# Nim game

(Redirected from Nim Game)

Nim game
You are encouraged to solve this task according to the task description, using any language you may know.

Nim is a simple game where the second player─if they know the trick─will always win.

The game has only 3 rules:

•   each player takes   1,  2,  or  3   tokens in turn
•  the player who takes the last token wins.

To win every time,   the second player simply takes 4 minus the number the first player took.   So if the first player takes 1,   the second takes 3; if the first player takes 2,   the second should take 2; and if the first player takes 3,   the second player will take 1.

Design a simple Nim game where the human player goes first, and the computer always wins. The game should enforce the rules.

## 11l

Translation of: Python
```V tokens = 12

F getTokens(curTokens) -> Void
print(‘How many tokens would you like to take? ’, end' ‘’)
V take = Int(input())

I (take < 1 | take > 3)
print("Number must be between 1 and 3.\n")
getTokens(curTokens)
R

:tokens = curTokens - take
print(‘You take #. tokens.’.format(take))
print("#. tokens remaining.\n".format(:tokens))

F compTurn(curTokens)
V take = curTokens % 4
:tokens = curTokens - take
print(‘Computer takes #. tokens.’.format(take))
print("#. tokens remaining.\n".format(:tokens))

L tokens > 0
getTokens(tokens)
compTurn(tokens)

print(‘Computer wins!’)```
Output:
```How many tokens would you like to take? 2
You take 2 tokens.
10 tokens remaining.

Computer takes 2 tokens.
8 tokens remaining.

How many tokens would you like to take? 1
You take 1 tokens.
7 tokens remaining.

Computer takes 3 tokens.
4 tokens remaining.

How many tokens would you like to take? 3
You take 3 tokens.
1 tokens remaining.

Computer takes 1 tokens.
0 tokens remaining.

Computer wins!
```

## 8080 Assembly

It may not be a very interesting game, but it assembles to only 222 bytes.

```bdos:		equ	5		; CP/M syscalls
puts:		equ	9
putch:		equ	2
getch:		equ	1

maxtokens:	equ	12		; you can change this for more tokens

org	100h
lxi	d,nim
call	outs
mvi	b,maxtokens	; 12 tokens
gameloop:	lxi	d,tokens	; Show tokens
call	outs
mov	c,b
showtokens:	dcr	c
jm	tokensdone
mvi	a,'|'
call	outa
jmp	showtokens
tokensdone:	lxi	d,nl
call	outs
lxi	d,prompt	; Show prompt
call	outs
sui	'1'		; Subtract '1' (lowest acceptable
jc	wrong		; input)
cpi	3		; range of values is [0..2]
jnc	wrong
cmp	b		; can't take more than there are either
jnc	wrong
cma			; negate; -a = ~(a-1)
mov	c,a		; keep value
add	b		; subtract from tokens
mov	b,a
mvi	a,4		; computer take 4-X tokens
mov	c,a
lxi	d,response	; print how many I take
call	outs
mvi	a,'0'
call	outa
mov	a,b		; subtract the ones I take
sub	c
jz	done		; if I took the last one, I won
mov	b,a
lxi	d,nl
call	outs
call	outs
jmp	gameloop
done:		lxi	d,lose		; there's no win condition
jmp	outs
;; Invalid input
wrong:		lxi	d,wronginp
call	outs
;; Read character into A and keep registers
ina:		push	b
push	d
push	h
mvi	c,getch
call	bdos
jmp	restore
;; Print A and keep registers
outa:		push	b
push	d
push	h
mvi	c,putch
mov	e,a
call	bdos
jmp	restore
;; Print string and keep registers
outs:		push	b
push	d
push	h
mvi	c,puts
call	bdos
;; Restore registers
restore:	pop	h
pop 	d
pop	b
ret
nim:		db	'Nim',13,10,13,10,'\$'
prompt:		db	'How many will you take (1-3)? \$'
response:	db	13,10,'I take \$'
tokens:		db	'Tokens: \$'
lose:		db	13,10,'You lose!\$'
nl:		db	13,10,'\$'
wronginp:	db	8,7,32,8,'\$'		; beep and erase choice```

## 8086 Assembly

Translation of: 8080 Assembly

This is a decent demonstration of the greater versatility of the 8086 when compared to the 8080. Where the 8080 only allowed complex operations on its `A` register, the other registers being limited to loading, incrementing and decrementing, the 8086 allows most operations to use any registers as its operands, leading to much shorter assembly code for the same program.

The trade-off is a more complex instruction encoding, usually requiring two bytes per instruction, minus any immediate operands. But that is ultimately worth it: whereas the 8080 version takes 222 bytes, this 8086 Nim assembles to only 173 bytes, mostly as a result of the three-instruction pattern of "load data into `A`, do something with it, then store it elsewhere" simplifying to just one instruction to manipulate the data in place.

```		;; MS-DOS Nim; assembles with nasm.
bits	16
cpu	8086
getch:		equ	1
putch:		equ	2
puts:		equ	9 		; INT 21h calls
maxtokens:	equ	12		; Amount of tokens there are
section		.text
org	100h
mov	dx,nim		; Print sign-on
call	outs
mov	ch,maxtokens	; CH = amount of tokens we have
loop:		mov	dx,tokens	; Tokens: |||...
call	outs
mov	ah,putch	; Print a | for each token
mov	dl,'|'
mov	dh,ch
puttoks:	int	21h
dec	dh
jnz	puttoks
mov	dx,prompt	; Ask the user how many to take
call	outs
int	21h
sub	al,'1'		; Make number (minus one)
inc	al		; Add 1 (because we subtracted '1')
cmp	al,3
cmp	al,ch
ja	bad		; If it was > amount left, it is bad
sub	ch,al		; Remove your tokens from pile
mov	cl,4		; I take 4-N, which is 3-N-1
sub	cl,al
sub	ch,cl		; Remove my tokens from pile
mov	dx,response	; Tell the user how many I took.
call	outs
mov	dl,'0'
mov	ah,putch
int	21h
cmp	ch,0		; Are there any tokens left?
jne	loop		; If not, prompt again
mov	dx,lose		; But otherwise, you've lost
; Fall through into print string routine and then stop.
;; Print string in DX. (This saves a byte each CALL)
outs:		mov	ah,puts
int	21h
ret
call	outs
section		.data
nim:		db	'Nim\$'
prompt:		db	13,10,'How many will you take (1-3)? \$'
response:	db	13,10,'I take \$'
tokens:		db	13,10,13,10,'Tokens: \$'
lose:		db	13,10,'You lose!\$'
wronginp:       db      8,7,32,8,'\$'
```

## Action!

```BYTE FUNC PlayerTurn(BYTE tokens)
BYTE t,max

IF tokens<3 THEN
max=tokens
ELSE
max=3
FI

DO
PrintF("How many tokens would you like to take (1-%B)? ",max)
t=InputB()
UNTIL t>=1 AND t<=max
OD
PrintF("Player takes %B tokens.%E",t)
t=tokens-t
IF t=0 THEN
PrintE("Player wins.")
FI
RETURN (t)

BYTE FUNC ComputerTurn(BYTE tokens)
BYTE t

t=tokens MOD 4
PrintF("Computer takes %B tokens.%E",t)
t=tokens-t
IF t=0 THEN
PrintE("Computer wins.")
FI
RETURN (t)

PROC Main()
BYTE tokens=[12],t
BYTE player=[1]

WHILE tokens>0
DO
PrintF("Available tokens: %B%E",tokens)
IF player THEN
tokens=PlayerTurn(tokens)
ELSE
tokens=ComputerTurn(tokens)
FI
player=1-player
OD
RETURN```
Output:
```Available tokens: 12
How many tokens would you like to take (1-3)? 3
Player takes 3 tokens.
Available tokens: 9
Computer takes 1 tokens.
Available tokens: 8
How many tokens would you like to take (1-3)? 2
Player takes 2 tokens.
Available tokens: 6
Computer takes 2 tokens.
Available tokens: 4
How many tokens would you like to take (1-3)? 1
Player takes 1 tokens.
Available tokens: 3
Computer takes 3 tokens.
Computer wins.
```

```with Ada.Text_IO;

procedure Nim is
subtype Token_Range is Positive range 1 .. 3;

package Token_IO is new TIO.Integer_IO(Token_Range);

procedure Get_Tokens(remaining : in Natural; how_many : out Token_Range) is
begin
loop
TIO.Put("How many tokens would you like to take? ");
begin
Token_IO.Get(TIO.Standard_Input, how_many);
exit when how_many < remaining;
raise Constraint_Error;
exception
when TIO.Data_Error | Constraint_Error =>
if not TIO.End_Of_Line(TIO.Standard_Input) then
TIO.Skip_Line(TIO.Standard_Input);
end if;
TIO.Put_Line("Invalid input.");
end;
end loop;
end;

tokens : Natural := 12;
how_many : Token_Range;
begin
loop
TIO.Put_Line(tokens'Img & " tokens remain.");
-- no exit condition here: human cannot win.
Get_Tokens(tokens, how_many);
TIO.Put_Line("Human takes" & how_many'Img & " tokens.");
tokens := tokens - how_many;
-- computer's turn: take the remaining N tokens to amount to 4.
how_many := tokens mod 4;
TIO.Put_Line("Computer takes" & how_many'Img & " tokens.");
tokens := tokens - how_many;
exit when tokens = 0;
end loop;

TIO.Put_Line("Computer won!");
end Nim;
```
Output:
``` 12 tokens remain.
How many tokens would you like to take? a
Invalid input.
How many tokens would you like to take? 1
Human takes 1 tokens.
Computer takes 3 tokens.

8 tokens remain.
How many tokens would you like to take? 2
Human takes 2 tokens.
Computer takes 2 tokens.

4 tokens remain.
How many tokens would you like to take? 3
Human takes 3 tokens.
Computer takes 1 tokens.

