = ( 0, rand );
\$ch = ( first { \$rand <= ( \$prob += ( \$human_choice{ \$_ } / \$turns ) ) } @keys )
if \$turns > 0;
\$ch //= \$keys;
\$ch = \$what_beats{ \$ch };
++\$comp_choice{ \$ch };
return \$ch;
}

sub make_turn {
my ( \$comp_ch, \$human_ch ) = ( pop(), pop() );
++\$turns;
if ( \$what_beats{ \$human_ch } eq \$comp_ch ) {
++\$comp_wins;
return 'I win!';
}
elsif ( \$what_beats{ \$comp_ch } eq \$human_ch ) {
++\$human_wins;
return 'You win!';
}
else {
++\$draws;
return 'Draw!';
}
}

sub get_final_report {
my \$report =
"You chose:\n"
. "  rock     = \$human_choice{rock} times,\n"
. "  paper    = \$human_choice{paper} times,\n"
. "  scissors = \$human_choice{scissors} times,\n"
. "I chose:\n"
. "  rock     = \$comp_choice{rock} times,\n"
. "  paper    = \$comp_choice{paper} times,\n"
. "  scissors = \$comp_choice{scissors} times,\n"
. "Turns: \$turns\n"
. "I won: \$comp_wins, you won: \$human_wins, draws: \$draws\n";
return \$report;
}
}

sub main {
GetOptions( 'quiet' => \my \$quiet );
greet() if !\$quiet;
while (1) {
print_next_line() if !\$quiet;
my \$input = get_input();
last unless \$input;
if ( \$input eq 'error' ) {
print "I don't understand!\n" if !\$quiet;
redo;
}
my \$comp_choice = Game::get_comp_choice();
Game::save_human_choice(\$input);
my \$result = Game::make_turn( \$input, \$comp_choice );
describe_turn_result( \$input, \$comp_choice, \$result )
if !\$quiet;
}
print Game::get_final_report();
}

sub greet {
print "Welcome to the Rock-Paper-Scissors game!\n"
. "Choose 'rock', 'paper' or 'scissors'\n"
. "Enter empty line or 'quit' to quit\n";
}

sub print_next_line {
}

sub get_input {
my \$input = <>;
print "\n" and return if !\$input;    # EOF
chomp \$input;
return if !\$input or \$input =~ m/\A \s* q/xi;
return
( \$input =~ m/\A \s* r/xi ) ? 'rock'
: ( \$input =~ m/\A \s* p/xi ) ? 'paper'
: ( \$input =~ m/\A \s* s/xi ) ? 'scissors'
:                               'error';
}

sub describe_turn_result {
my ( \$human_ch, \$comp_ch, \$result ) = @_;
print "You chose \u\$human_ch, I chose \u\$comp_ch. \$result\n";
}

main();
```

Example input can be generated as follows:

```perl -e '@c=qw(r p s); for(1..10000){ print \$c[ rand() < 0.75 ? 0 : int rand(2) + 1 ], "\n" }' | perl rps.pl --quiet
```

Output:

```You chose:
rock     = 7542 times,
paper    = 1204 times,
scissors = 1254 times,
I chose:
rock     = 1275 times,
paper    = 7460 times,
scissors = 1265 times,
Turns: 10000
I won: 5920, you won: 2012, draws: 2068

```

Example of an interactive session:

```Welcome to the Rock-Paper-Scissors game!
Choose 'rock', 'paper' or 'scissors'
Enter empty line or 'quit' to quit
You chose Scissors, I chose Paper. You win!
You chose Scissors, I chose Rock. I win!
You chose Scissors, I chose Rock. I win!
You chose Scissors, I chose Rock. I win!
You chose Scissors, I chose Rock. I win!
You chose Paper, I chose Rock. You win!
You chose Scissors, I chose Rock. I win!
You chose:
rock     = 0 times,
paper    = 1 times,
scissors = 6 times,
I chose:
rock     = 6 times,
paper    = 1 times,
scissors = 0 times,
Turns: 7
I won: 5, you won: 2, draws: 0
```

## Phix

```--standard game
constant rule3 = {"rock blunts scissors",
"paper wraps rock",
"scissors cut paper"}
--extended version
constant rule5 = {"rock blunts scissors",
"rock crushes lizard",
"paper wraps rock",
"paper disproves spock",
"scissors cut paper",
"scissors decapitate lizard",
"lizard eats paper",
"lizard poisons spock",
"spock smashes scissors",
"spock vaporizes rock"}

constant rules = iff(rand(2)=1?rule3:rule5)

sequence what = {}
sequence beats = {}
string wkeys = ""
string question = "What is your move "
integer choices, hsum
sequence history, cplays, pplays

object x, verb, y

for i=1 to length(rules) do
{x} = split(rules[i])
if not find(x,what) then
what = append(what,x)
if find(x,wkeys) then
wkeys = append(wkeys,x[\$])
question &= x[1..-2]&"("&x[\$]&"), "
else
wkeys = append(wkeys,x)
question &= "("&x&")"&x[2..\$]&", "
end if
end if
end for
choices = length(wkeys)
history = repeat(1,choices)
hsum = 3
cplays = repeat(0,choices)
pplays = repeat(0,choices)
beats = repeat(repeat(0,choices),choices)
question[-2] = '?'
for i=1 to length(rules) do
{x,verb,y} = split(rules[i])
beats[find(x,what)][find(y,what)] = verb
end for

integer cmove, pmove, draws = 0, pwins = 0, cwins = 0
while 1 do
cmove = rand(hsum)
for i=1 to choices do
cmove -= history[i]
if cmove<=0 then
-- predicted user choice of i, find whatever beats it
for j=1 to choices do
if string(beats[j][i]) then
cmove = j
exit
end if
end for
exit
end if
end for
puts(1,question)
while 1 do
pmove = lower(wait_key())
if pmove='q' then exit end if
pmove = find(pmove,wkeys)
if pmove!=0 then exit end if
end while
if pmove='q' then exit end if

printf(1,"you: %s, me: %s, ",{what[pmove],what[cmove]})
cplays[cmove] += 1
pplays[pmove] += 1
if cmove=pmove then
printf(1,"a draw.\n")
draws += 1
else
if string(beats[cmove][pmove]) then
printf(1,"%s %s %s. I win.\n",{what[cmove],beats[cmove][pmove],what[pmove]})
cwins += 1
elsif string(beats[pmove][cmove]) then
printf(1,"%s %s %s. You win.\n",{what[pmove],beats[pmove][cmove],what[cmove]})
pwins += 1
else
?9/0    -- sanity check
end if
end if
history[pmove] += 1
hsum += 1
end while
printf(1,"       ") for i=1 to choices do   printf(1,"%9s",what[i])     end for
printf(1,"\nyou: ") for i=1 to choices do   printf(1,"%9d",pplays[i])   end for
printf(1,"\n me: ") for i=1 to choices do   printf(1,"%9d",cplays[i])   end for```
Output:
```What is your move (r)ock, (p)aper, (s)cissors? you: rock, me: scissors, rock blunts scissors. You win.
What is your move (r)ock, (p)aper, (s)cissors? you: rock, me: rock, a draw.
What is your move (r)ock, (p)aper, (s)cissors? you: rock, me: paper, paper wraps rock. I win.
What is your move (r)ock, (p)aper, (s)cissors? you: rock, me: rock, a draw.
What is your move (r)ock, (p)aper, (s)cissors? you: rock, me: paper, paper wraps rock. I win.
What is your move (r)ock, (p)aper, (s)cissors? you: rock, me: paper, paper wraps rock. I win.
What is your move (r)ock, (p)aper, (s)cissors? you: rock, me: paper, paper wraps rock. I win.
What is your move (r)ock, (p)aper, (s)cissors? you: rock, me: paper, paper wraps rock. I win.
What is your move (r)ock, (p)aper, (s)cissors? you: rock, me: paper, paper wraps rock. I win.
What is your move (r)ock, (p)aper, (s)cissors? you: rock, me: paper, paper wraps rock. I win.
What is your move (r)ock, (p)aper, (s)cissors?

rock    paper scissors
you:        10        0        0
me:         2        7        1
```

## Phixmonti

```include ..\Utilitys.pmt

0 var wh
0 var wc

( "Scissors cuts Paper"
"Paper covers Rock"
"Rock crushes Lizard"
"Lizard poisons Spock"
"Spock smashes Scissors"
"Scissors decapites Lizard"
"Lizard eats Paper"
"Paper disproves Spock"
"Spock vaporizes Rock"
"Rock blunts Scissors" )

"'Rock, Paper, Scissors, Lizard, Spock!' rules are: " ? nl
len for
get ?
endfor
nl

( ( "S" "Scissors" ) ( "P" "Paper" ) ( "R" "Rock" ) ( "L" "Lizard" ) ( "K" "Spock" ) )

true while
"Choose (S)cissors, (P)paper, (R)ock, (L)izard, Spoc(K) or (Q)uit: " input nl upper
dup "Q" == if
nl drop false
else
getd if
dup "You choose " print ? var he
rand 5 * int 1 + 2 2 tolist sget
dup "I choose " print ? var ce
he ce == if
"Draw" ?
else
swap len for
get dup
split 2 del
he ce 2 tolist
over over == rot rot reverse == or if exitfor else drop endif
endfor
dup ?
he find 1 == if wh 1 + var wh "You win!" else wc 1 + var wc "I win!" endif ? drop
swap
endif
else
print " is a invalid input!" ?
endif
true
endif
endwhile
drop drop
"Your punctuation: " print wh ?
"Mi punctuation: " print wc ?
wh wc > if "You win!" else wh wc < if "I win!" else "Draw!" endif endif ?```
Output:
```'Rock, Paper, Scissors, Lizard, Spock!' rules are:

Scissors cuts Paper
Paper covers Rock
Rock crushes Lizard
Lizard poisons Spock
Spock smashes Scissors
Scissors decapites Lizard
Lizard eats Paper
Paper disproves Spock
Spock vaporizes Rock
Rock blunts Scissors

Choose (S)cissors, (P)paper, (R)ock, (L)izard, Spoc(K) or (Q)uit: k
You choose Spock
I choose Rock
Spock vaporizes Rock
You win!
Choose (S)cissors, (P)paper, (R)ock, (L)izard, Spoc(K) or (Q)uit: q

Mi punctuation: 0
You win!

