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Rock-paper-scissors: Difference between revisions
Added Ada version
(Whups. buildPair was for an older revision of my code.) |
(Added Ada version) |
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For this task's AI player, keep track of the player's choice frequency, and use that choice frequency to make a [[Probabilistic choice|weighted random choice]] to beat the player's likely choice.
=={{header|Ada}}==
<lang Ada>with Ada.Text_IO; with Ada.Numerics.Float_Random;
procedure Rock_Paper_Scissors is
package Rand renames Ada.Numerics.Float_Random;
Gen: Rand.Generator;
type Choice is (Rock, Paper, Scissors);
Cnt: array (Choice) of Natural := (1, 1, 1);
-- pretend that each of R., P., and S., has been played once by the human
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
Ada.Text_IO.Put_Line(T);
Ada.Text_IO.Put_Line(U);
while not Done loop
Done := True;
declare
S: String := Ada.Text_IO.Get_Line;
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; -- computer choice made first
H := Human_Choice; -- now as 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;
Ada.Text_IO.Put_Line("COMPUTER'S CHOICE: " & Choice'Image(C)
& " RESULT: " & Result'Image(Res));
Ada.Text_IO.New_Line;
Score(Res) := Score(Res) + 1;
end loop;
exception
when Finish_The_Game =>
Ada.Text_IO.New_Line;
for R in Score'Range loop
Ada.Text_IO.Put_Line(Result'Image(R) & Natural'Image(Score(R)));
end loop;
end Rock_Paper_Scissors;</lang>
First and last few lines of the output of a game, where the human did permanently choose Rock:
<pre>./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</pre>
=={{header|Python}}==
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