Computer won!
```

## ALGOL 68

```BEGIN # play Nim #
# gets a single character answer from standin and returns it #
PROC answer = ( STRING prompt )CHAR:
BEGIN
STRING s;
INT left := 0;
WHILE print( ( prompt, "> " ) );
read( ( s, newline ) );
left      := LWB s;
INT right := UPB s;
WHILE IF left  > right THEN FALSE ELSE s[ left  ] = " " FI DO left  +:= 1 OD;
WHILE IF right < left  THEN FALSE ELSE s[ right ] = " " FI DO right -:= 1 OD;
left /= right
DO
OD;
s[ left ]
# play one game #
INT    tokens := 12;
STRING suffix := "";
WHILE
CHAR  user;
WHILE user := answer( "There are "
+ whole( tokens, 0 )
+ " tokens"
+ suffix
+ ", how many do you want to take (1, 2 or 3)"
);
user /= "1" AND user /= "2" AND user /= "3"
DO
OD;
INT move = ABS user - ABS "0";
print( ( "I take ", whole( 4 - move, 0 ), newline ) );
suffix  := " left";
tokens -:= 4;
tokens > 0
DO SKIP OD;
print( ( "I win!", newline ) )
END```
Output:
```There are 12 tokens, how many do you want to take (1, 2 or 3)> 3
I take 1
There are 8 tokens left, how many do you want to take (1, 2 or 3)> t
There are 8 tokens left, how many do you want to take (1, 2 or 3)> 4
There are 8 tokens left, how many do you want to take (1, 2 or 3)> 1
I take 3
There are 4 tokens left, how many do you want to take (1, 2 or 3)> 2
I take 2
I win!
```

## ALGOL-M

```BEGIN

PROCEDURE WELCOME;
BEGIN
WRITE("THE GAME OF NIM");
WRITE("");
WRITE("WE BEGIN WITH 12 TOKENS. ON EACH TURN, A");
WRITE("PLAYER MAY TAKE BETWEEN 1 AND 3 TOKENS.");
WRITE("THE PLAYER WHO TAKES THE LAST TOKEN WINS.");
WRITE("");
END;

PROCEDURE SHOW(N);
INTEGER N;
BEGIN
WRITE("REMAINING TOKENS:",N);
END;

INTEGER FUNCTION GETNUM(LOWLIM, TOPLIM);
INTEGER LOWLIM, TOPLIM;
BEGIN
INTEGER OK, N;
OK := 0;
WHILE OK = 0 DO
BEGIN
WRITE("YOU TAKE:");
IF N < LOWLIM OR N > TOPLIM THEN
BEGIN
WRITE("MUST TAKE BETWEEN",LOWLIM," AND",TOPLIM,".");
WRITE("TRY AGAIN.");
END
ELSE
OK := 1;
END;
GETNUM := N;
END;

INTEGER FUNCTION PLAY(PLAYER, TOKENS, TAKEN);
INTEGER PLAYER, TOKENS, TAKEN;
BEGIN
IF PLAYER = 1 THEN      % HUMAN PLAYER'S MOVE %
TAKEN := GETNUM(1,3)
ELSE                    % MACHINE'S MOVE %
TAKEN := 4 - TAKEN;
PLAY := TAKEN;
END;

PROCEDURE REPORT(WINNER);
INTEGER WINNER; % MACHINE = 0, HUMAN = 1 %
BEGIN
IF WINNER = 0 THEN
WRITE("I TOOK THE LAST ONE, SO I WIN. SORRY ABOUT THAT.")
ELSE
WRITE("YOU TOOK THE LAST ONE. YOU WIN. CONGRATULATIONS!");
END;

% MAIN CODE BEGINS HERE %

INTEGER PLAYER, TOKENS, TAKEN, HUMAN, MACHINE;

MACHINE := 0;
HUMAN := 1;
TOKENS := 12;
TAKEN := 0;
PLAYER := HUMAN;
WELCOME;
WRITE("YOU GO FIRST.");
WHILE TOKENS > 0 DO
BEGIN
SHOW(TOKENS);
TAKEN := PLAY(PLAYER, TOKENS, TAKEN);
TOKENS := TOKENS - TAKEN;
IF PLAYER = MACHINE THEN WRITE("I TOOK:",TAKEN);
IF TOKENS > 0 THEN PLAYER := 1 - PLAYER;
END;
REPORT(PLAYER);
WRITE("THANKS FOR PLAYING!");

END```
Output:
```THE GAME OF NIM

WE BEGIN WITH 12 TOKENS. ON EACH TURN, A
PLAYER MAY TAKE BETWEEN 1 AND 3 TOKENS.
THE PLAYER WHO TAKES THE LAST TOKEN WINS.

YOU GO FIRST.
REMAINING TOKENS:    12
YOU TAKE:
-> 4
MUST TAKE BETWEEN     1 AND     3.
TRY AGAIN.
YOU TAKE:
-> 3
REMAINING TOKENS:     9
I TOOK:     1
REMAINING TOKENS:     8
YOU TAKE:
->2
REMAINING TOKENS:     6
I TOOK:     2
REMAINING TOKENS:     4
YOU TAKE:
-> 1
REMAINING TOKENS:     3
I TOOK:     3
I TOOK THE LAST ONE, SO I WIN. SORRY ABOUT THAT.
THANKS FOR PLAYING!
```

## Arturo

```total: 12
while ø [
tk: 0
while [not? contains? 1..3 tk: <= to :integer input "How many tokens will you take? (1-3) "][]
total: total-tk
print [total "tokens remaining\n"]

print ["COMPUTER's turn:"]
print ["taking:" 4-tk]
total: total-(4-tk)
print [total "tokens remaining\n"]
if total=0 [
print "COMPUTER won. :)"
break
]
]
```
Output:
```YOUR turn:
How many tokens will you take? (1-3) 3
9 tokens remaining

COMPUTER's turn:
taking: 1
8 tokens remaining

How many tokens will you take? (1-3) 2
6 tokens remaining

COMPUTER's turn:
taking: 2
4 tokens remaining

How many tokens will you take? (1-3) 1
3 tokens remaining

COMPUTER's turn:
taking: 3
0 tokens remaining

COMPUTER won. :)```

## AsciiDots

```%\$LMRTX
.-\$"Nim Dots"-\$""-

/\$_"Number must be "\
T                               /----~------\            |
*M                          /---+-*-[o]     |            |
R [-]\                        .>#3-+[>][<]-1#<.|            |
.-#12>--^ \"stod "\$-#_\$-" ekat uoY"_\$---/ \--*----*-/            |
.>\$_"How many dots would you like to take"---#?---/                   |
\X                                     X---------<".3 dna 1 neewteb"\$/
/-----*L                              |
[-]--\ R                               |
|   *-\$_"Computer takes "-\$_#-\$" dots"/
M-*#4[%]
\---/

/----------------\$"computer wins!"-&
/---~--
*#0[=]
L-------------*---*>\$_#-\$" dots remaining."-\$""
T```
Output:
```Nim Dots

How many dots would you like to take?: 3
You take 3 dots
9 dots remaining.

Computer takes 1 dots
8 dots remaining.

How many dots would you like to take?: 1
You take 1 dots
7 dots remaining.

Computer takes 3 dots
4 dots remaining.

How many dots would you like to take?: 2
You take 2 dots
2 dots remaining.

Computer takes 2 dots
0 dots remaining.

computer wins!
```

## AutoHotkey

```Play:
tokens := 12
while tokens {
while !(D>0 && D<4)
InputBox, D, Nim Game, % "Tokens Remaining = " tokens
. "`nHow many tokens would you like to take?"
. "`nChoose 1, 2 or 3"
tokens -= D
MsgBox % "Computer Takes " 4-D
tokens -= 4-d, d:=0
}
MsgBox, 262212,,Computer Always Wins!`nWould you like to play again?
IfMsgBox, Yes
gosub Play
else
ExitApp
return
```

## AWK

```# syntax: GAWK -f NIM_GAME.AWK
BEGIN {
tokens = 12
printf("Nim game - using %d tokens\n",tokens)
while (tokens > 0) {
for (;;) {
printf("how many tokens 1-3? ")
getline ans
if (ans ~ /^[123]\$/) {
tokens -= ans
prn("player")
break
}
print("invalid input, try again")
}
tokens -= ans = tokens % 4
prn("computer")
}
print("computer wins")
exit(0)
}
function prn(who) {
printf("%s takes %d token%s; there are %d remaining\n",who,ans,(ans==1)?"":"s",tokens)
}
```
Output:
```Nim game - using 12 tokens
how many tokens 1-3? 1
player takes 1 token; there are 11 remaining
computer takes 3 tokens; there are 8 remaining
how many tokens 1-3? 2
player takes 2 tokens; there are 6 remaining
computer takes 2 tokens; there are 4 remaining
how many tokens 1-3? 3
player takes 3 tokens; there are 1 remaining
computer takes 1 token; there are 0 remaining
computer wins
```

## BASIC

### Applesoft BASIC

This one-liner demonstrates the 240 character line limit. The program has been crafted to be exactly 244 characters long. The last 4 characters HEAP will be truncated from the last statement in the line. The HEAP variable is optional in the out-most NEXT statement so the program still runs correctly.

`0ST\$(0)="YOU MUST TAKE 1, 2, OR 3 TOKENS.":FORHEAP=12TO1STEP-4:PRINT"THERE ARE "HEAP" TOKENS REMAINING.":FORI=0TO1:INPUT"HOW MANY WOULD YOU LIKE TO TAKE?";T%:I=T%>0ANDT%<4:PRINTST\$(I):NEXTI:PRINT"ON MY TURN I WILL TAKE "4-T%" TOKENS.":NEXTHEAP`

### BASIC256

Works with: BASIC256 version 1.99.99.14+
```monton = 12
llevar = 0

while monton > 0
print "There are "; monton; " tokens remaining. How many would you like to take? ";
input integer llevar
while llevar = 0 or llevar > 3
print "You must take 1, 2, or 3 tokens. How many would you like to take ";
input integer llevar
end while

print "On my turn I will take "; 4 - llevar; " token(s)."
monton = monton - 4
end while

print
print "I got the last token. I win! Better luck next time."
end
```

### Chipmunk Basic

Translation of: FreeBASIC
Works with: Chipmunk Basic version 3.6.4
```100 cls
110 monton = 12
120 llevar = 0
130 do while monton > 0
140   print using "There are ## tokens remaining. How many would you like to take";monton;
150   input llevar
160   do while llevar = 0 or llevar > 3
170     input "You must take 1, 2, or 3 tokens. How many would you like to take";llevar
180   loop
190   print "On my turn I will take";4-llevar;" token(s)."
200   monton = monton-4
210 loop
220 print
230 print "I got the last token. I win! Better luck next time."
240 end
```

### Craft Basic

```let h = 12

label loop

alert "There are ", h ," tokens remaining."
input "How many would you like to take? ", t

if t > 3 or t < 1 then

alert "You must take between 1 to 3 tokens."

endif

if h - t < 0 then

alert "You cannot take that many. There's only ", h ," left."

endif

if t <= 3 and t >= 1 and h - t >= 0 then

let h = h - t

if h = 0 then

alert "Congratulations. You got the last token."
end

endif

let t = 4 - t

if h >= 15 then

let t = 3

endif

if h <= 3 then

let t = h

endif

alert "I will take ", t ," tokens."
let h = h - t

if h = 0 then

alert "I got the last token. I win. Better luck next time."
end

endif

endif

goto loop
```

### FreeBASIC

```dim as ubyte heap=12, take

while heap > 0
print using "There are ## tokens remaining. How many would you like to take?"; heap
input take
while take=0 orelse take>3
print "You must take 1, 2, or 3 tokens. How many would you like to take?"
input take
wend

print using "On my turn I will take ## tokens."; 4-take
heap = heap - 4
wend

print "I got the last token. I win! Better luck next time."```

### FTCBASIC

```define tokens = 12, take = 0

gosub intro

do

print "There are " \
print tokens \
print " tokens remaining."
crlf
print "How many would you like to take? " \

input take

if take > 3 or take < 1 then

print "You must take between 1 to 3 tokens."

endif

if tokens - take < 0 then

print "You cannot take that many."

endif

if take <= 3 and take >= 1 and tokens - take >= 0 then

let tokens = tokens - take

if tokens = 0 then

bell
print "Congratulations. You got the last token."
pause
end

endif

let take = 4 - take

if tokens >= 15 then

let take = 3

endif

if tokens <= 3 then

let take = tokens

endif

print "I will take " \
print take \
print " of the tokens."

let tokens = tokens - take

if tokens = 0 then

print "I got the last token. I win. Better luck next time."
pause
end

endif

endif

loop

sub intro

cls
print "NIM game"
crlf
print "Press any key to play..."
cls

return
```