=== Press any key to exit ===```

## PHP

Use the url bar to play

e.g: www.example.com/rockpaper.php?moves=paper
www.example.com/rockpaper.php?moves=rock

```<?php
echo "<h1>" . "Choose: ROCK - PAPER - SCISSORS" . "</h1>";
echo "<h2>";
echo "";

\$player = strtoupper( \$_GET["moves"] );
\$wins = [
'ROCK' => 'SCISSORS',
'PAPER' => 'ROCK',
'SCISSORS' => 'PAPER'
];
\$a_i = array_rand(\$wins);
echo "<br>";
echo "Player chooses " . "<i style=\"color:blue\">" . \$player . "</i>";
echo "<br>";
echo "<br>" . "A.I chooses " . "<i style=\"color:red\">"  . \$a_i . "</i>";

\$results = "";
if (\$player == \$a_i){
\$results = "Draw";
} else if(\$wins[\$a_i] == \$player ){
\$results = "A.I wins";
} else {
\$results = "Player wins";
}

echo "<br>" . \$results;
?>
```

## Picat

Translation of: Prolog

(Some part is from the Prolog version.)

```go ?=>
println("\nEnd terms with '.'.\n'quit.' ends the session.\n"),
Prev = findall(P,beats(P,_)),
ChoiceMap = new_map([P=0 : P in Prev]),
ResultMap = new_map([computer_wins=0,user_wins=0,draw=0]),
play(Prev,ChoiceMap,ResultMap),
nl,
println("Summary:"),
println(choiceMap=ChoiceMap),
println(resultMap=ResultMap),
nl.

go => true.

%
% Play an interactive game.
%
play(Prev,ChoiceMap,ResultMap) =>
if P == quit then
nl,
print_result(ResultMap)
else
C = choice(ChoiceMap),
printf("The computer chose %w%n", C),
result(C,P,Prev,Next,Result),
ChoiceMap.put(P,ChoiceMap.get(P)+1),
ResultMap.put(Result,ResultMap.get(Result,0)+1),
play(Next,ChoiceMap,ResultMap)
end.

%
% Do a weighted random choice based on the user's previous choices.
%
weighted_choice(Map) = Choice =>
Map2 = [(V+1)=K : K=V in Map].sort, % ensure that all choices can be made
% Prepare the probability matrix M
Total = sum([P : P=_ in Map2]),
Len = Map2.len,
M = new_array(Len,2),
T = new_list(Len),
foreach({I,P=C} in zip(1..Len,Map2))
if I == 1 then
M[I,1] := 1,
M[I,2] := P
else
M[I,1] := M[I-1,2]+1,
M[I,2] := M[I,1]+P-1
end,
T[I] := C
end,
M[Len,2] := Total,

% Pick a random number in 1..Total
R = random(1,Total),
Choice = _,
% Check were R match
foreach(I in 1..Len, var(Choice))
if M[I,1] <= R, M[I,2] >= R then
Choice := T[I]
end
end.

%
% Check probably best counter choice.
%
choice(Map) = Choice =>
% what is the Player's probably choice
PlayersProbablyMove = weighted_choice(Map),
% select the choice that beats it
beats(Choice,PlayersProbablyMove).

print_result(ResultMap) =>
foreach(C in ResultMap.keys)
println(C=ResultMap.get(C))
end,
nl.

% This part is from the Prolog version.
result(C,P,R,[C|R],Result) :-
beats(C,P),
Result = computer_wins,
printf("Computer wins.\n").
result(C,P,R,[B|R],Result) :-
beats(P,C),
beats(B,P),
Result=user_wins,
printf("You win!%n").
result(C,C,R,[B|R],Result) :-
beats(B,C),
Result=draw,
printf("It is a draw\n").

beats(paper, rock).
beats(rock, scissors).
beats(scissors, paper).```

Sample result when user only plays rock.

Output:
```End terms with '.'.
'quit.' ends the session.

The computer chose paper
Computer wins.
The computer chose paper
Computer wins.
The computer chose paper
Computer wins.
The computer chose rock
It is a draw
The computer chose rock
It is a draw

computer_wins = 3
user_wins = 0
draw = 2

Summary:
choiceMap = (map)[rock = 5,paper = 0,scissors = 0]
resultMap = (map)[computer_wins = 3,user_wins = 0,draw = 2]```

## PicoLisp

```(use (C Mine Your)
(let (Rock 0  Paper 0  Scissors 0)
(loop
(setq Mine
(let N (if (gt0 (+ Rock Paper Scissors)) (rand 1 @) 0)
(seek
'((L) (le0 (dec 'N (caar L))))
'(Rock Paper Scissors .) ) ) )
(prin "Enter R, P or S to play, or Q to quit: ")
(loop
(and (= "Q" (prinl (setq C (uppc (key))))) (bye))
(T (setq Your (find '((S) (pre? C S)) '(Rock Paper Scissors))))
(prinl "Bad input - try again") )
(prinl
"I say " (cadr Mine) ", You say " Your ": "
(cond
((== Your (car Mine)) "I win")
(T "You win") ) )
(inc Your) ) ) )```

## PL/I

```rock: procedure options (main);   /* 30 October 2013 */
declare move character (1), cm fixed binary;

put ('The Rock-Paper-Scissors game');
put skip list ("please type 'r' for rock, 'p' for paper, 's' for scissors.");
put skip list ("Anything else finishes:");
do forever;
get edit (move) (a(1));
move = lowercase(move);
if index('rpsq', move) = 0 then iterate;
if move = 'q' then stop;
cm = random()*3; /* computer moves: 0 = rock, 1 = paper, 2 = scissors */
select (cm);
when (0) select (move);
when ('r') put list ('rock and rock: A draw');
when ('p') put list ('paper beats rock: You win');
when ('s') put list ('rock breaks scissors: I win');
end;
when (1) select (move);
when ('r') put list ('paper beats rock: I win');
when ('p') put list ('paper and paper: A draw');
when ('s') put list ('scissors cut paper: You win');
end;
when (2) select (move);
when ('r') put list ('rock breaks scissors: You win');
when ('p') put list ('scissors cuts paper: I win');
when ('s') put list ('Scissors and Scissors: A draw');
end;
end;
end;
end rock;```

## Prolog

```play :-
findall(P,beats(P,_),Prev),
play(Prev).

play(Prev) :-
random_member(C, Prev),
format('The computer chose ~p~n', C),
result(C,P,Prev,Next),
!,
play(Next).

result(C,P,R,[C|R]) :-
beats(C,P),
format('Computer wins.~n').
result(C,P,R,[B|R]) :-
beats(P,C),
beats(B,P),
format('You win!~n').
result(C,C,R,[B|R]) :-
beats(B,C),
format('It is a draw~n').

beats(paper, rock).
beats(rock, scissors).
beats(scissors, paper).
```

## PureBasic

```Enumeration
;choices are in listed according to their cycle, weaker followed by stronger
#rock
#paper
#scissors
#numChoices ;this comes after all possible choices
EndEnumeration

;give names to each of the choices
Dim choices.s(#numChoices - 1)
choices(#rock) = "rock"
choices(#paper) = "paper"
choices(#scissors) = "scissors"

Define gameCount
Dim playerChoiceHistory(#numChoices - 1)

Procedure weightedRandomChoice()
Shared gameCount, playerChoiceHistory()
Protected x = Random(gameCount - 1), t, c

For i = 0 To #numChoices - 1
t + playerChoiceHistory(i)
If t >= x
c = i
Break
EndIf
Next

ProcedureReturn (c + 1) % #numChoices
EndProcedure

If OpenConsole()
PrintN("Welcome to the game of rock-paper-scissors")
PrintN("Each player guesses one of these three, and reveals it at the same time.")
PrintN("Rock blunts scissors, which cut paper, which wraps stone.")
PrintN("If both players choose the same, it is a draw!")
PrintN("When you've had enough, choose Q.")

Define computerChoice, playerChoice, response.s
Define playerWins, computerWins, draw, quit

computerChoice = Random(#numChoices - 1)
Repeat
Print(#CRLF\$ + "What is your move (press R, P, or S)?")
Repeat
response = LCase(Input())
Until FindString("rpsq", response) > 0

If response = "q":
quit = 1
Else
gameCount + 1
playerChoice = FindString("rps", response) - 1

result = (playerChoice - computerChoice + #numChoices) % #numChoices
Print("You chose " + choices(playerChoice) + " and I chose " + choices(computerChoice))
Select result
Case 0
PrintN(". It's a draw.")
draw + 1
Case 1
PrintN(". You win!")
playerWins + 1
Case 2
PrintN(". I win!")
computerWins + 1
EndSelect
playerChoiceHistory(playerChoice) + 1
computerChoice = weightedRandomChoice()
EndIf
Until quit

Print(#CRLF\$ + "You chose: ")
For i = 0 To #numChoices - 1
Print(choices(i) + " " + StrF(playerChoiceHistory(i) * 100 / gameCount, 1) + "%; ")
Next
PrintN("")
PrintN("You won " + Str(playerWins) + ", and I won " + Str(computerWins) + ". There were " + Str(draw) + " draws.")
PrintN("Thanks for playing!")

Print(#CRLF\$ + #CRLF\$ + "Press ENTER to exit"): Input()
CloseConsole()
EndIf
```

Sample output:

```Welcome to the game of rock-paper-scissors
Each player guesses one of these three, and reveals it at the same time.
Rock blunts scissors, which cut paper, which wraps stone.
If both players choose the same, it is a draw!
When you've had enough, choose Q.

What is your move (press R, P, or S)?r
You chose rock and I chose paper. I win!

What is your move (press R, P, or S)?r
You chose rock and I chose paper. I win!

What is your move (press R, P, or S)?r
You chose rock and I chose paper. I win!

What is your move (press R, P, or S)?r
You chose rock and I chose paper. I win!

What is your move (press R, P, or S)?r
You chose rock and I chose paper. I win!

What is your move (press R, P, or S)?s
You chose scissors and I chose paper. You win!

What is your move (press R, P, or S)?r
You chose rock and I chose paper. I win!

What is your move (press R, P, or S)?s
You chose scissors and I chose paper. You win!

What is your move (press R, P, or S)?s
You chose scissors and I chose paper. You win!

What is your move (press R, P, or S)?s
You chose scissors and I chose paper. You win!

What is your move (press R, P, or S)?s
You chose scissors and I chose rock. I win!

What is your move (press R, P, or S)?q

You chose: rock 54.5%; paper 0.0%; scissors 45.5%;
You won 4, and I won 7. There were 0 draws.
Thanks for playing!```

## Python

A light version with limited support for additional rules. New weapons can be introduced, but each can only be beaten by one other weapon.

The `rules` dictionary is of the form `'this': beaten by 'that', etc` as opposed to `'this': beats 'that'`.