### GW-BASIC

```10 HEAP = 12
20 WHILE HEAP>0
30 TAKE = 0
40 PRINT "There are ";HEAP;" tokens left."
50 WHILE TAKE < 1 OR TAKE > 3 OR TAKE > HEAP
60 INPUT "How many would you like to take? ", TAKE
70 IF TAKE = HEAP THEN GOTO 140
80 WEND
90 PRINT "I will take ";4-TAKE;" tokens."
100 HEAP = HEAP - 4
110 WEND
120 PRINT "I got the last token. Better luck next time."
130 END
140 PRINT "You got the last token. Congratulations!"
150 END```

### IS-BASIC

```100 PROGRAM "Nim.bas"
110 RANDOMIZE
120 CLEAR SCREEN
130 LET TOKENS=12
140 PRINT "Starting with";TOKENS;"tokens.":PRINT
150 DO
160   PRINT "How many tokens will you take? (1-3) ";
170   DO
180     LET K=VAL(INKEY\$)
190   LOOP UNTIL K>0 AND K<4
200   LET TOKENS=MAX(TOKENS-K,0):LET G=0
210   PRINT K:PRINT TAB(19);TOKENS;"remainig.":PRINT
220   IF TOKENS>0 THEN
230     LET L=MOD(TOKENS,4)
240     IF L=0 THEN LET L=MIN(RND(3)+1,TOKENS)
250     LET TOKENS=TOKENS-L:LET G=-1
260     PRINT "Computer takes";L;"tokens.";TOKENS;"remaining.":PRINT
270   END IF
280 LOOP WHILE TOKENS>0
290 IF G THEN
300   PRINT "Computer wins!"
310 ELSE
320   PRINT "You win!"
330 END IF```

### Minimal BASIC

Translation of: Tiny BASIC
Works with: BASICA
Works with: Chipmunk Basic
Works with: GW-BASIC
Works with: MSX BASIC
Works with: PC-BASIC version any
Works with: QBasic
```10 LET H = 12
20 PRINT "There are"
30 PRINT H
40 PRINT "tokens remaining. How many would you like to take?"
50 INPUT T
60 IF T > 3 THEN 170
70 IF T < 1 THEN 170
80 LET H = H - T
90 IF H = 0 THEN 190
100 LET T = 4 - T
110 PRINT "I will take"
120 PRINT T
130 PRINT "tokens."
140 LET H = H - T
150 IF H = 0 THEN 210
160 GOTO 20
170 PRINT "You must take 1, 2, or 3 tokens."
180 GOTO 50
190 PRINT "Congratulations. You got the last token."
200 GOTO 220
210 PRINT "I got the last token. I win. Better luck next time."
220 END
```

### MSX Basic

Works with: MSX BASIC version any
Works with: Applesoft BASIC
Works with: BASICA
Works with: Chipmunk Basic
Works with: GW-BASIC
Works with: PC-BASIC version any
Works with: QBasic
```100 CLS : rem  100 HOME for Applesoft BASIC
110 LET M = 12
120 LET L = 0
130 IF M <= 0 THEN GOTO 220
140 PRINT "There are "; M; " tokens remaining. How many would you like to take";
150 INPUT L
160 IF L <> 0 AND L <= 3 THEN GOTO 190
170 PRINT "You must take 1, 2, or 3 tokens. How many would you like to take";
180 GOTO 150
190 PRINT "On my turn I will take "; 4 - L; " token(s)."
200 LET M = M - 4
210 GOTO 130
220 PRINT
230 PRINT "I got the last token. I win! Better luck next time."
240 END
```

### PureBasic

```OpenConsole()
Define monton.i = 12, llevar.i

While monton > 0
Print("There are " + Str(monton) + " tokens remaining. How many would you like to take? ")
llevar = Val(Input())
While llevar = 0 Or llevar > 3
Print("You must take 1, 2, or 3 tokens. How many would you like to take ")
llevar = Val(Input())
Wend

PrintN("On my turn I will take " + Str(4 - llevar) + " token(s).")
monton = monton - 4
Wend

PrintN("I got the last token. I win! Better luck next time.")

PrintN(#CRLF\$ + "--- terminado, pulsa RETURN---"): Input()
CloseConsole()```

### QBasic

Works with: QBasic version 1.1
Works with: QuickBasic version 4.5
```monton = 12
llevar = 0

DO WHILE monton > 0
PRINT USING "There are ## tokens remaining. How many would you like to take"; monton;
INPUT llevar
DO WHILE llevar = 0 OR llevar > 3
INPUT "You must take 1, 2, or 3 tokens. How many would you like to take"; llevar
LOOP

PRINT "On my turn I will take"; 4 - llevar; " token(s)."
monton = monton - 4
LOOP

PRINT
PRINT "I got the last token. I win! Better luck next time."
END
```

### Quite BASIC

Translation of: Minimal BASIC
Works with: BASICA
Works with: Chipmunk Basic
Works with: GW-BASIC
Works with: MSX BASIC
Works with: PC-BASIC version any
Works with: QBasic
```10 LET H = 12
20 PRINT "There are"
30 PRINT H
40 PRINT "tokens remaining. How many would you like to take?"
50 INPUT ""; T
60 IF T > 3 THEN 170
70 IF T < 1 THEN 170
80 LET H = H - T
90 IF H = 0 THEN 190
100 LET T = 4 - T
110 PRINT "I will take"
120 PRINT T
130 PRINT "tokens."
140 LET H = H - T
150 IF H = 0 THEN 210
160 GOTO 20
170 PRINT "You must take 1, 2, or 3 tokens."
180 GOTO 50
190 PRINT "Congratulations. You got the last token."
200 GOTO 220
210 PRINT "I got the last token. I win. Better luck next time."
220 END
```

### Run BASIC

Works with: Just BASIC
Works with: Liberty BASIC
```monton = 12
llevar = 0

while monton > 0
input "There are "; monton; " tokens remaining. How many would you like to take? "; llevar
while llevar = 0 or llevar > 3
input "You must take 1, 2, or 3 tokens. How many would you like to take "; llevar
wend

print "On my turn I will take "; 4 - llevar; " token(s)."
monton = monton - 4
wend

print
print "I got the last token. I win! Better luck next time."
end```

### S-Basic

```\$constant maxtokens = 12
\$constant machine = 0
\$constant human = 1
\$constant false = 0
\$constant true = 0FFFFH

procedure welcome
print "Welcome to the Game of Nim."
print "We begin with";maxtokens;" tokens. On each turn, a player"
print "may take between 1 and 3 tokens. The player who takes the"
print "last token wins."
print
end

procedure show(n = integer)
var i = integer
print "Available tokens:";n;"  ";
rem - provide a visual display
for i =  1 to n
print "o ";
next i
print
end

function getnum(lowlim, toplim = integer) = integer
var ok, n = integer
repeat
begin
input "You take:";n
if n < lowlim or n > toplim then
begin
print "Must take between";lowlim;" and";toplim
print "Try again."
ok = false
end
else
ok = true
end
until ok
end = n

function play(player, tokens, taken = integer) = integer
if player = human then
taken = getnum(1,3)
else
begin
if tokens <= 3 then
taken = tokens
else
taken = 4 - taken
end
end = taken

procedure report(player = integer)
if player = human then
print "You took the last one. You win. Congratulations!"
else
print "I took the last one, so I win. Sorry about that."
end

var player, tokens, taken  = integer

welcome
tokens = maxtokens
taken = 0
player = human
print "You go first."
repeat
begin
show tokens
taken = play(player, tokens, taken)
if player = machine then print "I took:";taken
tokens = tokens - taken
if tokens > 0 then player = 1 - player
end
until tokens <= 0
report player
print "Thanks for playing!"

end
```
Output:
```Welcome to the Game of Nim.
We begin with 12 tokens. On each turn, a
player may take between 1 and 3 tokens. The player
who takes the last token wins.

You go first.
Available tokens: 12  o o o o o o o o o o o o
You take:? 4
Must take between 1 and 3
Try again.
You take:? 3
Available tokens: 9  o o o o o o o o o
I took: 1
Available tokens: 8  o o o o o o o o
You take:? 2
Available tokens: 6  o o o o o o
I took: 2
Available tokens: 4  o o o o
You take:? 1
Available tokens: 3  o o o
I took: 3
I took the last one, so I win. Sorry about that.
Thanks for playing!
```

### Tiny BASIC

Works with: TinyBasic
```10 LET H = 12
20 PRINT "There are"
30 PRINT H
40 PRINT "tokens remaining. How many would you like to take?"
50 INPUT T
60 IF T > 3 THEN GOTO 170
70 IF T < 1 THEN GOTO 170
80 LET H = H - T
90 IF H = 0 THEN GOTO 190
100 LET T = 4 - T
110 PRINT "I will take"
120 PRINT T
130 PRINT "tokens."
140 LET H = H - T
150 IF H = 0 THEN GOTO 210
160 GOTO 20
170 PRINT "You must take 1, 2, or 3 tokens."
180 GOTO 50
190 PRINT "Congratulations. You got the last token."
200 END
210 PRINT "I got the last token. I win. Better luck next time."
220 END
```

### True BASIC

Works with: QBasic
Works with: Just BASIC
Works with: Liberty BASIC
```LET monton = 12
LET llevar = 0

DO WHILE monton > 0
PRINT "Quedan"; monton; "fichas. ¿Cuántas te gustaría tomar";
INPUT llevar
DO WHILE llevar = 0 Or llevar > 3
PRINT "Debes tomar 1, 2, o 3 fichas. ¿Cuántas te gustaría tomar";
INPUT llevar
LOOP

PRINT "Es mi turno, tomaré"; 4-llevar; "ficha(s)."
LET monton = monton - 4
LOOP

PRINT
PRINT "Obtuve la última ficha. ¡Gané! Mejor suerte la próxima vez."
END
```

### XBasic

Works with: Windows XBasic
Translation of: FreeBASIC
```PROGRAM	"nim-game"
VERSION	"0.0000"

DECLARE FUNCTION Entry ()

FUNCTION Entry ()

monton = 12

DO WHILE monton > 0
PRINT "There are "; monton; " tokens remaining. How many would you like to take? ";
llevar = UBYTE(INLINE\$(""))
DO WHILE (llevar <= 0) OR (llevar > 3)
llevar = UBYTE(INLINE\$("You must take 1, 2, or 3 tokens. How many would you like to take"))
LOOP

PRINT "On my turn I will take"; 4 - llevar; " token(s)."
monton = monton - 4
LOOP

PRINT "\nI got the last token. I win! Better luck next time."

END FUNCTION
END PROGRAM
```

### Yabasic

```monton = 12
llevar = 0

while monton > 0
print "There are ", monton, " tokens remaining. How many would you like to take? ";
input "" llevar
while llevar = 0 or llevar > 3
input "You must take 1, 2, or 3 tokens. How many would you like to take? " llevar
wend

print "On my turn I will take ", 4 - llevar, " token(s)."
monton = monton - 4
wend

print "\nI got the last token. I win! Better luck next time."
end
```

## BlooP

Bloop has no input capabilites, so the game is defined as a procedure, called with 3 numbers (since the game will last only 3 rounds anyhow). The procedure can be called with more numbers - extra parameters are ignored in most implementations I have found. Since there is no easy way to get more inputs, any incorrect values are converted to correct ones.

```DEFINE PROCEDURE ''DIVIDE'' [A,B]:
BLOCK 0: BEGIN
IF A < B, THEN:
QUIT BLOCK 0;
CELL(0) <= 1;
OUTPUT <= 1;
LOOP AT MOST A TIMES:
BLOCK 2: BEGIN
IF OUTPUT * B = A, THEN:
QUIT BLOCK 0;
OUTPUT <= OUTPUT + 1;
IF OUTPUT * B > A, THEN:
BLOCK 3: BEGIN
OUTPUT <= CELL(0);
QUIT BLOCK 0;
BLOCK 3: END;
CELL(0) <= OUTPUT;
BLOCK 2: END;
BLOCK 0: END.

DEFINE PROCEDURE ''MINUS'' [A,B]:
BLOCK 0: BEGIN
IF A < B, THEN:
QUIT BLOCK 0;
LOOP AT MOST A TIMES:
BLOCK 1: BEGIN
IF OUTPUT + B = A, THEN:
QUIT BLOCK 0;
OUTPUT <= OUTPUT + 1;
BLOCK 1: END;
BLOCK 0: END.

DEFINE PROCEDURE ''MODULUS'' [A,B]:
BLOCK 0: BEGIN
CELL(0) <= DIVIDE[A,B];
OUTPUT <= MINUS[A,CELL(0) * B];
BLOCK 0: END.

DEFINE PROCEDURE ''PLAYER_TURN'' [TOKENS_LEFT, TAKE]:
BLOCK 0: BEGIN
CELL(0) <= TAKE;

IF TAKE > 3, THEN:
BLOCK 1: BEGIN
CELL(0) <= MODULUS [TAKE, 3] + 1;
PRINT ['take must be between 1 and 3. setting take to ', CELL(0), '.'];
BLOCK 1: END;

IF TAKE < 1, THEN:
BLOCK 2: BEGIN
CELL(0) <= 1;
PRINT ['take must be between 1 and 3. setting take to 1.'];
BLOCK 2: END;

OUTPUT <= MINUS [TOKENS_LEFT, CELL(0)];

PRINT ['player takes ', CELL(0), ' tokens.'];
PRINT ['tokens remaining: ', OUTPUT];
PRINT [''];
BLOCK 0: END.

DEFINE PROCEDURE ''COMPUTER_TURN'' [TOKENS_LEFT]:
BLOCK 0: BEGIN
CELL(0) <= MODULUS [TOKENS_LEFT, 4];
OUTPUT <= MINUS [TOKENS_LEFT, CELL(0)];

PRINT ['computer takes ', CELL(0), ' tokens.'];
PRINT ['tokens remaining: ', OUTPUT];
PRINT [''];
BLOCK 0: END.

DEFINE PROCEDURE ''PLAY_GAME'' [FST, SEC, THD]:
BLOCK 0: BEGIN
CELL(0) <= FST;
CELL(1) <= SEC;
CELL(2) <= THD;
OUTPUT <= 12;

LOOP 3 TIMES:
BLOCK 1: BEGIN
OUTPUT <= PLAYER_TURN [OUTPUT, CELL(0)];
CELL(0) <= CELL(1);
CELL(1) <= CELL(2);

OUTPUT <= COMPUTER_TURN [OUTPUT];
BLOCK 1: END;

PRINT ['computer wins!'];
BLOCK 0: END.

PLAY_GAME [1,4,3];```
Output:

Sample game:

``` > PLAYER TAKES 1 TOKENS.
> TOKENS REMAINING: 11
>
> COMPUTER TAKES 3 TOKENS.
> TOKENS REMAINING: 8
>
> TAKE MUST BE BETWEEN 1 AND 3. SETTING TAKE TO 2.
> PLAYER TAKES 2 TOKENS.
> TOKENS REMAINING: 6
>
> COMPUTER TAKES 2 TOKENS.
> TOKENS REMAINING: 4
>
> PLAYER TAKES 3 TOKENS.
> TOKENS REMAINING: 1
>
> COMPUTER TAKES 1 TOKENS.
> TOKENS REMAINING: 0
>
> COMPUTER WINS!
=> 0
```

## C

```#include  <stdio.h>

int playerTurn(int numTokens, int take);
int computerTurn(int numTokens);

int main(void)
{
printf("Nim Game\n\n");

int Tokens = 12;

while(Tokens > 0)
{
printf("How many tokens would you like to take?: ");

int uin;
scanf("%i", &uin);

int nextTokens = playerTurn(Tokens, uin);

if (nextTokens == Tokens)
{
continue;
}

Tokens = nextTokens;

Tokens = computerTurn(Tokens);
}
printf("Computer wins.");

return 0;
}

int playerTurn(int numTokens, int take)
{
if (take < 1 || take > 3)
{
printf("\nTake must be between 1 and 3.\n\n");
return numTokens;
}
int remainingTokens = numTokens - take;

printf("\nPlayer takes %i tokens.\n", take);
printf("%i tokens remaining.\n\n", remainingTokens);

return remainingTokens;
}

int computerTurn(int numTokens)
{
int take = numTokens % 4;
int remainingTokens = numTokens - take;

printf("Computer takes %u tokens.\n", take);
printf("%i tokens remaining.\n\n", remainingTokens);

return remainingTokens;
}
```
Output:

Sample game:

```Nim Game

How many tokens would you like to take?: 4
Take must be between 1 and 3.

How many tokens would you like to take?: 2
Player takes 2 tokens.
10 tokens remaining.

Computer takes 2 tokens.
8 tokens remaining.

How many tokens would you like to take?: 1
Player takes 1 tokens.
7 tokens remaining.

Computer takes 3 tokens.
4 tokens remaining.

How many tokens would you like to take?: 3
Player takes 3 tokens.
1 tokens remaining.

Computer takes 1 tokens.
0 tokens remaining.

Computer wins.
```

## C++

Translation of: Go
```#include <iostream>
#include <limits>

using namespace std;

void showTokens(int tokens) {
cout << "Tokens remaining " << tokens << endl << endl;
}

int main() {
int tokens = 12;
while (true) {
showTokens(tokens);
cout << "  How many tokens 1, 2 or 3? ";
int t;
cin >> t;
if (cin.fail()) {
cin.clear();
cin.ignore(numeric_limits<streamsize>::max(), '\n');
cout << endl << "Invalid input, try again." << endl << endl;
} else if (t < 1 || t > 3) {
cout << endl << "Must be a number between 1 and 3, try again." << endl << endl;
} else {
int ct = 4 - t;
string s  = (ct > 1) ? "s" : "";
cout << "  Computer takes " << ct << " token" << s << endl << endl;
tokens -= 4;
}
if (tokens == 0) {
showTokens(0);
cout << "  Computer wins!" << endl;
return 0;
}
}
}
```
Output:

Sample game:

```Tokens remaining 12

How many tokens 1, 2 or 3? nim

Invalid input, try again.

Tokens remaining 12

How many tokens 1, 2 or 3? 1
Computer takes 3 tokens

Tokens remaining 8

How many tokens 1, 2 or 3? 0

Must be a number between 1 and 3, try again.

Tokens remaining 8

How many tokens 1, 2 or 3? 2
Computer takes 2 tokens

Tokens remaining 4

How many tokens 1, 2 or 3? 3
Computer takes 1 token

Tokens remaining 0

Computer wins!
```

## C#

```using System;

namespace nimGame
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("There are twelve tokens.\n" +
"You can take 1, 2, or 3 on your turn.\n" +
"Whoever takes the last token wins.\n");

int tokens = 12;

while (tokens > 0)
{
Console.WriteLine("There are " + tokens + " remaining.");
Console.WriteLine("How many do you take?");

if (playertake < 1 | playertake > 3)
{
Console.WriteLine("1, 2, or 3 only.");
}
else
{
tokens -= playertake;
Console.WriteLine("I take " + (4 - playertake) + ".");
tokens -= (4 - playertake);
}
}
Console.WriteLine("I win again.");
}

}
}
```
Output:

Sample game:

```There are twelve tokens.
You can take 1, 2, or 3 on your turn.
Whoever takes the last token wins.

There are 12 remaining.
How many do you take?
3
I take 1.
There are 8 remaining.
How many do you take?
1
I take 3.
There are 4 remaining.
How many do you take?
2
I take 2.
I win again.
```

## COBOL

Works with: GNUCobol version 2.0.0 y posterior
```       IDENTIFICATION DIVISION.
PROGRAM-ID. NIM-GAME.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 MONTON PIC 99 VALUE 12.
01 LLEVAR PIC 9 VALUE 0.
01 TEMP   PIC 9.