```from random import choice

rules = {'rock': 'paper', 'scissors': 'rock', 'paper': 'scissors'}
previous = ['rock', 'paper', 'scissors']

while True:
human = input('\nchoose your weapon: ')
computer = rules[choice(previous)]  # choose the weapon which beats a randomly chosen weapon from "previous"

if human in ('quit', 'exit'): break

elif human in rules:
previous.append(human)
print('the computer played', computer, end='; ')

if rules[computer] == human:  # if what beats the computer's choice is the human's choice...
print('yay you win!')
elif rules[human] == computer:  # if what beats the human's choice is the computer's choice...
print('the computer beat you... :(')
else: print("it's a tie!")

else: print("that's not a valid choice")
```

Output, where player always chooses Rock:

```choose your weapon: rock
the computer played rock; it's a tie!

the computer played scissors; yay you win!

the computer played paper; the computer beat you... :(

the computer played paper; the computer beat you... :(

the computer played paper; the computer beat you... :(```

This is another code. Output is as same as the above output.

```from random import randint

hands = ['rock', 'scissors', 'paper']; judge = ['its a tie!', 'the computer beat you... :(', 'yay you win!']
while True:
try:
YOU = hands.index(input('Choose your weapon: ')) # YOU = hands.index(raw_input('Choose your weapon: '))   If you use Python2.7
except ValueError:
break
NPC = randint(0, 2)
print('The computer played ' + hands[NPC] + '; ' + judge[YOU-NPC])
```

## Quackery

```  [ 0 ]                                  is rock       (     --> n )
[ 1 ]                                  is paper      (     --> n )
[ 2 ]                                  is scissor    (     --> n )

[ \$ "Choose rock, paper or scissors: "
input cr
trim reverse trim reverse
\$ "" swap witheach [ lower join ]
dup \$ "rock"  = iff
[ drop rock ] done
dup \$ "paper" = iff
[ drop paper ] done
\$ "scissors"  = iff
scissor done
again ]                            is player     (     --> n )

[ stack 1 ]                            is rocks      (     --> s )
[ stack 1 ]                            is papers     (     --> s )
[ stack 1 ]                            is scissors   (     --> s )

[ 1 swap
[ table rocks papers scissors ]
do tally ]                           is notechoice (   n -->   )

[ 0 ' [ rocks papers scissors ]
witheach [ share + ]
random
dup rocks share < iff
[ drop paper ] done
rocks share -
papers share < iff
scissor done
rock ]                              is computer    (     --> n )

[ say "Computer chose "
[ table rock paper scissors ]
echo say "." cr ]                   is echomove    (   n -->   )

[ [ table
[ table 0 1 2 ]
[ table 2 0 1 ]
[ table 1 2 0 ] ] do ]            is result      ( n n --> n )

[ [ table
\$ "It's a draw."
\$ "Computer wins."
\$ "Player wins." ]
do echo\$ cr cr ]                    is announce    (   n -->   )

[ stack 0 ]                           is draws       (     --> s )
[ stack 0 ]                           is cwins       (     --> s )
[ stack 0 ]                           is pwins       (     --> s )

[ [ table draws cwins pwins ]
1 swap tally ]                      is keepscore   (   n -->   )

[ say "Computer: " cwins share echo
say "  Player: " pwins share echo
say "   Draws: " draws share echo
cr cr ]                             is scoreboard  (     -->   )

[ ' [ rocks papers scissors ]
witheach [ 1 swap replace ]
' [ draws cwins pwins ]
witheach [ 0 swap replace ] ]       is initialise  (     -->   )

[ 0
[ drop
\$ "How many games? " input
trim reverse trim reverse
\$->n until ]
cr ]                                is games       (     --> n )

[ initialise
games times
[ computer
player dup notechoice
over echomove
result dup announce
keepscore
scoreboard ] ]                  is play        (     -->   )```
Output:

As a dialogue in the Quackery shell.

```/O> play
...
How many games? 3

Choose rock, paper or scissors: rock

Computer chose rock.
It's a draw.

Computer: 0  Player: 0   Draws: 1

Choose rock, paper or scissors: paper

Computer chose scissors.
Computer wins.

Computer: 1  Player: 0   Draws: 1

Choose rock, paper or scissors: scissors

Computer chose paper.
Player wins.

Computer: 1  Player: 1   Draws: 1

Stack empty.

/O>```

## R

This milks R's vectorisation quite heavily. However, this approach doesn't generalise well to the extra credit task. In particular, the last two lines of the loop would need a lot of work to be both non-ugly and working.

```play <- function()
{
bias <- c(r = 1, p = 1, s = 1)
repeat
{
playerChoice <- readline(prompt = "Rock (r), Paper (p), Scissors (s), or Quit (q)? ")
if(playerChoice == "q") break
rps <- c(Rock = "r", Paper = "p", Scissors = "s")
if(!playerChoice %in% rps) next
compChoice <- sample(rps, 1, prob = bias / sum(bias))
cat("I choose", names(compChoice), "\n",
c("We draw!", "I win!", "I lose!")[1 + (which(compChoice == rps) - which(playerChoice == rps)) %% 3], "\n")
bias <- bias + (playerChoice == c("s", "r", "p"))
}
}
play()
```

## Racket

```#lang racket
(require math)

(define history (make-hash '((paper . 1) (scissors . 1) (rock . 1))))
(define total 3)

(define (update-history! human-choice)
(set! total (+ total 1))

(define (pick-one)
(sample
(discrete-dist '(paper scissors rock)
(map (λ (x) (hash-ref history x))
'(scissors paper rock)))))

(define (find-winner computer human)
(define order '(scissors paper rock scissors))
(cond
[(eq? computer human)                         'none]
[(eq? (second (member computer order)) human) 'computer]
[                                             'human]))

(define (game-loop)
(define computer-choice (pick-one))
(define winner (find-winner computer-choice human-choice))
(update-history! human-choice)
(displayln (~a "Computer picked " computer-choice ", "
"human picked " human-choice ", "
winner " wins."))
(game-loop))

(game-loop)
```

## Raku

(formerly Perl 6) This is slightly more complicated than it could be; it is a general case framework with input filtering. It weights the computers choices based on your previous choices. Type in at least the first two characters of your choice, or just hit enter to quit. Customize it by supplying your own %vs options/outcomes.

Here is standard Rock-Paper-Scissors.

```my %vs = (
options => [<Rock Paper Scissors>],
ro => {
ro => [ 2, ''                        ],
pa => [ 1, 'Paper covers Rock: '     ],
sc => [ 0, 'Rock smashes Scissors: ' ]
},
pa => {
ro => [ 0, 'Paper covers Rock: '    ],
pa => [ 2, ''                       ],
sc => [ 1, 'Scissors cut Paper: '   ]
},
sc => {
ro => [ 1, 'Rock smashes Scissors: '],
pa => [ 0, 'Scissors cut Paper: '   ],
sc => [ 2, ''                       ]
}
);

my %choices = %vs<options>.map({; \$_.substr(0,2).lc => \$_ });
my \$keys    = %choices.keys.join('|');
my \$prompt  = %vs<options>.map({\$_.subst(/(\w\w)/, -> \$/ {"[\$0]"})}).join(' ')~"? ";
my %weight  = %choices.keys »=>» 1;

my @stats = 0,0,0;
my \$round;

while my \$player = (prompt "Round {++\$round}: " ~ \$prompt).lc {
\$player.=substr(0,2);
say 'Invalid choice, try again.' and \$round-- and next
unless \$player.chars == 2 and \$player ~~ /<\$keys>/;
my \$computer = (flat %weight.keys.map( { \$_ xx %weight{\$_} } )).pick;
%weight{\$_.key}++ for %vs{\$player}.grep( { \$_.value == 1 } );
my \$result = %vs{\$player}{\$computer};
@stats[\$result]++;
say "You chose %choices{\$player},  Computer chose %choices{\$computer}.";
print %vs{\$player}{\$computer};
print ( 'You win!', 'You Lose!','Tie.' )[\$result];
say " - (W:{@stats} L:{@stats} T:{@stats})\n",
};
```
Example output:
```Round 1: [Ro]ck [Pa]per [Sc]issors? ro
You chose Rock,  Computer chose Paper.
Paper covers Rock: You Lose! - (W:0 L:1 T:0)

Round 2: [Ro]ck [Pa]per [Sc]issors? pa
You chose Paper,  Computer chose Scissors.
Scissors cut Paper: You Lose! - (W:0 L:2 T:0)

Round 3: [Ro]ck [Pa]per [Sc]issors? pa
You chose Paper,  Computer chose Scissors.
Scissors cut Paper: You Lose! - (W:0 L:3 T:0)

Round 4: [Ro]ck [Pa]per [Sc]issors? ro
You chose Rock,  Computer chose Rock.
Tie. - (W:0 L:3 T:1)

Round 5: [Ro]ck [Pa]per [Sc]issors? sc
You chose Scissors,  Computer chose Scissors.
Tie. - (W:0 L:3 T:2)
...```

Here is example output from the same code only with a different %vs data structure implementing Rock-Paper-Scissors-Lizard-Spock.

```my %vs = (
options => [<Rock Paper Scissors Lizard Spock>],
ro => {
ro => [ 2, ''                            ],
pa => [ 1, 'Paper covers Rock: '         ],
sc => [ 0, 'Rock smashes Scissors: '     ],
li => [ 0, 'Rock crushes Lizard: '       ],
sp => [ 1, 'Spock vaporizes Rock: '      ]
},
pa => {
ro => [ 0, 'Paper covers Rock: '         ],
pa => [ 2, ''                            ],
sc => [ 1, 'Scissors cut Paper: '        ],
li => [ 1, 'Lizard eats Paper: '         ],
sp => [ 0, 'Paper disproves Spock: '     ]
},
sc => {
ro => [ 1, 'Rock smashes Scissors: '     ],
pa => [ 0, 'Scissors cut Paper: '        ],
sc => [ 2, ''                            ],
li => [ 0, 'Scissors decapitate Lizard: '],
sp => [ 1, 'Spock smashes Scissors: '    ]
},
li => {
ro => [ 1, 'Rock crushes Lizard: '       ],
pa => [ 0, 'Lizard eats Paper: '         ],
sc => [ 1, 'Scissors decapitate Lizard: '],
li => [ 2, ''                            ],
sp => [ 0, 'Lizard poisons Spock: '      ]
},
sp => {
ro => [ 0, 'Spock vaporizes Rock: '      ],
pa => [ 1, 'Paper disproves Spock: '     ],
sc => [ 0, 'Spock smashes Scissors: '    ],
li => [ 1, 'Lizard poisons Spock: '      ],
sp => [ 2, ''                            ]
}
);
```
```Round 1: [Ro]ck [Pa]per [Sc]issors [Li]zard [Sp]ock? li
You chose Lizard,  Computer chose Scissors.
Scissors decapitate Lizard: You Lose! - (W:0 L:1 T:0)

Round 2: [Ro]ck [Pa]per [Sc]issors [Li]zard [Sp]ock? sp
You chose Spock,  Computer chose Paper.
Paper disproves Spock: You Lose! - (W:0 L:2 T:0)

Round 3: [Ro]ck [Pa]per [Sc]issors [Li]zard [Sp]ock? ro
You chose Rock,  Computer chose Lizard.
Rock crushes Lizard: You Win! - (W:1 L:2 T:0)

Round 4: [Ro]ck [Pa]per [Sc]issors [Li]zard [Sp]ock? ro
You chose Rock,  Computer chose Scissors.
Rock smashes Scissors: You win! - (W:2 L:2 T:0)

Round 5: [Ro]ck [Pa]per [Sc]issors [Li]zard [Sp]ock? li
You chose Lizard,  Computer chose Paper.
Lizard eats Paper: You win! - (W:3 L:2 T:0)
...```