PROCEDURE DIVISION.
PERFORM UNTIL MONTON = 0
DISPLAY "There are " MONTON " tokens remaining. How many"
"would you like to take? "
ACCEPT LLEVAR
PERFORM UNTIL LLEVAR > 0 AND LLEVAR < 4
DISPLAY "You must take 1, 2, or 3 tokens. How many"
"would you like to take "
ACCEPT LLEVAR
END-PERFORM
COMPUTE TEMP = 4 - LLEVAR
DISPLAY "On my turn I will take " TEMP " token(s)."
SUBTRACT 4 FROM MONTON
END-PERFORM
DISPLAY " "
DISPLAY "I got the last token. I win! Better luck next time."
STOP RUN.
```

## Clojure

```(loop [n 12]
(print (format "%s remain, take how many?\n> " n)) (flush)
(let [v (try (Long. (clojure.string/trim (read-line)))
(catch Exception _ 0))]
(if (#{1 2 3} v)
(do (println (format "You took %s, leaving %s, computer takes %s..."
v (- n v) (- 4 v)))
(if (= 4 n)
(println "Computer wins. 😐")
(recur (- n 4))))
(do (println "Please enter 1, 2, or 3...")
(recur n)))))
```
Output:

Sample game:

```harold@freeside:~/src/clj-nim\$ rlwrap clj -M nim.clj
12 remain, take how many?
3
You took 3, leaving 9, computer takes 1...
8 remain, take how many?
2
You took 2, leaving 6, computer takes 2...
4 remain, take how many?
1
You took 1, leaving 3, computer takes 3...
Computer wins. 😐
```

## Common Lisp

```(defun pturn (curTokens)
(write-string "How many tokens would you like to take?: ")
(setq tokensRemaining (- curTokens ans))
(format t "You take ~D tokens~%" ans)
(printRemaining tokensRemaining)
tokensRemaining)

(defun cturn (curTokens)
(setq take (mod curTokens 4))
(setq tokensRemaining (- curTokens take))
(format t "Computer takes ~D tokens~%" take)
(printRemaining tokensRemaining)
tokensRemaining)

(defun printRemaining (remaining)
(format t "~D tokens remaining~%~%" remaining))

(format t "LISP Nim~%~%")
(setq tok 12)
(loop
(setq tok (pturn tok))
(setq tok (cturn tok))
(if (<= tok 0)
(return)))
(write-string "Computer wins!")
```
Output:
```LISP Nim

How many tokens would you like to take?: 2
You take 2 tokens
10 tokens remaining

Computer takes 2 tokens
8 tokens remaining

How many tokens would you like to take?: 1
You take 1 tokens
7 tokens remaining

Computer takes 3 tokens
4 tokens remaining

How many tokens would you like to take?: 3
You take 3 tokens
1 tokens remaining

Computer takes 1 tokens
0 tokens remaining

Computer wins!
```

## Crystal

```tokens = 12

until tokens <= 0
puts "There are #{tokens} tokens remaining.\nHow many tokens do you take?"
until (input = (gets || "").to_i?) && (1..3).includes? input
puts "Enter an integer between 1 and 3."
end
puts "Player takes #{input} tokens.\nComputer takes #{4-input} tokens."
tokens -= 4
end

puts "Computer wins."
```

## Dyalect

```print("There are twelve tokens.")
print("You can take 1, 2, or 3 on your turn.")
print("Whoever takes the last token wins.\n")

var tokens = 12
while tokens > 0 {
print("There are \(tokens) remaining.")
print("How many do you take?")

if playertake < 1 || playertake > 3 {
print("1, 2, or 3 only.")
} else {
tokens -= playertake
print("I take \(4 - playertake).")
tokens -= (4 - playertake)
}
}

print("I win again.")```

## EasyLang

[Run it]

Translation of: BASIC256
```token = 12
while token > 0
repeat
print "There are " & token & " tokens remaining."
write "How many would you like to take? (1,2 or 3) "
h = number input
print h
until h >= 1 and h <= 3
.
sleep 1
print "On my turn I will take " & 4 - h & " token(s)."
print ""
token -= 4
.
print "I got the last token. I win! Better luck next time."```

## Factor

```USING: interpolate io kernel math math.parser sequences ;
IN: rosetta-code.nim-game

: get-input ( -- n )
"Number of tokens to take (1, 2, or 3): " write readln
string>number dup { 1 2 3 } member?
[ drop "Invalid move." print get-input ] unless ;

: .remaining ( n -- )
nl [I -~~==[ \${} tokens remaining ]==~~-I] nl nl ;

: .choice ( str n -- )
dup 1 = "" "s" ? [I \${} took \${} token\${}I] nl ;

: (round) ( -- )
"You" get-input "Computer" 4 pick - [ .choice ] 2bi@ ;

: round ( n -- n-4 )
dup dup .remaining [ drop (round) 4 - round ] unless-zero ;

: nim-game ( -- ) 12 round drop "Computer wins!" print ;

MAIN: nim-game
```
Output:
```
-~~==[ 12 tokens remaining ]==~~-

Number of tokens to take (1, 2, or 3): 1
You took 1 token
Computer took 3 tokens

-~~==[ 8 tokens remaining ]==~~-

Number of tokens to take (1, 2, or 3): 3
You took 3 tokens
Computer took 1 token

-~~==[ 4 tokens remaining ]==~~-

Number of tokens to take (1, 2, or 3): 4
Invalid move.
Number of tokens to take (1, 2, or 3): 2
You took 2 tokens
Computer took 2 tokens

-~~==[ 0 tokens remaining ]==~~-

Computer wins!
```

## Fermat

```heap:=12;
while heap>0 do
!!('There are ',heap,' tokens left. How many do you want to take?');
?take;
while take<1 or take>3 or take>heap do
!!('You cannot take that number. Choose again.');
?take;
od;
!!('On my turn I will take ',4-take,' tokens.');
heap:-(4);
od;

!!('I got the last token. Better luck next time!');```
Output:
```There are  12 tokens left. How many do you want to take?
>take := 4
You cannot take that number. Choose again.
>take := 3
On my turn I will take  1 tokens.
There are  8 tokens left. How many do you want to take?
>take := 2
On my turn I will take  2 tokens.
There are  4 tokens left. How many do you want to take?
>take := 2
On my turn I will take  2 tokens.

I got the last token. Better luck next time!```

## Go

```package main

import (
"bufio"
"fmt"
"os"
"strconv"
)

func showTokens(tokens int) {
fmt.Println("Tokens remaining", tokens, "\n")
}

func main() {
tokens := 12
scanner := bufio.NewScanner(os.Stdin)
for {
showTokens(tokens)
fmt.Print("  How many tokens 1, 2 or 3? ")
scanner.Scan()
if scerr := scanner.Err(); scerr != nil {
return
}
t, err := strconv.Atoi(scanner.Text())
if err != nil || t < 1 || t > 3 {
fmt.Println("\nMust be a number between 1 and 3, try again.\n")
} else {
ct := 4 - t
s := "s"
if ct == 1 {
s = ""
}
fmt.Print("  Computer takes ", ct, " token", s, "\n\n")
tokens -= 4
}
if tokens == 0 {
showTokens(0)
fmt.Println("  Computer wins!")
return
}
}
}
```
Output:

Sample game:

```Tokens remaining 12

How many tokens 1, 2 or 3? 2
Computer takes 2 tokens

Tokens remaining 8

How many tokens 1, 2 or 3? 4

Must be a number between 1 and 3, try again.

Tokens remaining 8

How many tokens 1, 2 or 3? 1
Computer takes 3 tokens

Tokens remaining 4

How many tokens 1, 2 or 3? 3
Computer takes 1 token

Tokens remaining 0

Computer wins!
```

```import Data.Char (isDigit, digitToInt)
import System.IO

prompt :: String
prompt = "How many do you take? 1, 2 or 3? "

getPlayerSelection :: IO Int
getPlayerSelection = do
hSetBuffering stdin NoBuffering
c <- getChar
putChar '\n'
if isDigit c && digitToInt c <= 3 then
pure (digitToInt c)
else do
putStrLn "Invalid input"
putStr prompt
getPlayerSelection

play :: Int -> IO ()
play n = do
putStrLn \$ show n ++ token n ++ " remain."
if n == 0 then putStrLn "Computer Wins!"
else do
putStr prompt
playerSelection <- getPlayerSelection
let computerSelection
| playerSelection > 4 = playerSelection - 4
| otherwise = 4 - playerSelection
putStrLn \$ "Computer takes " ++ show computerSelection ++ token computerSelection ++ ".\n"
play (n - computerSelection - playerSelection)
where token 1 = " token"
token _ = " tokens"

main :: IO ()
main = play 12
```
Output:
```12 tokens remain.
How many do you take? 1, 2 or 3? 3
Computer takes 1 token.

8 tokens remain.
How many do you take? 1, 2 or 3? 2
Computer takes 2 tokens.

4 tokens remain.
How many do you take? 1, 2 or 3? 1
Computer takes 3 tokens.

0 tokens remain.
Computer Wins!
```

## J

Implementation:

```nim=: {{
prompt tokens=: 12
}}

prompt=: {{
echo 'tokens: ',":tokens
if. 1>tokens do.
echo 'game over'
else.
echo 'take 1, 2 or 3 tokens'
end.
}}

take=: {{
assert. y e.1 2 3
assert. 0=#\$y
echo 'tokens: ',":tokens=:tokens-y
echo 'I take ',(":t=. 4-y),' tokens'
prompt tokens=:tokens-t
}}
```

Sample session:

```   nim''
tokens: 12
take 1, 2 or 3 tokens
take 1
tokens: 11
I take 3 tokens
tokens: 8
take 1, 2 or 3 tokens
take 3
tokens: 5
I take 1 tokens
tokens: 4
take 1, 2 or 3 tokens
take 2
tokens: 2
I take 2 tokens
tokens: 0
game over
```

## Java

```import java.util.Scanner;

public class NimGame {

public static void main(String[] args) {
runGame(12);
}

private static void runGame(int tokens) {
System.out.printf("Nim game.%n%n");

Scanner in = new Scanner(System.in);;

do {
boolean humanInputOk = false;
int humanTokens = 0;
while ( ! humanInputOk ) {
System.out.printf("Human takes how many tokens?  ");
String input = in.next();
try {
humanTokens = Integer.parseInt(input);
if ( humanTokens >= 1 && humanTokens <= 3 ) {
humanInputOk = true;
}
else {
System.out.printf("Try a number between 1 and 3.%n");
}
}
catch (NumberFormatException e) {
System.out.printf("Invalid input.  Try a number between 1 and 3.%n");
}
}

tokens -= humanTokens;

System.out.printf("You take %d token%s.%n%d token%s remaining.%n%n", humanTokens, humanTokens > 1 ? "s" : "", tokens, tokens != 1 ? "s" : "");
if ( tokens == 0 ) {
System.out.printf("You win!!.%n%n");
break;
}
int computerTokens = 4 - humanTokens;
tokens -= computerTokens;

System.out.printf("Computer takes %d token%s.%n%d token%s remaining.%n%n", computerTokens, computerTokens != 1 ? "s" : "", tokens, tokens != 1 ? "s" : "");
if ( tokens == 0 ) {
System.out.printf("Computer wins!!.%n%n");
}

} while (tokens > 0);

in.close();
}

}
```
Output:

Sample game:

```Nim game.

Human takes how many tokens?  nim
Invalid input.  Try a number between 1 and 3.
Human takes how many tokens?  0
Try a number between 1 and 3.
Human takes how many tokens?  2
You take 2 tokens.
10 tokens remaining.

Computer takes 2 tokens.
8 tokens remaining.

Human takes how many tokens?  1
You take 1 token.
7 tokens remaining.

Computer takes 3 tokens.
4 tokens remaining.

Human takes how many tokens?  3
You take 3 tokens.
1 token remaining.

Computer takes 1 token.
0 tokens remaining.

Computer wins!!.
```

## JavaScript

### Browser Version

This is the easy but dirty way - with prompt for input, and console.log for output. The Nim class was structured so that input and output could be customized, for example to use HTML DOM elements for in and out, instead of the terminal.