## Rascal

```import Prelude;

rel[str, str] whatbeats = {<"Rock", "Scissors">, <"Scissors", "Paper">, <"Paper", "Rock">};

list[str] ComputerChoices = ["Rock", "Paper", "Scissors"];

str CheckWinner(a, b){
if(b == getOneFrom(whatbeats[a]))
return a;
elseif(a == getOneFrom(whatbeats[b]))
return b;
else return "Nobody";
}

public str RPS(human){
computer = getOneFrom(ComputerChoices);
x = if(human == "Rock") "Paper"; elseif(human == "Paper") "Scissors"; else "Rock";
ComputerChoices += x;
return "Computer played <computer>. <CheckWinner(human, computer)> wins!";
}```

Sample output:

```rascal>RPS("Rock")
str: "Computer played Rock. Nobody wins!"

rascal>RPS("Rock")
str: "Computer played Rock. Nobody wins!"

rascal>RPS("Rock")
str: "Computer played Scissors. Rock wins!"

rascal>RPS("Rock")
str: "Computer played Paper. Paper wins!"

rascal>RPS("Rock")
str: "Computer played Paper. Paper wins!"

rascal>RPS("Rock")
str: "Computer played Paper. Paper wins!"

rascal>RPS("Rock")
str: "Computer played Paper. Paper wins!"

rascal>RPS("Rock")
str: "Computer played Rock. Nobody wins!"

rascal>RPS("Rock")
str: "Computer played Paper. Paper wins!"

rascal>RPS("Rock")
str: "Computer played Paper. Paper wins!"```

## Red

```Red [Purpose: "Implement a rock-paper-scissors game with weighted probability"]

prior: rejoin choices: ["r" "p" "s"]

while [
find choices pchoice: ask "choose rock: r, paper: p, or scissors: s^/"
] [
print ["AI Draws:" cchoice: random/only prior]
cwin: select "rpsr" pchoice
close: select "rspr" pchoice

print case [
pchoice = cchoice ["tie"]
cchoice = cwin ["you lose"]
'else ["you win"]
]

append prior cwin		;adds what would have beaten player
remove find prior close		;removes what would have lost to player
]
```

## REXX

This REXX program version:

•   allows the human player to abbreviate their choice
•   issues appropriate error messages for an incorrect (or no) choice(s)
•   allows the human player to   QUIT   at any time
•   keeps track of the human player's responses   (to hopefully make future computer winning choices)
•   uses better "English"/grammer,     i.e.:       rock breaks scissors,       and       paper covers rock.
```/*REXX program plays rock─paper─scissors with a human;  tracks what human tends to use. */
!= '────────';  err=! "***error***";    @.=0     /*some constants for this program.     */
prompt= ! 'Please enter one of:     Rock   Paper   Scissors      (or Quit)'
\$.p= 'paper' ;  \$.s= "scissors";   \$.r= 'rock'   /*list of the choices in this program. */
t.p= \$.r     ;  t.s= \$.p       ;   t.r= \$.s      /*thingys that beats  stuff.           */
w.p= \$.s     ;  w.s= \$.r       ;   w.r= \$.p      /*stuff     "    "   thingys.          */
b.p= 'covers';  b.s= "cuts"    ;   b.r= 'breaks' /*verbs:   how the choice wins.        */

do forever;     say;      say prompt;     say  /*prompt the CBLF; then get a response.*/
c= word(\$.p \$.s \$.r,      random(1, 3) )       /*choose the computer's first pick.    */
m= max(@.r, @.p, @.s);    c= w.r               /*prepare to examine the choice history*/
if @.p==m  then c= w.p                         /*emulate JC's:  The Amazing Karnac.   */
if @.s==m  then c= w.s                         /*   "     "      "     "       "      */
c1= left(c, 1)                                 /*C1  is used for faster comparing.    */
parse pull u;             a= strip(u)          /*get the CBLF's choice/pick (answer). */
upper a c1  ;            a1= left(a, 1)        /*uppercase choices, get 1st character.*/
ok= 0                                          /*indicate answer isn't OK  (so far).  */
select                                    /*process/verify the  CBLF's  choice.  */
when words(u)==0           then           say  err   'nothing entered'
when words(u)>1            then say  err   'too many choices: '  u
when abbrev('QUIT',    a)  then do;  say ! "quitting.";      exit;    end
when abbrev('ROCK',    a) |,
abbrev('PAPER',   a) |,
abbrev('SCISSORS',a)  then ok=1      /*Yes?  This is a valid answer by CBLF.*/
otherwise                  say err  'you entered a bad choice: '    u
end   /*select*/

if \ok          then iterate                   /*answer ¬OK?  Then get another choice.*/
@.a1= @.a1 + 1                                 /*keep a history of the CBLF's choices.*/
say !  'computer chose: '    c
if   a1==  c1  then do;  say !  'draw.';   iterate;  end
if \$.a1==t.c1  then say  !  'the computer wins. '    !  \$.c1  b.c1  \$.a1
else say  !  'you win! '              !  \$.a1  b.a1  \$.c1
end   /*forever*/                              /*stick a fork in it,  we're all done. */
```
output   with various responses from the user   (output shown is a screen scraping):
```──────── Please enter one of:     Rock  Paper  Scissors      (or Quit)

s        ◄■■■■■■■■■■■■■■■ human input.
──────── computer chose:  rock
──────── the computer wins.  ──────── rock breaks scissors

──────── Please enter one of:     Rock  Paper  Scissors      (or Quit)

s        ◄■■■■■■■■■■■■■■■ human input.
──────── computer chose:  rock
──────── the computer wins.  ──────── rock breaks scissors

──────── Please enter one of:     Rock  Paper  Scissors      (or Quit)

s        ◄■■■■■■■■■■■■■■■ human input.
──────── computer chose:  rock
──────── the computer wins.  ──────── rock breaks scissors

──────── Please enter one of:     Rock  Paper  Scissors      (or Quit)

s        ◄■■■■■■■■■■■■■■■ human input.
──────── computer chose:  rock
──────── the computer wins.  ──────── rock breaks scissors

──────── Please enter one of:     Rock  Paper  Scissors      (or Quit)

s        ◄■■■■■■■■■■■■■■■ human input.
──────── computer chose:  rock
──────── the computer wins.  ──────── rock breaks scissors

──────── Please enter one of:     Rock  Paper  Scissors      (or Quit)

p        ◄■■■■■■■■■■■■■■■ human input.
──────── computer chose:  rock
──────── you win!  ──────── paper covers  rock

──────── Please enter one of:     Rock  Paper  Scissors      (or Quit)

q        ◄■■■■■■■■■■■■■■■ human input.
──────── quitting.
```

### extended, 5 choices

This REXX version supports more choices:   rock   paper   scissors   lizard   Spock

```/*REXX pgm plays rock─paper─scissors─lizard─Spock with human; tracks human usage trend. */
!= '────────';   err=! "***error***";    @.=0    /*some constants for this REXX program.*/
prompt=! 'Please enter one of:   Rock  Paper  SCissors  Lizard  SPock  (Vulcan)     (or Quit)'
\$.p='paper'           ; \$.s="scissors"        ; \$.r='rock'          ; \$.L="lizard"      ; \$.v='Spock'              /*names of the thingys*/
t.p= \$.r \$.v          ; t.s= \$.p \$.L          ; t.r= \$.s \$.L        ; t.L= \$.p \$.v      ; t.v= \$.r \$.s             /*thingys beats stuff.*/
w.p= \$.L \$.s          ; w.s= \$.v \$.r          ; w.r= \$.v \$.p        ; w.L= \$.r \$.s      ; w.v= \$.L \$.p             /*stuff beats thingys.*/
b.p='covers disproves'; b.s="cuts decapitates"; b.r='breaks crushes'; b.L="eats poisons"; b.v='vaporizes smashes'  /*how the choice wins.*/
whom.1= ! 'the computer wins. ' !;     whom.2= ! "you win! " !;       win= words(t. p)

do forever;   say;   say prompt;     say       /*prompt CBLF; then get a response.    */
c= word(\$.p \$.s \$.r \$.L \$.v, random(1, 5) )    /*the computer's first choice/pick.    */
m= max(@.r, @.p, @.s, @.L, @.v)                /*used in examining CBLF's history.    */
if @.p==m  then c= word(w.p, random(1, 2) )    /*emulate JC's  The Amazing Karnac.    */
if @.s==m  then c= word(w.s, random(1, 2) )    /*   "     "     "     "       "       */
if @.r==m  then c= word(w.r, random(1, 2) )    /*   "     "     "     "       "       */
if @.L==m  then c= word(w.L, random(1, 2) )    /*   "     "     "     "       "       */
if @.v==m  then c= word(w.v, random(1, 2) )    /*   "     "     "     "       "       */
c1= left(c, 1)                                 /*C1  is used for faster comparing.    */
parse pull u;            a= strip(u)           /*obtain the CBLF's choice/pick.       */
upper a c1  ;           a1= left(a, 1)         /*uppercase the choices, get 1st char. */
ok=0                                           /*indicate answer isn't  OK  (so far). */
select                                    /* [↓]  process the CBLF's choice/pick.*/
when words(u)==0               then say err    'nothing entered.'
when words(u)>1                then say err    'too many choices: '    u
when abbrev('QUIT',    a)      then do; say !  'quitting.';   exit;   end
when abbrev('LIZARD',  a)   |,
abbrev('ROCK',    a)   |,
abbrev('PAPER',   a)   |,
abbrev('VULCAN',  a)   |,
abbrev('SPOCK',   a,2) |,
abbrev('SCISSORS',a,2)    then ok=1  /*it's a valid choice for the human.   */
otherwise                  say err   'you entered a bad choice: '   u
end   /*select*/

if \ok          then iterate                   /*answer ¬OK?  Then get another choice.*/
@.a1= @.a1 + 1                                 /*keep a history of the CBLF's choices.*/
say ! 'computer chose: '  c
if a1==c1  then say !  'draw.'                 /*Oh rats!  The contest ended up a draw*/
else do who=1  for 2                /*either the computer or the CBLF won. */
if who==2  then parse value  a1 c1   with   c1 a1
do j=1  for win                                  /*see who won.  */
if \$.a1 \== word(t.c1, j)  then iterate          /*not this 'un. */
say whom.who  \$.c1  word(b.c1, j)  \$.a1          /*notify winner.*/
leave                                            /*leave  J loop.*/
end   /*j*/
end        /*who*/
end   /*forever*/                              /*stick a fork in it,  we're all done. */
```
output   is similar to the 1st REXX version.

## Ring

```# Project : Rock-paper-scissors

width 		= 200
height 		= 200

myChose 	= 1
compChose 	= 1
nextPlayer 	= 1
myScore 	= 0
compScore 	= 0
C_FONTSIZE 	= 15

C_ROCK 		= "images/rock.jpg"
C_PAPER 	= "images/paper.jpg"
C_SCISSORS 	= "images/scissors.jpg"

ChoseList 	= [C_ROCK,C_PAPER,C_SCISSORS]

Button 		= list(len(ChoseList))

app = new QApp
{

StyleFusion()

win = new QWidget() {

setWindowTitle('Stone Paper Scissors Game')
setWinIcon(self,C_ROCK)
setStyleSheet("background-color:cyan;")
setWindowFlags(Qt_Window | Qt_WindowTitleHint | Qt_WindowCloseButtonHint | Qt_CustomizeWindowHint)
reSize(900,600)
winheight 	= height()
fontSize	= 8 + (winheight / 100)

for Col = 1 to len(ChoseList)
Button[Col] = new QPushButton(win) {
x = 150+(Col-1)*height
setgeometry(x,35,width,height)
setStyleSheet("background-color:white;")
seticon(new qicon(new qpixmap(ChoseList[Col])))
setIconSize(new qSize(200,200))
setclickevent("ButtonPress(" + string(Col) + ")")
setSizePolicy(1,1)
}
next

labelMyChose = new QLabel(win) {
setgeometry(200,250,150,30)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
settext("My Chose:")
}

labelCompChose = new QLabel(win) {
setgeometry(580,250,150,30)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
settext("Comp Chose:")
}

labelScoreEnd = new QLabel(win) {
setgeometry(0,510,win.width(),30)
setAlignment(Qt_AlignHCenter | Qt_AlignVCenter)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
settext("")
}

btnMyChose = new QPushButton(win) {
setgeometry(150,300,width,height)
setStyleSheet("background-color:white;")
}

btnCompChose = new QPushButton(win) {
setgeometry(550,300,width,height)
setStyleSheet("background-color:white;")
}

btnNewGame = new QPushButton(win) {
setgeometry(170,550,150,40)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
setclickevent("NewGame()")
settext("New Game")
}

btnExit = new QPushButton(win) {
setgeometry(580,550,150,40)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
setclickevent("Close()")
settext("Exit")
}

labelMyScore = new QLabel(win) {
setgeometry(170,0,100,30)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
settext("My Score: ")
}

labelMyScoreSum = new QLabel(win) {
setgeometry(300,0,100,30)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
settext("")
}

labelCompScore = new QLabel(win) {
setgeometry(580,0,130,30)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
settext("Comp Score: ")
}

labelCompScoreSum = new QLabel(win) {
setgeometry(730,0,100,30)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
settext("")
}

show()

}

exec()

}

func ButtonPress Col

if nextPlayer = 1
myChose = Col
btnMyChose {
seticon(new qicon(new qpixmap(ChoseList[Col])))
setIconSize(new qSize(width,height))
}
nextPlayer = 2
compChose()
ok

func compChose

rndChose = random(len(ChoseList)-1) + 1
compChose = rndChose
btnCompChose {
seticon(new qicon(new qpixmap(ChoseList[compChose])))
setIconSize(new qSize(width,height))
}
nextPlayer = 1
Result()

func Result

if (myChose = compChose)
labelScoreEnd.settext("Draw!")
ok
if (myChose = 1) and (compChose = 2)
labelScoreEnd.settext("Computer Win!")
compScore = compScore + 1
labelCompScoreSum.settext(string(compScore))
ok
if (myChose = 1) and (compChose = 3)
labelScoreEnd.settext("I Win!")
myScore = myScore + 1
labelMyScoreSum.settext(string(myScore))
ok
if (myChose = 2) and (compChose = 3)
labelScoreEnd.settext("Computer Win!")
compScore = compScore + 1
labelCompScoreSum.settext(string(compScore))
ok
if (myChose = 2) and (compChose = 1)
labelScoreEnd.settext("I Win!")
myScore = myScore + 1
labelMyScoreSum.settext(string(myScore))
ok
if (myChose = 3) and (compChose = 1)
labelScoreEnd.settext("Computer Win!")
compScore = compScore + 1
labelCompScoreSum.settext(string(compScore))
ok
if (myChose = 3) and (compChose = 2)
labelScoreEnd.settext("I Win!")
myScore = myScore + 1
labelMyScoreSum.settext(string(myScore))
ok

func NewGame

nextPlayer 	= 1
myScore 	= 0
compScore 	= 0

btnMyChose {
seticon(new qicon(new qpixmap("")))
setIconSize(new qSize(200,200))
}

btnCompChose {
seticon(new qicon(new qpixmap("")))
setIconSize(new qSize(200,200))
}

labelScoreEnd.settext("")
labelMyScoreSum.settext("0")
labelCompScoreSum.settext("0")

func Close

win.close()
app.quit()```

## Ruby

```class RockPaperScissorsGame
CHOICES = %w[rock paper scissors quit]
BEATS = {
'rock'     => 'paper',
'paper'    => 'scissors',
'scissors' => 'rock',
}

def initialize()
@plays = {
'rock'     => 1,
'paper'    => 1,
'scissors' => 1,
}
@score = [0, 0, 0]          # :Human wins, :Computer wins, :draw

play
end

def humanPlay
loop do
return CHOICES[idx] if idx
end
end

def computerPlay
total = @plays.values.reduce(:+)
r = rand(total) + 1
sum = 0
CHOICES.each do |choice|
sum += @plays[choice]
return BEATS[choice] if r <= sum
end
end

def play
loop do
h = humanPlay
break if h == "quit"
c = computerPlay
print "H: #{h}, C: #{c} => "

# only update the human player's history after the computer has chosen
@plays[h] += 1

if h == c
puts "draw"
@score += 1
elsif h == BEATS[c]
puts "Human wins"
@score += 1
else
puts "Computer wins"
@score += 1
end
puts "score: human=%d, computer=%d, draw=%d" % [*@score]
end
@plays.each_key{|k| @plays[k] -= 1}
puts "\nhumans chose #{@plays}"
end
end

RockPaperScissorsGame.new
```

sample game where human always chooses rock:

```Your choice: ["rock", "paper", "scissors", "quit"]? r
H: rock, C: rock => draw
score: human=0, computer=0, draw=1

Your choice: ["rock", "paper", "scissors", "quit"]? r
H: rock, C: scissors => Human wins
score: human=1, computer=0, draw=1

Your choice: ["rock", "paper", "scissors", "quit"]? r
H: rock, C: paper => Computer wins
score: human=1, computer=1, draw=1

Your choice: ["rock", "paper", "scissors", "quit"]? r
H: rock, C: paper => Computer wins
score: human=1, computer=2, draw=1

Your choice: ["rock", "paper", "scissors", "quit"]? r
H: rock, C: paper => Computer wins
score: human=1, computer=3, draw=1

Your choice: ["rock", "paper", "scissors", "quit"]? r
H: rock, C: paper => Computer wins
score: human=1, computer=4, draw=1

Your choice: ["rock", "paper", "scissors", "quit"]? r
H: rock, C: paper => Computer wins
score: human=1, computer=5, draw=1

Your choice: ["rock", "paper", "scissors", "quit"]? r
H: rock, C: paper => Computer wins
score: human=1, computer=6, draw=1

Your choice: ["rock", "paper", "scissors", "quit"]? r
H: rock, C: rock => draw
score: human=1, computer=6, draw=2

Your choice: ["rock", "paper", "scissors", "quit"]? r
H: rock, C: paper => Computer wins
score: human=1, computer=7, draw=2

Your choice: ["rock", "paper", "scissors", "quit"]? q

humans chose {"rock"=>10, "paper"=>0, "scissors"=>0}
```

## Run BASIC

```pri\$ = "RSPR"
rps\$ = "Rock,Paper,Sissors"
[loop]
button #r, "Rock",    [r]
button #p, "Paper",   [p]
button #s, "Scissors",[s]
button #q, "Quit",    [q]
wait
[r] y = 1 :goto [me]
[p] y = 2 :goto [me]
[s] y = 3
[me]
cls
y\$ = word\$(rps\$,y,",")
m  = int((rnd(0) * 2) + 1)
m\$ = word\$(rps\$,m,",")
print chr\$(10);"You Chose:";y\$;" I chose:";m\$
yp = instr(pri\$,left\$(y\$,1))
mp = instr(pri\$,left\$(m\$,1))
if yp = 1 and mp = 3 then mp = 0
if mp = 1 and yp = 3 then yp = 0
if yp < mp then print "You win"
if yp = mp then print "Tie"
if yp > mp then print "I win"
goto [loop]
wait

[q] cls
print "Good Bye! I enjoyed the game"
end```

## Rust

```extern crate rand;
#[macro_use]
extern crate rand_derive;

use std::io;
use rand::Rng;
use Choice::*;

#[derive(PartialEq, Clone, Copy, Rand, Debug)]
enum Choice {
Rock,
Paper,
Scissors,
}

fn beats(c1: Choice, c2: Choice) -> bool {
(c1 == Rock && c2 == Scissors) || (c1 == Scissors && c2 == Paper) || (c1 == Paper && c2 == Rock)
}

fn ai_move<R: Rng>(rng: &mut R, v: [usize; 3]) -> Choice {
// weighted random choice, a dynamic version of `rand::distributions::WeightedChoice`
let rand = rng.gen_range(0, v + v + v);
if rand < v {
Paper
} else if rand < v + v {
Scissors
} else {
Rock
}
}

fn main() {

println!("Rock, paper, scissors!");
let mut ai_choice: Choice = rng.gen();
let mut ucf = [0, 0, 0]; // user choice frequency
let mut score = [0, 0];

loop {
println!("Please input your move: 'r', 'p' or 's'. Type 'q' to quit");

let mut input = String::new();
io::stdin()
let u_choice = match input.to_lowercase().trim() {
s if s.starts_with('r') => {
ucf += 1;
Rock
}
s if s.starts_with('p') => {
ucf += 1;
Paper
}
s if s.starts_with('s') => {
ucf += 1;
Scissors
}
s if s.starts_with('q') => break,
_ => {
continue;
}
};
println!("You chose {:?}, I chose {:?}.", u_choice, ai_choice);
if beats(u_choice, ai_choice) {
score += 1;
println!("You win!");
} else if u_choice == ai_choice {
println!("It's a tie!");
} else {
score += 1;
println!("I win!");
}
println!("-Score: You {}, Me {}", score, score);

// only after the 1st iteration the AI knows the stats and can make
// its weighted random move
ai_choice = ai_move(&mut rng, ucf);
}
println!("Thank you for the game!");
}
```