```class Nim {
constructor(tokens, printFun) {
this.startTokens = tokens;
this.tokens = tokens;
this.printFun = printFun;
}

playerTurn(take) {
take = Math.round(take);

if (take < 1 || take > 3) {
this.printFun("take must be between 1 and 3.\n")
return false;
}
this.tokens -= take;
this.printFun("Player takes " + take + " tokens.");
this.printRemaining()

if (this.tokens === 0) {
this.printFun("Player wins!\n");
}
return true;
}

computerTurn() {
let take = this.tokens % 4;
this.tokens -= take;
this.printFun("Computer takes " + take + " tokens.");
this.printRemaining();

if (this.tokens === 0) {
this.printFun("Computer wins.\n");
}

}

printRemaining() {
this.printFun(this.tokens + " tokens remaining.\n");
}
}

let game = new Nim(12, console.log);
while (true) {
if (game.playerTurn(parseInt(prompt("How many tokens would you like to take?")))){
game.computerTurn();
}
if (game.tokens == 0) {
break;
}
}
```
Output:

Sample game:

```(prompt) How many tokens would you like to take? 2
Player takes 2 tokens.
10 tokens remaining.

Computer takes 2 tokens.
8 tokens remaining.

(prompt) How many tokens would you like to take? 4
take must be between 1 and 3.

(prompt) How many tokens would you like to take? 0
take must be between 1 and 3.

(prompt) How many tokens would you like to take? 3
Player takes 3 tokens.
5 tokens remaining.

Computer takes 1 tokens.
4 tokens remaining.

(prompt) How many tokens would you like to take? 1
Player takes 1 tokens.
3 tokens remaining.

Computer takes 3 tokens.
0 tokens remaining.

Computer wins.
```

## jq

Works with: jq

Also works with gojq, the Go implementation of jq.

```def play(\$tokens):
label \$out
| "There are \(\$tokens) tokens.  Take at most \([\$tokens,3]|min) or enter q to quit.",
( foreach inputs as \$in ( {\$tokens};
if \$in == "q" then break \$out
else .in = \$in
| if \$in | test("^[0-9]+\$") then .in |= tonumber else .in = null end
| if .in and .in > 0 and .in < 4
then  (4 - .in) as \$ct
| (if \$ct == 1 then "" else "s" end) as \$s
| .emit = "  Computer takes \(\$ct) token\(\$s);"
| .tokens += -4
else .emit = "Please enter a number from 1 to \([3, .tokens]|min) inclusive."
end
end;

.emit,
if .tokens == 0
then "\nComputer wins!", break \$out
elif .tokens < 0 then "\nCongratulations!", break \$out
else "\(.tokens) tokens remain. How many tokens will you take?"
end )) ;

play(12)```
```\$ jq -nRr -f nim-game.jq
There are 12 tokens.  Take at most 3 or enter q to quit.
2
Computer takes 2 tokens;
8 tokens remain. How many tokens will you take?
1
Computer takes 3 tokens;
4 tokens remain. How many tokens will you take?
4
Please enter a number from 1 to 3 inclusive.
4 tokens remain. How many tokens will you take?
3
Computer takes 1 token;

Computer wins!
```

## Julia

Translation of: Raku
```function nimgame()
tcount = 12
takenum = 0
while true
while true
permitted = collect(1:min(3,tcount))
println("\$tcount tokens remain.\nHow many do you take (\$permitted)? ")
if takenum in permitted
break
end
end
tcount -= 4
println("Computer takes \$(4 - takenum). There are \$tcount tokens left.")
if tcount < 1
println("Computer wins as expected.")
break
end
end
end

nimgame()
```
Output:
```12 tokens remain.
How many do you take ([1, 2, 3])?
3
Computer takes 1. There are 8 tokens left.
8 tokens remain.
How many do you take ([1, 2, 3])?
2
Computer takes 2. There are 4 tokens left.
4 tokens remain.
How many do you take ([1, 2, 3])?
1
Computer takes 3. There are 0 tokens left.
Computer wins as expected.
```

## Kotlin

Translation of: Go
```// Version 1.3.21

fun showTokens(tokens: Int) {
println("Tokens remaining \$tokens\n")
}

fun main() {
var tokens = 12
while (true) {
showTokens(tokens)
print("  How many tokens 1, 2 or 3? ")
if (t == null || t < 1 || t > 3) {
println("\nMust be a number between 1 and 3, try again.\n")
} else {
var ct = 4 - t
var s = if (ct > 1) "s" else ""
println("  Computer takes \$ct token\$s\n")
tokens -= 4
}
if (tokens == 0) {
showTokens(0)
println("  Computer wins!")
return
}
}
}
```
Output:

Sample game:

```Tokens remaining 12

How many tokens 1, 2 or 3? 3
Computer takes 1 token

Tokens remaining 8

How many tokens 1, 2 or 3? nim

Must be a number between 1 and 3, try again.

Tokens remaining 8

How many tokens 1, 2 or 3? 2
Computer takes 2 tokens

Tokens remaining 4

How many tokens 1, 2 or 3? 1
Computer takes 3 tokens

Tokens remaining 0

Computer wins!
```

## Lua

```tokens = 12

print("Nim Game\n")
print("Starting with " .. tokens .. " tokens.\n\n")

function printRemaining()
print(tokens .. " tokens remaining.\n")
end

function playerTurn(take)
take = math.floor(take)
if (take < 1 or take > 3) then
print ("\nTake must be between 1 and 3.\n")
return false
end

tokens = tokens - take

print ("\nPlayer takes " .. take .. " tokens.")
printRemaining()
return true
end

function computerTurn()
take = tokens % 4
tokens = tokens - take

print("Computer takes " .. take .. " tokens.")
printRemaining()
end

while (tokens > 0) do
io.write("How many tokens would you like to take?: ")
computerTurn()
end
end

print ("Computer wins.")
```
Output:

Sample game output:

```Nim Game

Starting with 12 tokens.

How many tokens would you like to take?: 3
Player takes 3 tokens.
9 tokens remaining.

Computer takes 1 tokens.
8 tokens remaining.

How many tokens would you like to take?: 4
Take must be between 1 and 3.

How many tokens would you like to take?: 1
Player takes 1 tokens.
7 tokens remaining.

Computer takes 3 tokens.
4 tokens remaining.

How many tokens would you like to take?: 2
Player takes 2 tokens.
2 tokens remaining.

Computer takes 2 tokens.
0 tokens remaining.

Computer wins.
```

## Mathematica/Wolfram Language

```n = 12;
While[n > 0,
c = ChoiceDialog["Current amount = " <> ToString[n] <> "\nHow many do you want to pick?", {1 -> 1, 2 -> 2, 3 -> 3}];
n -= c;
ChoiceDialog["Current amount = " <> ToString[n] <> "\nComputer takes " <> ToString[4 - c]];
n -= (4 - c);
]
ChoiceDialog["Current amount = " <> ToString[n] <> "\n You lost!"]
```

## MiniScript

Translation of: Lua
```tokens = 12

print "Nim Game"
print "Starting with " + tokens + " tokens."
print

printRemaining = function()
print tokens + " tokens remaining."
print
end function

playerTurn = function(take)
take = floor(val(take))
if take < 1 or take > 3 then
print "Take must be between 1 and 3."
return false
end if

globals.tokens = tokens - take

print "Player takes " + take + " tokens."
printRemaining
return true
end function

computerTurn = function()
take = tokens % 4
globals.tokens = tokens - take

print "Computer takes " + take + " tokens."
printRemaining
end function

while tokens > 0
if playerTurn(input("How many tokens would you like to take? ")) then
computerTurn
end if
end while

print "Computer wins."
```
Output:
```Nim Game
Starting with 12 tokens.

How many tokens would you like to take? 0
Take must be between 1 and 3.
How many tokens would you like to take? 1
Player takes 1 tokens.
11 tokens remaining.

Computer takes 3 tokens.
8 tokens remaining.

How many tokens would you like to take? 2
Player takes 2 tokens.
6 tokens remaining.

Computer takes 2 tokens.
4 tokens remaining.

How many tokens would you like to take? 2
Player takes 2 tokens.
2 tokens remaining.

Computer takes 2 tokens.
0 tokens remaining.

Computer wins.```

## Nim

```import strutils
import terminal

var tokens = 12

styledEcho(styleBright, "Nim in Nim\n")

proc echoTokens() =
styledEcho(styleBright, "Tokens remaining: ", resetStyle, \$tokens, "\n")

proc player() =
var take = '0'
echo "How many tokens will you take?"
while true:
stdout.styledWrite(styleDim, "Take (1–3): ", resetStyle)
take = getch()
stdout.write(take, '\n')
if take in {'1'..'3'}:
tokens -= parseInt(\$take)
break
else:
echo "Please choose a number between 1 and 3."
echoTokens()

proc computer() =
styledEcho(styleBright, "- Computer's turn -")
let take = tokens mod 4
tokens -= take
styledEcho("Computer took ", styleBright, \$take, " ",
if take == 1: "token"
else: "tokens")
echoTokens()

while tokens > 0:
player()
computer()

styledEcho(styleBright, "Computer wins!")
```
Output:
```- Your turn -
How many tokens will you take?
Take (1–3): 1
Tokens remaining: 11

- Computer's turn -
Computer took 3 tokens
Tokens remaining: 8

How many tokens will you take?
Take (1–3): 2
Tokens remaining: 6

- Computer's turn -
Computer took 2 tokens
Tokens remaining: 4

How many tokens will you take?
Take (1–3): 3
Tokens remaining: 1

- Computer's turn -
Computer took 1 token
Tokens remaining: 0

Computer wins!```

## OCaml

Translation of: Python – with plurals added, loops turned to recursion and string input handled
```let rec player_turn () =
print_string "How many tokens would you like to take? ";
let n = read_int_opt () |> Option.value ~default:0 in
if n >= 1 && n <= 3 then n
else (
print_endline "Number must be between 1 and 3";
player_turn ())

let computer_turn tokens = tokens mod 4

let plural_suffix = function 1 -> "" | _ -> "s"

let turn_report prefix taken tokens =
Printf.printf "%s %d token%s.\n%d token%s remaining.\n%!" prefix taken
(plural_suffix taken) tokens (plural_suffix tokens)

let rec play_game tokens =
let player_tokens = player_turn () in
let tokens = tokens - player_tokens in
turn_report "You take" player_tokens tokens;
let computer_tokens = computer_turn tokens in
let tokens = tokens - computer_tokens in
turn_report "Computer takes" computer_tokens tokens;
if tokens = 0 then print_endline "Computer wins!" else play_game tokens

let () = play_game 12
```
Output:
```How many tokens would you like to take? 3
You take 3 tokens.
9 tokens remaining.
Computer takes 1 token.
8 tokens remaining.
How many tokens would you like to take? 3
You take 3 tokens.
5 tokens remaining.
Computer takes 1 token.
4 tokens remaining.
How many tokens would you like to take? 3
You take 3 tokens.
1 token remaining.
Computer takes 1 token.
0 tokens remaining.
Computer wins!
```