## Scala

You can invoke this game with an arbitrary number of weapons:

```object RockPaperScissors extends App {
def play(beats: LinkedHashMap[Symbol,Set[Symbol]], played: scala.collection.Map[Symbol,Int]) {
val h = readLine(s"""Your move (\${beats.keys mkString ", "}): """) match {
case null => println; return
case "" => return
case s => Symbol(s)
}
beats get h match {
case Some(losers) =>
def weighted(todo: Iterator[(Symbol,Int)], rand: Int, accum: Int = 0): Symbol = todo.next match {
case (s, i) if rand <= (accum + i) => s
case (_, i) => weighted(todo, rand, accum + i)
}
val c = weighted(played.toIterator, 1 + scala.util.Random.nextInt(played.values.sum)) match {
// choose an opponent that would beat the player's anticipated move
case h => beats.find{case (s, l) => l contains h}.getOrElse(beats.head)._1
}
print(s"  My move: \$c\n  ")
c match {
case c if losers contains c => println("You won")
case c if beats(c) contains h => println("You lost")
case _ => println("We drew") // or underspecified
}
case x => println("  Unknown weapon, try again.")
}
play(beats, played get h match {
case None => played
case Some(count) => played.updated(h, count + 1)
})
}

play(beats, beats.mapValues(_ => 1)) // init with uniform probabilities

'rock -> Set('lizard, 'scissors),
'paper -> Set('rock, 'spock),
'scissors -> Set('paper, 'lizard),
'lizard -> Set('spock, 'paper),
'spock -> Set('scissors, 'rock)
))
}
```
Output:
```Your move ('rock, 'paper, 'scissors, 'lizard, 'spock): paper
My move: 'paper
We drew
Your move ('rock, 'paper, 'scissors, 'lizard, 'spock): scissors
My move: 'paper
You won
Your move ('rock, 'paper, 'scissors, 'lizard, 'spock): rock
My move: 'scissors
You won
Your move ('rock, 'paper, 'scissors, 'lizard, 'spock): rock
My move: 'rock
We drew
Your move ('rock, 'paper, 'scissors, 'lizard, 'spock): rock
My move: 'paper
You lost
Your move ('rock, 'paper, 'scissors, 'lizard, 'spock): rock
My move: 'rock
We drew
Your move ('rock, 'paper, 'scissors, 'lizard, 'spock): rock
My move: 'paper
You lost
Your move ('rock, 'paper, 'scissors, 'lizard, 'spock): rock
My move: 'paper
You lost```

Here's another code: (I refactored the above code, it is more functional, more testable )

```object RockPaperScissors extends App {
def beats = Map(
'rock -> Set('lizard, 'scissors),
'paper -> Set('rock, 'spock),
'scissors -> Set('paper, 'lizard),
'lizard -> Set('spock, 'paper),
'spock -> Set('scissors, 'rock)
)
// init with uniform probabilities
def initPlayed = beats.mapValues(_ => 1)
def random(max: Int) = scala.util.Random.nextInt(max)
def display(text: String) = print(text)

def weighted(todo: Iterator[(Symbol,Int)], rand: Int, accum: Int = 0): Symbol = todo.next match {
case (s, i) if rand <= (accum + i) => s
case (_, i) => weighted(todo, rand, accum + i)
}

def calcMyMove(random: Int => Int, played: Map[Symbol,Int]) = {
weighted(played.toIterator, 1 + random(played.values.sum)) match {
// choose an opponent that would beat the player's anticipated move
case h => beats.find{case (s, l) => l contains h}.getOrElse(beats.head)._1
}
}

case class Result(text: String, won: Int, lost: Int, drew: Int) {
override def toString = s"\$text. Won: \$won, Lost: \$lost, Drew: \$drew"
}

def getResult(userWeapon: Symbol, myMove: Symbol, result: Result) = {
if (beats(userWeapon) contains myMove)
result.copy(text = "You won", won = result.won + 1)
else if (beats(myMove) contains userWeapon)
result.copy(text = "You lost", lost = result.lost + 1)
else result.copy(text = "We drew", drew = result.drew + 1)
}

def play(input: => Symbol, display: String => Unit, random: Int => Int)
(played: Map[Symbol,Int], result: Result): Result = {
val userWeapon = input
if (userWeapon != Symbol("")) {
val newResult = if (beats contains userWeapon) {
val myMove = calcMyMove(random, played)
display(s"  My move: \$myMove\n  ")
getResult(userWeapon, myMove, result)
} else {
result.copy(text = "  Unknown weapon, try again")
}
display(newResult + "\n")
play(input, display, random)(played get userWeapon match {
case None => played
case Some(count) => played.updated(userWeapon, count + 1)
}, newResult)
} else result
}

override def main(args: Array[String]): Unit =
play(input, display, random)(initPlayed, Result("Start", 0, 0, 0))
}
```
Output:
```Your move ('spock, 'rock, 'lizard, 'paper, 'scissors): rock
My move: 'rock
We drew. Won: 0, Lost: 0, Drew: 1
Your move ('spock, 'rock, 'lizard, 'paper, 'scissors): spock
My move: 'spock
We drew. Won: 0, Lost: 0, Drew: 2
Your move ('spock, 'rock, 'lizard, 'paper, 'scissors): lizard
My move: 'spock
You won. Won: 1, Lost: 0, Drew: 2
Your move ('spock, 'rock, 'lizard, 'paper, 'scissors): scissors
My move: 'spock
You lost. Won: 1, Lost: 1, Drew: 2
Your move ('spock, 'rock, 'lizard, 'paper, 'scissors): scissors
My move: 'spock
You lost. Won: 1, Lost: 2, Drew: 2
Your move ('spock, 'rock, 'lizard, 'paper, 'scissors): spock
My move: 'rock
You won. Won: 2, Lost: 2, Drew: 2```

## Seed7

The program reads the possible commands (1, 2, 3, q) as single keypresses from the KEYBOARD with getc. It is also possible to quit the program with q.

 This example is incorrect. Please fix the code and remove this message.Details: This example does not seem to use the weighted average AI from the task description.
```\$ include "seed7_05.s7i";
\$ include "keybd.s7i";

const array string: rockPaperScissors is [] ("Rock", "Paper", "Scissors");

const proc: main is func
local
var char: command is ' ';
var integer: user is 0;
var integer: comp is 0;
begin
writeln("Hello, Welcome to rock-paper-scissors");
repeat
write("Please type in 1 for Rock, 2 for Paper, 3 for Scissors, q to quit ");
flush(OUT);
repeat
command := lower(getc(KEYBOARD));
until command in {'1', '2', '3', 'q'};
writeln(command);
if command <> 'q' then
user := integer parse str(command);
comp := rand(1, 3);
writeln("You Played: " <& rockPaperScissors[user]);
writeln("Computer Played: " <& rockPaperScissors[comp]);
if comp = user then
writeln("You Tied");
elsif succ(comp) = user or user + 2 = comp then
writeln("Yay, You Won!");
else
writeln("Sorry, You Lost!");
end if;
end if;
until command = 'q';
writeln("Goodbye! Thanks for playing!");
end func;```

Sample run:

```Hello, Welcome to rock-paper-scissors
Please type in 1 for Rock, 2 for Paper, 3 for Scissors, q to quit 1
You Played: Rock
Computer Played: Scissors
Yay, You Won!
Please type in 1 for Rock, 2 for Paper, 3 for Scissors, q to quit 2
You Played: Paper
Computer Played: Scissors
Sorry, You Lost!
Please type in 1 for Rock, 2 for Paper, 3 for Scissors, q to quit 3
You Played: Scissors
Computer Played: Paper
Yay, You Won!
Please type in 1 for Rock, 2 for Paper, 3 for Scissors, q to quit q
Goodbye! Thanks for playing!
```

## Sidef

```const rps = %w(r p s)

const msg = [
"Rock breaks scissors",
"Paper covers rock",
"Scissors cut paper",
]

say <<"EOT"
\n>> Rock Paper Scissors <<\n
** Enter 'r', 'p', or 's' as your play.
** Enter 'q' to exit the game.
** Running score shown as <your wins>:<my wins>
EOT

var plays   = 0
var aScore  = 0
var pScore  = 0
var pcf     = [0,0,0]      # pcf = player choice frequency
var aChoice = pick(0..2)   # ai choice for first play is completely random

loop {
var pi = Sys.scanln("Play: ")
pi == 'q' && break

var pChoice = rps.index(pi)

if (pChoice == -1) {
STDERR.print("Invalid input!\n")
next
}

++pcf[pChoice]
++plays

# show result of play
">> My play: %-8s".printf(rps[aChoice])

given ((aChoice - pChoice + 3) % 3) {
when (0) { say "Tie." }
when (1) { "%-*s %s".printlnf(30, msg[aChoice], 'My point');   aScore++ }
when (2) { "%-*s %s".printlnf(30, msg[pChoice], 'Your point'); pScore++ }
}

# show score
"%-6s".printf("%d:%d" % (pScore, aScore))

# compute ai choice for next play
given (plays.rand.int) { |rn|
case (rn < pcf)        { aChoice = 1 }
case (pcf+pcf > rn) { aChoice = 2 }
default                   { aChoice = 0 }
}
}
```

Sample run:

```>> Rock Paper Scissors <<

** Enter 'r', 'p', or 's' as your play.
** Enter 'q' to exit the game.
** Running score shown as <your wins>:<my wins>

Play: r
>> My play: s       Rock breaks scissors           Your point
1:0   Play: p
>> My play: p       Tie.
1:0   Play: r
>> My play: s       Rock breaks scissors           Your point
2:0   Play: s
>> My play: p       Scissors cut paper             Your point
3:0   Play: r
>> My play: p       Paper covers rock              My point
3:1   Play: p
>> My play: r       Paper covers rock              Your point
4:1   Play: q
```

## SuperCollider

```// play it in the REPL, evaluating line by line

a = RockPaperScissors.new;
a.next(Scissors);
a.next(Scissors);
a.next(Scissors);
a.next(Paper);
```

An implementation using classes

```Rock {

*play { |other|
^other.rock + this + "against" + other
}

*rock {
^"tie"
}

*paper {
^"loses"
}

*scissors {
^"wins"
}

*losesAgainst {
^Paper
}

}

Paper {

*play { |other|
^other.paper + this + "against" + other
}

*paper {
^"tie"
}

*scissors {
^"loses"
}

*rock {
^"wins"
}

*losesAgainst {
^Scissors
}

}

Scissors {

*play { |other|
^other.scissors + this + "against" + other
}

*scissors {
^"tie"
}

*rock {
^"loses"
}

*paper {
^"wins"
}

*losesAgainst {
^Rock
}

}

RockPaperScissors {
var opponentMoves;

*new {
^super.new.init
}

init {
opponentMoves = Bag.new;
}

findBestMatch {
var typicalMove = opponentMoves.wchoose;
if(typicalMove.isNil) { ^[Rock, Paper, Scissors].choose };
^typicalMove.losesAgainst
}

next { |otherMove|
var myMove = this.findBestMatch;
^play(otherMove, myMove)
}

}
```

## Swift

```enum Choice: CaseIterable {
case rock
case paper
case scissors
case lizard
case spock
}

extension Choice {
var weaknesses: Set<Choice> {
switch self {
case .rock:
return [.paper, .spock]
case .paper:
return [.scissors, .lizard]
case .scissors:
return [.rock, .spock]
case .lizard:
return [.rock, .scissors]
case .spock:
return [.paper, .lizard]
}
}
}

struct Game {
private(set) var history: [(Choice, Choice)] = []
private(set) var p1Score: Int = 0
private(set) var p2Score: Int = 0

mutating func play(_ p1Choice: Choice, against p2Choice: Choice) {
history.append((p1Choice, p2Choice))
if p2Choice.weaknesses.contains(p1Choice) {
p1Score += 1
} else if p1Choice.weaknesses.contains(p2Choice) {
p2Score += 1
}
}
}

func aiChoice(for game: Game) -> Choice {
if let weightedWeekness = game.history.flatMap({ \$0.0.weaknesses }).randomElement() {
return weightedWeekness
} else {
// If history is empty, return random Choice
return Choice.allCases.randomElement()!
}
}

var game = Game()
print("Type your choice to play a round, or 'q' to quit")
loop: while true {
let choice: Choice
case "r", "rock":
choice = .rock
case "p", "paper":
choice = .paper
case "scissors":
choice = .scissors
case "l", "lizard":
choice = .lizard
case "spock":
choice = .spock
case "q", "quit", "exit":
break loop
case "s":
print("Do you mean Spock, or scissors?")
continue
default:
print("Unknown choice. Type 'q' to quit")
continue
}
let p2Choice = aiChoice(for: game)
print("You played \(choice) against \(p2Choice)")
game.play(choice, against: p2Choice)
print("Current score: \(game.p1Score) : \(game.p2Score)")
}
```

Sample run:

```Type your choice to play a round, or 'q' to quit
r
You played rock against paper
Current score: 0 : 1
Paper
You played paper against paper
Current score: 0 : 1
spock
You played spock against lizard
Current score: 0 : 2
lizard
You played lizard against paper
Current score: 1 : 2
q
```

## Tcl

```package require Tcl 8.5

### Choices are represented by integers, which are indices into this list:
###    Rock, Paper, Scissors
### Normally, idiomatic Tcl code uses names for these sorts of things, but it
### turns out that using integers simplifies the move-comparison logic.

# How to ask for a move from the human player
proc getHumanMove {} {
while 1 {
puts -nonewline "Your move? \[R\]ock, \[P\]aper, \[S\]cissors: "
flush stdout
gets stdin line
if {[eof stdin]} {
puts "\nBye!"
exit
}
set len [string length \$line]
foreach play {0 1 2} name {"rock" "paper" "scissors"} {
# Do a prefix comparison
if {\$len && [string equal -nocase -length \$len \$line \$name]} {
return \$play
}
}
puts "Sorry, I don't understand that. Try again please."
}
}

# How to ask for a move from the machine player
proc getMachineMove {} {
global states
set choice [expr {int(rand() * [::tcl::mathop::+ {*}\$states 3])}]
foreach play {1 2 0} count \$states {
if {[incr sum [expr {\$count+1}]] > \$choice} {
puts "I play \"[lindex {Rock Paper Scissors} \$play]\""
return \$play
}
}
}

# Initialize some state variables
set states {0 0 0}
set humanWins 0
set machineWins 0

# The main game loop
while 1 {
# Get the moves for this round
set machineMove [getMachineMove]
set humanMove [getHumanMove]
# Report on what happened
if {\$humanMove == \$machineMove} {
puts "A draw!"
} elseif {(\$humanMove+1)%3 == \$machineMove} {
puts "I win!"
incr machineWins
} else {
puts "You win!"
incr humanWins
}
puts "Cumulative scores: \$humanWins to you, \$machineWins to me"
# Update the state of how the human has played in the past
lset states \$humanMove [expr {[lindex \$states \$humanMove] + 1}]
}
```

Sample run:

```Your move? [R]ock, [P]aper, [S]cissors: rock
I play "Scissors"
You win!
Cumulative scores: 1 to you, 0 to me
Your move? [R]ock, [P]aper, [S]cissors: r
I play "Paper"
I win!
Cumulative scores: 1 to you, 1 to me
Your move? [R]ock, [P]aper, [S]cissors: s
I play "Paper"
You win!
Cumulative scores: 2 to you, 1 to me
Your move? [R]ock, [P]aper, [S]cissors: sciss
I play "Paper"
You win!
Cumulative scores: 3 to you, 1 to me
Your move? [R]ock, [P]aper, [S]cissors: p
I play "Paper"
A draw!
Cumulative scores: 3 to you, 1 to me
Your move? [R]ock, [P]aper, [S]cissors: zaphod beeblebrox
Sorry, I don't understand that. Try again please.
Your move? [R]ock, [P]aper, [S]cissors: r
I play "Scissors"
You win!
Cumulative scores: 4 to you, 1 to me
Your move? [R]ock, [P]aper, [S]cissors: ^D
Bye!
```

## TI-83 BASIC

```PROGRAM:RPS
:{0,0,0}→L1
:{0,0,0}→L2
:Lbl ST
:Disp "R/P/S"
:Disp "1/2/3"
:Lbl EC
:Input A
:If A>3 or A<1
:Then
:Goto NO
:End
:randInt(1,3+L1(1)+L1(2)+L1(3)→C
:If C≤1+L1(1)
:Then
:2→B
:Goto NS
:End
:If C>2+L1(2)
:Then
:1→B
:Else
:3→B
:End
:Lbl NS
:L1(A)+1→L1(A)
:If A=B
:Then
:Disp "TIE GAME"
:L2(3)+1→L2(3)
:Goto TG
:End
:If (A=1 and B=2) or (A=2 and B=3) or (A=3 and B=1)
:Then
:Disp "I WIN"
:L2(1)+1→L2(1)
:Else
:Disp "YOU WIN"
:L2(2)+1→L2(2)
:End
:Lbl TG
:Disp "PLAY AGAIN?"
:Input Str1
:If Str1="YES"
:Then
:ClrHome
:Goto ST
:Else
:Goto EN
:End
:Lbl NO
:ClrHome
:Pause "PICK 1,2, or 3"
:ClrHome
:Goto EC
:Lbl EN
:ClrHome
:Disp "I WON:"
:Disp L2(1)
:Disp "YOU WON:"
:Disp L2(2)
:Disp "WE TIED:"
:Disp L2(3)
:Disp "BYE"```

## TorqueScript

Rock Paper Scissors in TorqueScript:

```while(isobject(RockPaperScissors))
RockPaperScissors.delete();

new scriptObject(RockPaperScissors);

function RockPaperScissors::startGame(%this)
{
%this.idle = true;
echo("Starting rock paper scissors, please type choose(\"choice\"); to proceed!");
}

function RockPaperScissors::endGame(%this)
{
%this.idle = true;
}

function RockPaperScissors::main(%this)
{
%this.idle = 0;

if(getRandom(1,2) == 1)
{
%result = %this.getChoiceByUserFrequency();
}
else
{
%c = "rock";
%c = "paper";
%c = "scissors";

%result = %c[getRandom(0,2)];
}

%userChoice = %this.current;

%winner = thisVSthat(%userChoice,%result);

if(%winner == 0)
{
echo("You both chose "@%userChoice@", tie!");
}
else
if(%winner == 1)
{
echo("You chose "@%userChoice@" computer chose "@%result@", you win!");
}
else
if(%winner == 2)
{
echo("You chose "@%userChoice@" computer chose "@%result@", you lose!");
}

%this.idle = true;
}

function RockPaperScissors::getChoiceByUserFrequency(%this)
{
%weakness["rock"] = "paper";
%weakness["paper"] = "Scissors";
%weakness["scissors"] = "rock";

%a = %this.choice["rock"];
%a = %this.choice["paper"];
%a = %this.choice["Scissors"];

%b = "rock";
%b = "paper";
%b = "scissors";

for(%i=0;%i<3;%i++)
{
%curr = %a[%i];

if(%temp \$= "")
{
%temp = %curr;
%tempi = %i;
}
else
if(%curr > %temp)
{
%temp = %curr;
%tempi = %i;
}
}

return %weakness[%b[%tempi]];
}

function choose(%this)
{
%rps = rockPaperScissors;

if(!%rps.idle)
{
return 0;
}
else
if(%this !\$= "rock" && %this !\$= "paper" && %this !\$= "scissors")
{
return 0;
}

%rps.choice[%this]++;
%rps.current = %this;
%rps.main();

return %this;
}

function thisVSthat(%this,%that)
{
if(%this !\$= "rock" && %this !\$= "paper" && %this !\$= "scissors")
{
return 0;
}
else
if(%that !\$= "rock" && %that !\$= "paper" && %that !\$= "scissors")
{
return 0;
}

%weakness["rock"] = "paper";
%weakness["paper"] = "Scissors";
%weakness["scissors"] = "rock";

if(%weakness[%this] \$= %that)
{
%result = 2;
}
else
if(%weakness[%that] \$= %this)
{
%result = 1;
}
else
%result = 0;

return %result;
}```

To begin do:

`RockPaperScissors.startGame();`

Choose and play!

`choose("Rock");`

=> You chose rock computer chose paper, you lose!

## uBasic/4tH

This implementation uses a 6-bits binary scheme, where the lower three bits represent the choice of the user and the higher three bits the choice of the computer:

 This example is incorrect. Please fix the code and remove this message.Details: This example does not seem to use the weighted average AI from the task description.
``` 20 LET P=0: LET Q=0: LET Z=0
30 INPUT "Rock, paper, or scissors (1 = rock, 2 = paper, 3 = scissors)? ", A
40 IF A>3 THEN GOTO 400
50 IF A=3 THEN LET A=4
60 IF A<1 THEN GOTO 400
70 C=RND(3) : LET D=4: FOR B=1 TO C+1 : LET D = D+D : NEXT : GOTO (A+D)*10
90 Z=Z+1 : PRINT "We both chose 'rock'. It's a draw." : GOTO 30
100 P=P+1 : PRINT "You chose 'paper', I chose 'rock'. You win.." : GOTO 30
120 Q=Q+1 : PRINT "You chose 'scissors', I chose 'rock'. I win!" : GOTO 30
170 Q=Q+1 : PRINT "You chose 'rock', I chose 'paper'. I win!" : GOTO 30
180 Z=Z+1 : PRINT "We both chose 'paper'. It's a draw." : GOTO 30
200 P=P+1 : PRINT "You chose 'scissors', I chose 'paper'. You win.." : GOTO 30
330 P=P+1 : PRINT "You chose 'rock', I chose 'scissors'. You win.." : GOTO 30
340 Q=Q+1 : PRINT "You chose 'paper', I chose 'scissors'. I win!" : GOTO 30
360 Z=Z+1 : PRINT "We both chose 'scissors'. It's a draw." : GOTO 30
400 PRINT "There were ";Z;" draws. I lost ";P;" times, you lost ";Q;" times." : END
```

A sample game:

```Rock, paper, or scissors (1 = rock, 2 = paper, 3 = scissors)? 1
You chose 'rock', I chose 'paper'. I win!
Rock, paper, or scissors (1 = rock, 2 = paper, 3 = scissors)? 2
You chose 'paper', I chose 'scissors'. I win!
Rock, paper, or scissors (1 = rock, 2 = paper, 3 = scissors)? 3
You chose 'scissors', I chose 'paper'. You win..
Rock, paper, or scissors (1 = rock, 2 = paper, 3 = scissors)? 1
You chose 'rock', I chose 'paper'. I win!
Rock, paper, or scissors (1 = rock, 2 = paper, 3 = scissors)? 2
We both chose 'paper'. It's a draw.
Rock, paper, or scissors (1 = rock, 2 = paper, 3 = scissors)? 3
You chose 'scissors', I chose 'rock'. I win!
Rock, paper, or scissors (1 = rock, 2 = paper, 3 = scissors)? 4
There were 1 draws. I lost 1 times, you lost 4 times.
```

## UNIX Shell

Works with: Bourne Again Shell version 4
```#!/bin/bash
choices=(rock paper scissors)