## Pascal

Works with: Free Pascal
```program Nim;

{\$mode objfpc}{\$H+}

uses
sysutils;

const
maxtokens = 12;
machine = 0;
human = 1;

var
player, tokens, taken : integer;

procedure Welcome;
begin
writeln('The Game of Nim');
writeln;
writeln('This is one of many variants of the classic game of');
writeln('takes between 1 and 3 tokens. The player who takes');
writeln('the last token wins.');
writeln;
end;

procedure ShowRemaining(n : integer);
begin
writeln('Available tokens: ', n);
end;

function getnum(lowlim, toplim : integer) : integer ;
var
n : integer;
ok : boolean;
begin
repeat
write('You take: ');
if (n < lowlim) or (n > toplim) then
begin
writeln('Must take between ',lowlim,' and ',toplim);
write('Try again: ');
ok := false;
end
else
ok := true;
until ok;
getnum := n;
end;

function PlayTurn(player, taken, tokens : integer) : integer;
begin
if player = human then
taken := getnum(1,3)
else   { machine's move this time }
begin
if tokens <= 3 then
taken := tokens     { take all if 3 or less remain }
else
taken := 4 - taken; { othewise, follow winning strategy }
end;
PlayTurn := taken;
end;

procedure Report(winner : integer);
begin
if winner = human then
writeln('You took the last one, so you win. Congratulations!')
else
writeln('I took the last one, so I win. Sorry about that.');
end;

begin
Welcome;
tokens := maxtokens;
taken := 0;
player := human;
writeln('You go first');
repeat
ShowRemaining(tokens);
taken := PlayTurn(player, taken, tokens);
if player = machine then writeln('I took: ',taken);
tokens := tokens - taken;
if tokens > 0 then player := 1 - player;
until tokens <= 0;
report(player);
writeln('Thanks for playing!');
end.
```
Output:
```The Game of Nim

This is one of many variants of the classic game of
takes between 1 and 3 tokens. The player who takes
the last token wins.

You go first
Available tokens: 12
You take: 4
Must take between 1 and 3
Try again: 3
Available tokens: 9
I took: 1
Available tokens: 8
You take: 2
Available tokens: 6
I took: 2
Available tokens: 4
You take: 1
Available tokens: 3
I took: 3
I took the last one, so I win. Sorry about that.
Thanks for playing!
```

## Pebble

```;NIM game example program for x86 DOS
;Compiles with Pebble to com file under 1kb.

program examples\nim

data

int tokens[12]
int take[0]

begin

call intro

label gameloop

echo "There are"
echo [tokens]
echo " tokens remaining."
crlf
echo "How many would you like to take? "
input [take]

if [take] > 3 | [take] < 1 then

echo "You must take between 1 to 3 tokens."

endif

if [take] <= 3 & [take] >= 1 then

[tokens] = [tokens] - [take]

if [tokens] = 0 then

bell
echo "Congratulations. You got the last token."
pause
kill

endif

[take] = 4 - [take]

echo "I will take"
echo [take]
echo " tokens.
[tokens] = [tokens] - [take]

if [tokens] = 0 then

echo "I got the last token. I win. Better luck next time."
pause
kill

endif

endif

goto gameloop

end

sub intro

cls
echo "NIM game"
crlf

ret```

## Perl

Translation of: Raku
```use strict;
use warnings;
use feature 'say';

my \$tokens = 12;
say "\$tokens tokens remaining.\n";

while (1) {
print "How many tokens do you want to remove; 1, 2 or 3? : ";
(my \$player = <>) =~ s/\s//g;
say "Nice try. \$tokens tokens remaining.\n" and next
unless \$player =~ /^[123]\$/;
\$tokens -= 4;
say "Computer takes @{[4 - \$player]}.\n\$tokens tokens remaining.\n";
say "Computer wins." and last
if \$tokens <= 0;
}
```
Output:
```12 tokens remaining.

How many tokens do you want to remove; 1, 2 or 3? : 3
Computer takes 1.
8 tokens remaining.

How many tokens do you want to remove; 1, 2 or 3? : -1
Nice try. 8 tokens remaining.

How many tokens do you want to remove; 1, 2 or 3? : 2
Computer takes 2.
4 tokens remaining.

How many tokens do you want to remove; 1, 2 or 3? : 1
Computer takes 3.
0 tokens remaining.

Computer wins.```

## Phix

Translation of: Raku
```without js -- getc
integer tokens = 12, player = 0

while true do
printf(1,"%2d tokens remaining. ",tokens)
if tokens=0 then printf(1,"Computer wins.\n") exit end if
printf(1,"How many tokens do you want to remove; 1, 2, or 3?:")
while player<1 or player>3 do player=getc(0)-'0' end while
printf(1,"%d. Computer takes %d.\n",{player,4-player})
tokens -= 4; player = 0
end while
```
Output:
```12 tokens remaining. How many tokens do you want to remove; 1, 2, or 3?:1. Computer takes 3.
8 tokens remaining. How many tokens do you want to remove; 1, 2, or 3?:2. Computer takes 2.
4 tokens remaining. How many tokens do you want to remove; 1, 2, or 3?:3. Computer takes 1.
0 tokens remaining. Computer wins.
```

## Pike

Translation of: Python
```int tokens = 12;

void get_tokens(int cur_tokens) {
write("How many tokens would you like to take? ");
int take = (int)Stdio.stdin->gets();

if (take < 1 || take > 3) {
write("Number must be between 1 and 3.\n");
get_tokens(cur_tokens);
}
else {
tokens = cur_tokens - take;
write("You take " + (string)take + " tokens\n");
write((string)tokens + " tokens remaing\n\n");
}
}

void comp_turn(int cur_tokens) {
int take = cur_tokens % 4;
tokens = cur_tokens - take;
write("Computer take " + (string)take + " tokens\n");
write((string)tokens + " tokens remaing\n\n");
}

int main() {
write("Pike Nim\n\n");
while(tokens > 0) {
get_tokens(tokens);
comp_turn(tokens);
}
write("Computer wins!\n");
return 0;
}
```
Output:
```Pike Nim

How many tokens would you like to take? 2
You take 2 tokens
10 tokens remaing

Computer take 2 tokens
8 tokens remaing

How many tokens would you like to take? 6
Number must be between 1 and 3.
How many tokens would you like to take? -2
Number must be between 1 and 3.
How many tokens would you like to take? 1
You take 1 tokens
7 tokens remaing

Computer take 3 tokens
4 tokens remaing

How many tokens would you like to take? 3
You take 3 tokens
1 tokens remaing

Computer take 1 tokens
0 tokens remaing

Computer wins!
```

## Plain English

```To run:
Start up.
Play the game of Nim.
Write "The computer wins! Press esc to exit." on the console.
Wait for the escape key.
Shut down.

A piece is a number.

To play the game of Nim:
Put 12 into a piece count.
Loop.
If the piece count is 0, exit.
Write "There are " then the piece count then " pieces remaining." on the console.
Ask the player to take some pieces.
Subtract the pieces from the piece count.
Ask the computer to take some other pieces given the pieces.
Subtract the other pieces from the piece count.
Repeat.

To ask the player to take some pieces:
Write "Would you like to take 1, 2, or 3 pieces? " on the console without advancing.
Read a count from the console.
If the count is not between 1 and 3, repeat.
Format the count and "piece" or "pieces" into a string.
Write "You took " then the string then "." on the console.
Put the count into the pieces.

To ask the computer to take some pieces given some other pieces:
Put 4 minus the other pieces into a count.
Format the count and "piece" or "pieces" into a string.
Write "The computer took " then the string then "." on the console.
Put the count into the pieces.```
Output:
```There are 12 pieces remaining.
Would you like to take 1, 2, or 3 pieces? apple
Would you like to take 1, 2, or 3 pieces? 4
Would you like to take 1, 2, or 3 pieces? 2
You took 2 pieces.
The computer took 2 pieces.
There are 8 pieces remaining.
Would you like to take 1, 2, or 3 pieces? 3
You took 3 pieces.
The computer took 1 piece.
There are 4 pieces remaining.
Would you like to take 1, 2, or 3 pieces? 1
You took 1 piece.
The computer took 3 pieces.
The computer wins! Press esc to exit.
```

## Prolog

```nim :- next_turn(12), !.

next_turn(N) :-
% Player Turn
format('How many dots would you like to take? '),
number_codes(PlayerGuess, Line),
member(PlayerGuess,[1,2,3]),
N1 is N - PlayerGuess,
format('You take ~d dots~n~d dots remaining.~n~n', [PlayerGuess, N1]),

% Computer Turn
CompGuess is 4 - PlayerGuess,
N2 is N1 - CompGuess,
format('Computer takes ~d dots~n~d dots remaining.~n~n', [CompGuess, N2]),
(
N2 = 0
-> format('Computer wins!')
; next_turn(N2)
).
```
Output:
```?- nim.
How many dots would you like to take? 2
You take 2 dots
10 dots remaining.

Computer takes 2 dots
8 dots remaining.

How many dots would you like to take? 3
You take 3 dots
5 dots remaining.

Computer takes 1 dots
4 dots remaining.

How many dots would you like to take? 1
You take 1 dots
3 dots remaining.

Computer takes 3 dots
0 dots remaining.

Computer wins!
true.

?-```

## Python

Works on Python 3

```print("Py Nim\n")

def getTokens(curTokens):
global tokens

print("How many tokens would you like to take? ", end='')
take = int(input())

if (take < 1 or take > 3):
print("Number must be between 1 and 3.\n")
getTokens(curTokens)
return

tokens = curTokens - take
print(f'You take {take} tokens.')
print(f'{tokens} tokens remaining.\n')

def compTurn(curTokens):
global tokens

take = curTokens % 4
tokens = curTokens - take
print (f'Computer takes {take} tokens.')
print (f'{tokens} tokens remaining.\n')

tokens = 12
while (tokens > 0):
getTokens(tokens)
compTurn(tokens)

print("Computer wins!")
```
Output:
```Py Nim

How many tokens would you like to take? 2
You take 2 tokens.
10 tokens remaining.

Computer takes 2 tokens.
8 tokens remaining.

How many tokens would you like to take? 1
You take 1 tokens.
7 tokens remaining.

Computer takes 3 tokens.
4 tokens remaining.

How many tokens would you like to take? 3
You take 3 tokens.
1 tokens remaining.

Computer takes 1 tokens.
0 tokens remaining.

Computer wins!
```

## Quackery

```  [ \$ "Take how many tokens? (1-3) "
input
trim reverse
trim reverse
\$->n
not iff drop again
dup 1 4 within
not iff drop again ]             is getmove ( --> n )

[ 12
[ say "There are "
dup echo
say " tokens." cr cr
getmove tuck -
4 rot - dup
cr say "Computer takes "
echo
say "." cr cr
-
dup 0 = until ]
drop
say "Computer wins." cr ]        is play    ( -->   )```
Output:

As a dialogue in the Quackery shell.

```/O> play
...
There are 12 tokens.

Take how many tokens? (1-3) 1

Computer takes 3.

There are 8 tokens.

Take how many tokens? (1-3) 2

Computer takes 2.

There are 4 tokens.