# comparison function, works like Perl
# winner x y =  2 if y beats x, 1 if x beats 1, 0 if it's a tie
winner() {
local left="\$1" right="\$2"
echo \$(( (3 + left - right) % 3 ))
}

human_counts=(1 1 1)
human_count=3
computer_counts=(0 0 0)
games=0 human=0 computer=0

PS3="What do you throw? "
while true; do
select choice in rock paper scissors quit; do
if [ -z "\$choice" ]; then choice="\$REPLY"; fi
if [ "\$choice" = "quit" ]; then
break 2
fi
for (( h=0; h<\${#choices[@]}; ++h )); do
if [ "\${choices[h]}" = "\$choice" ]; then
break
fi
done
if (( h < 3 )); then
break
fi
echo "Unrecognized choice.  Try again!"
done

let n=RANDOM%human_count
for (( c=0; c<\${#human_counts[@]}; ++c )); do
let n-=\${human_counts[c]}
if (( n < 0 )); then
break
fi
done
let computer_counts[c]+=1
echo
echo "You chose \${choices[h]^^}"
echo "I chose \${choices[c]^^}"
w="\$(winner "\$c" "\$h")"
case "\$w" in
2) echo "YOU WIN!"; let human+=1;;
0) echo "TIE!";;
1) echo "I WIN!"; let computer+=1;;
*) echo "winner returned weird result '\$w'";;
esac
echo
let games+=1
(( human_counts[(h+1)%3]+=1, human_count+=1 ))
done

echo
echo "We played \$games games.  You won \$human, and I won \$computer."
for (( i=0; i<3; ++i )); do
echo "You picked \${choices[i]} \$(( human_counts[ (i+1)%3 ] - 1 )) times."
echo "I picked \${choices[i]} \$(( computer_counts[i] )) times."
done
```

## V (Vlang)

Semi-translation of Go version:

```import rand
import os

const (
rps = 'rps'
msg = [
'Rock breaks scissors',s
'Paper covers rock',
'Scissors cut paper'
]
)

fn main() {
println("Rock Paper Scissors")
println("Enter r, p, or s as your play.  Anything else ends the game.")
println("Running score shown as <your wins>:<my wins>")
mut pi :='' // player input
mut a_score, mut p_score  := 0, 0
mut pcf := []int{len: 2, init: 0} // pcf = player choice frequency
mut a_choice := rand.intn(3) or {0} // ai choice for first play is completely random
for _ in 0..6 {
// get player choice
pi = os.input('Play: ').str()
if typeof(pi).name != 'string' || pi.len != 1 {break}
p_choice := rps.index_any(pi)
if p_choice < 0 {break}
pcf << p_choice
// show result of play
println('My play: ' + rps[a_choice].ascii_str())
match (a_choice - p_choice + 3) % 3 {
0 {println("Tie.")}
1 {println('My point.\n' + msg[a_choice]) a_score++}
2 {println('Your point.\n' + msg[p_choice]) p_score++}
else {break}
}
// show score
println('\$p_score : \$a_score')
// compute ai choice for next play
rn := rand.intn(3) or {0}
match true {
rn < pcf {a_choice = 2}
rn < pcf + pcf {a_choice = 0}
else {a_choice = rand.intn(3) or {0}}
}
}
}```
Output:

Sample game:

```Rock Paper Scissors
Enter r, p, or s as your play.  Anything else ends the game.
Running score shown as <your wins>:<my wins>
Play: p
My play: s
My point.
Scissors cut paper
0 : 1
Play: r
My play: r
Tie.
0 : 1
Play: s
My play: p
Scissors cut paper
1 : 1
Play: p
My play: p
Tie.
1 : 1
Play: r
My play: p
My point.
Paper covers rock
1 : 2
Play: s
My play: r
My point.
Rock breaks scissors
1 : 3
```

## Wee Basic

Due to how the code works, any key has to be entered for the computer's choice to be generated.

```let entered=0
let keycode=0
let rcounter=1
print 1 "Enter R for rock, P for paper, or S for scissors. (not case sensitive)"
while entered=0
input human\$
if human=\$="r"
let human\$="rock"
let entered=1
elseif human=\$="R"
let human\$="rock"
let entered=1
elseif human=\$="p"
let human\$="paper"
let entered=1
elseif human=\$="P"
let human\$="paper"
let entered=1
elseif human=\$="s"
let human\$="scissors"
let entered=1
elseif human=\$="S"
let human\$="scissors"
let entered=1
elseif entered=0
print 1 "That choice is invalid."
endif
wend
print 1 "Press any key so the computer can make its choice."
while keycode=0
let rcounter=rcounter+1
let keycode=key()
if rcounter=4
let rcounter=1
endif
wend
if rcounter=1
let cpu\$="rock"
elseif rcounter=2
let cpu\$="paper"
elseif rcounter=3
let cpu\$="scissors"
endif
print 1 "You chose"+human\$+"."
print 1 "The computer chose"+cpu\$+"."
if human\$=cpu\$
print 1 "You tied."
endif
if human\$="rock"
if cpu\$="paper"
print 1 "Paper covers rock, so you lose."
endif
if cpu\$="scissors"
print 1 "Rock blunts scissors, so you win."
endif
endif
if human\$="paper"
if cpu\$="rock"
print 1 "Paper covers rock, so you win."
endif
if cpu\$="scissors"
print 1 "Scissors cut paper, so you lose."
endif
endif
if human\$="scissors"
if cpu\$="rock"
print 1 "Rock blunts scissors, so you lose."
endif
if cpu\$="paper"
print 1 "Scissors cut paper, so you win."
endif
endif
end```

## Wren

Translation of: Kotlin
Library: Wren-str
Library: Wren-ioutil
```import "random" for Random
import "/str" for Str
import "/ioutil" for Input

var choices = "rpsq"
var rand = Random.new()

var pWins  = 0          // player wins
var cWins  = 0          // computer wins
var draws  = 0          // neither wins
var games  = 0          // games played
var pFreqs = [0, 0, 0]  // player frequencies for each choice (rps)

var printScore = Fn.new {
System.print("Wins: You %(pWins), Computer %(cWins), Neither %(draws)\n")
}

var getComputerChoice = Fn.new {
// make a completely random choice until 3 games have been played
if (games < 3) return choices[rand.int(3)]
var num = rand.int(games)
return (num < pFreqs) ? "p" :
(num < pFreqs + pFreqs) ? "s" : "r"
}

System.print("Enter: (r)ock, (p)aper, (s)cissors or (q)uit\n")
while (true) {
printScore.call()
var pChoice = Str.lower(Input.option("Your choice r/p/s/q : ", "rpsqRPSQ"))
if (pChoice == "q") {
System.print("OK, quitting")
return
}
var cChoice = getComputerChoice.call()
System.print("Computer's choice   : %(cChoice)")
if (pChoice == "r" && cChoice == "s") {
System.print("Rock breaks scissors - You win!")
pWins = pWins + 1
} else if (pChoice == "p" && cChoice == "r") {
System.print("Paper covers rock - You win!")
pWins = pWins + 1
} else if (pChoice == "s" && cChoice == "p") {
System.print("Scissors cut paper - You win!")
pWins = pWins + 1
} else if (pChoice == "s" && cChoice == "r") {
System.print("Rock breaks scissors - Computer wins!")
cWins = cWins + 1
} else if (pChoice == "r" && cChoice == "p") {
System.print("Paper covers rock - Computer wins!")
cWins = cWins + 1
} else if (pChoice == "p" && cChoice == "s") {
System.print("Scissors cut paper - Computer wins!")
cWins = cWins + 1
} else {
System.print("It's a draw!")
draws = draws + 1
}
var pf = pFreqs[choices.indexOf(pChoice)]
pFreqs[choices.indexOf(pChoice)] = pf + 1
games = games + 1
System.print()
}
```
Output:

Sample game:

```Enter: (r)ock, (p)aper, (s)cissors or (q)uit

Wins: You 0, Computer 0, Neither 0

Computer's choice   : r
It's a draw!

Wins: You 0, Computer 0, Neither 1

Computer's choice   : s
Scissors cut paper - Computer wins!

Wins: You 0, Computer 1, Neither 1

Computer's choice   : p
Scissors cut paper - You win!

Wins: You 1, Computer 1, Neither 1

OK, quitting
```

## Yabasic

```REM Yabasic 2.763 version

WINNER = 1 : ACTION = 2 : LOSSER = 3
dim word\$(10, 3)

for n = 0 to 9
read word\$(n, WINNER), word\$(n, ACTION), word\$(n, LOSSER)
next n

repeat
clear screen
computerChoice\$ = word\$(ran(10), WINNER)
print "'Rock, Paper, Scissors, Lizard, Spock!' rules are:\n"
for n = 0 to 9
SimonSay(n)
next n
print "(R)ock, (P)aper, (S)cissors, (L)izard, Spoc(K), (Q)uit\n"
k\$ = upper\$(inkey\$)
if k\$ = "Q" break
switch k\$
case "R": humanChoice\$ = "Rock" : break
case "P": humanChoice\$ = "Paper" : break
case "S": humanChoice\$ = "Scissors" : break
case "L": humanChoice\$ = "Lizard" : break
case "K": humanChoice\$ = "Spock" : break
end switch
print "Player chose ", humanChoice\$, " and Computer chose ", computerChoice\$
for n = 0 to 9
if word\$(n, WINNER) = humanChoice\$ and word\$(n, LOSSER) = computerChoice\$ then
SimonSay(n)
print "Winner was Player"
wp = wp + 1
break
elseif word\$(n, WINNER) = computerChoice\$ and word\$(n, LOSSER) = humanChoice\$ then
SimonSay(n)
print "Winner was Computer"
wc = wc + 1
break
end if
next n
if n = 10 then
print "Ouch!"
end if
punctuation()
print "\nPress any key to continue"
inkey\$
until(k\$ = "Q")

punctuation()
if wp > wc then
print "Player win"
elseif wc > wp then
print "Computer win"
else
print "Tie"
end if

end

sub SimonSay(n)
print word\$(n, WINNER), " ", word\$(n, ACTION), " ", word\$(n, LOSSER)
end sub

sub punctuation()
print "\nPlayer = ", wp, "\tComputer = ", wc, "\n"
end sub

data "Scissors","cuts","Paper"
data "Paper","covers","Rock"
data "Rock","crushes","Lizard"
data "Lizard","poisons","Spock"
data "Spock","smashes","Scissors"
data "Scissors","decapites","Lizard"
data "Lizard","eats","Paper"
data "Paper","disproves","Spock"
data "Spock","vaporizes","Rock"
data "Rock","blunts","Scissors"```