Take how many tokens? (1-3) 3

Computer takes 1.

Computer wins.

Stack empty.
```

## R

```## Nim game
##

tokens <- 12

while(tokens > 0) {
print(paste("Tokens remaining:",tokens))
playertaken <- 0
while(playertaken == 0) {
playeropts <- c(1:min(c(tokens,3)))
playertaken <- menu(playeropts, title = "Your go, how many tokens will you take? ")
tokens <- tokens - playertaken
if(tokens == 0) {print("Well done you won, that shouldn't be possible!")}
}
cputaken <- 4 - playertaken
tokens <- tokens - cputaken
print(paste("I take",cputaken,"tokens,",tokens,"remain"))
if(tokens == 0) {print("I win!")}

}
```
Output:
```[1] "Tokens remaining: 12"
Your go, how many tokens will you take?

1: 1
2: 2
3: 3

Selection: 3
[1] "I take 1 tokens, 8 remain"
[1] "Tokens remaining: 8"
Your go, how many tokens will you take?

1: 1
2: 2
3: 3

Selection: 3
[1] "I take 1 tokens, 4 remain"
[1] "Tokens remaining: 4"
Your go, how many tokens will you take?

1: 1
2: 2
3: 3

Selection: 3
[1] "I take 1 tokens, 0 remain"
[1] "I win!"
```

## Racket

```#lang racket

(define (print-remaining tokens-remaining)
(printf "~a tokens remain.\n" tokens-remaining))

(cond
[(and (natural? num) (< num 4)) num]
[else
(display "Please enter a number between 1 to 3\n")

(define (pturn tokens-remaining)
(cond
[(not (zero? tokens-remaining))
(print-remaining tokens-remaining)
(display "Your turn. How many tokens? ")
(cturn (- tokens-remaining n) n)]
[else (display "Computer wins!")]))

(define (cturn tokens-remaining p-took)
(cond
[(not (zero? tokens-remaining))
(print-remaining tokens-remaining)
(define c-take (- 4 p-took))
(printf "Computer takes ~a tokens\n" c-take)
(pturn (- tokens-remaining c-take))]
[else (display "You win!")]))

(pturn 12)
```

## Raku

(formerly Perl 6)

Works with: Rakudo version 2019.03
```say my \$tokens = 12, " tokens remaining.\n";

loop {
my \$player = trim prompt "How many tokens do you want to remove; 1, 2 or 3? : ";
say "Nice try. \$tokens tokens remaining.\n" and
next unless \$player eq any <1 2 3>;
\$tokens -= 4;
say "Computer takes {4 - \$player}.\n\$tokens tokens remaining.\n";
say "Computer wins." and last if \$tokens <= 0;
}
```
Sample output:
```12 tokens remaining.

How many tokens do you want to remove; 1, 2 or 3? : 3
Computer takes 1.
8 tokens remaining.

How many tokens do you want to remove; 1, 2 or 3? : 6
Nice try. 8 tokens remaining.

How many tokens do you want to remove; 1, 2 or 3? : G
Nice try. 8 tokens remaining.

How many tokens do you want to remove; 1, 2 or 3? : 2
Computer takes 2.
4 tokens remaining.

How many tokens do you want to remove; 1, 2 or 3? : 1
Computer takes 3.
0 tokens remaining.

Computer wins.```

## Red

```Red [
date: 2021-10-24
version: 0.6.4
summary: "Demonstrate the game of Nim in Red for Rosetta Code"
]

take-tokens: function [
"Ask the user to take between 1 and 3 tokens."
][
forever [
n: trim ask "Would you like to take 1, 2, or 3 tokens (q to quit)? "
if n = "q" [quit]
n: try [to-integer n]
case [
not integer? n [print "Please enter an integer."]
any [n < 1 n > 3] [print "Please enter a number between 1 and 3."]
true [return n]
]
]
]

tokens: 12
while [tokens > 0][
print ["There are" tokens "tokens remaining."]
n: take-tokens
print ["You took" n "tokens."]
tokens: tokens - n
print ["Computer takes" 4 - n "tokens."]
tokens: subtract tokens subtract 4 n
]
print "Computer wins!"
```
Output:
```There are 12 tokens remaining.
Would you like to take 1, 2, or 3 tokens (q to quit)? 2
You took 2 tokens.
Computer takes 2 tokens.
There are 8 tokens remaining.
Would you like to take 1, 2, or 3 tokens (q to quit)? 3
You took 3 tokens.
Computer takes 1 tokens.
There are 4 tokens remaining.
Would you like to take 1, 2, or 3 tokens (q to quit)? 4
Please enter a number between 1 and 3.
Would you like to take 1, 2, or 3 tokens (q to quit)? apple
Would you like to take 1, 2, or 3 tokens (q to quit)? 1
You took 1 tokens.
Computer takes 3 tokens.
Computer wins!
```

## REXX

Programming notes:   extra error checking was done with specific informative error messages.   Also included was a method of quitting the game.   The number of (starting) tokens   (the pot)   can be specified on the command line,   the default is   12.

```/*REXX program plays the NIM game with a human opponent; the pot size can be specified. */
parse arg pot _ . 1 __                           /*obtain optional argument from the CL.*/
if pot=='' | pot==","  then pot= 12              /*Not specified?  Then use the default.*/
if _\==''       then do; call ser "Too many arguments entered: "    __;     exit 13;   end
if \isNum(pot)  then do; call ser "argument isn't numeric: "       pot;     exit 13;   end
if \isInt(pot)  then do; call ser "argument isn't an integer: "    pot;     exit 13;   end
if pot<4        then do; call ser "The pot number is too small: "  pot;     exit 13;   end
if pot>100      then do; call ser "The pot number is too large: "  pot;     exit 13;   end
pad= copies('─', 8)                              /*literal used as an eyecatcher in msgs*/
pot= pot/1                                       /*normalize the pot  (number).         */
t= pot//4
if pot>12 & t\==0  then do;        say pad 'The computer takes '      t      " token"s(t).
pot= pot - t
end

do forever;   call show pot
do  until ok;                   ok= 1;              say
say pad "How many tokens do you want to take away  (1, 2, or 3)    (or QUIT)?"
parse pull t _ . 1 q 1 __;      upper q;            say
if abbrev('QUIT',q,1)  then do;  say pad 'Quitting.';         exit 1;      end
if t=''                then call ser "No arguments entered."
if _\==''              then call ser "Too many arguments entered: "        __
if \isNum(t)           then call ser "Argument isn't numeric: "             t
if \isInt(t)           then call ser "Argument isn't an integer: "          t
if t<1                 then call ser "Argument can't be less than 1: "      t
if t>3                 then call ser "Argument can't be greater than 3: "   t
end   /*while*/
t= t/1                                      /*Normalize the number:  001   2.  +3  */
#= max(1, 4-t)                              /*calculate the computer's take─away.  */
say pad 'The computer takes '    #    " token"s(#).
pot= pot - t - #                            /*calculate the number of tokens in pot*/
if pot==0  then do;   say pad 'No tokens left.'       /*No tokens left in the pot? */
say pad "The computer wins!"    /*Display a braggart message.*/
exit                            /*exit this computer program.*/
end
end   /*forever*/                           /*keep looping until there's a winner. */
exit                                             /*stick a fork in it,  we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
isNum: return datatype( arg(1), 'N')             /*verify that the arg is a  number.    */
isInt: return datatype( arg(1), 'W')             /*   "     "   "   "   " an integer.   */
show:  say;  say pad "Tokens remaining: "  arg(1)' ' pad;  say;  return
s:     if arg(1)==1  then return arg(3);                         return word(arg(2) 's',1)
ser:   if ok  then say pad '***error***' arg(1);       ok= 0;    return
```
output   when using the default input:
```──────── Tokens remaining:  12  ────────

──────── How many tokens do you want to take away  (1, 2, or 3)    (or QUIT)?
2                                            ◄■■■■■■■■■■■ user input

──────── The computer takes  2  tokens.

──────── Tokens remaining:  8  ────────

──────── How many tokens do you want to take away  (1, 2, or 3)    (or QUIT)?
3                                            ◄■■■■■■■■■■■ user input

──────── The computer takes  1  token.

──────── Tokens remaining:  4  ────────

──────── How many tokens do you want to take away  (1, 2, or 3)    (or QUIT)?
1                                            ◄■■■■■■■■■■■ user input

──────── The computer takes  3  tokens.
──────── No tokens left.
──────── The computer wins!
```

## Ring

```# Project : CalmoSoft Nim Game
# Date    : 16/04/2020-13:27:07
# Update  : 31/03/2021-19:41:09
# Author  : Gal Zsolt (~ CalmoSoft ~)
# Email   : <calmosoft@gmail.com>

limit = 4
limit1 = 1
limit2 = 3
limit3 = 5
limit4 = 7

match1 = limit1
match2 = limit2
match3 = limit3
match4 = limit4

move1 = 0
move2 = 0
move3 = 0
move4 = 0

Button1 = list(limit1)
Button2 = list(limit2)
Button3 = list(limit3)
Button4 = list(limit4)

pcMove = 0

width = 60
height = 60

yourScore = 0
pcScore = 0

C_FONTSIZE = 15
C_NIM = "images/nim.jpg"
C_COMPUTER = "images/computer.jpg"
C_PROGRAMMER = "images/programmer.jpg"

app = new qApp
{
win = new qWidget() {
app.StyleFusionBlack()
setWindowTitle('CalmoSoft Nim Game')
setWinIcon(self,"images/nim.jpg")
setWindowFlags(Qt_SplashScreen | Qt_CustomizeWindowHint)
reSize(620,460)

for Col = 1 to limit1
Button1[Col] = new QPushButton(win) {
y = 230+(Col-1)*height
setgeometry(y+10,70,width,height)
setSizePolicy(1,1)
seticon(new qicon(new qpixmap(C_NIM)))
setIconSize(new qSize(60,60))
}
next

for Col = 1 to limit2
Button2[Col] = new QPushButton(win) {
y = 170+(Col-1)*height
setgeometry(y+10,150,width,height)
setSizePolicy(1,1)
seticon(new qicon(new qpixmap(C_NIM)))
setIconSize(new qSize(60,60))
}
next

for Col = 1 to limit3
Button3[Col] = new QPushButton(win) {
y = 110+(Col-1)*height
setgeometry(y+10,230,width,height)
setSizePolicy(1,1)
seticon(new qicon(new qpixmap(C_NIM)))
setIconSize(new qSize(60,60))
}
next

for Col = 1 to limit4
Button4[Col] = new QPushButton(win) {
y = 50+(Col-1)*height
setgeometry(y+10,310,width,height)
setSizePolicy(1,1)
seticon(new qicon(new qpixmap(C_NIM)))
setIconSize(new qSize(60,60))
}
next

Row1 = new QPushButton(win) {
setgeometry(500,70,width,height)
setStyleSheet("color:Black;background-color:Orange")
setSizePolicy(1,1)
setclickevent("deleteRow1()")
settext("Row1") }

Row2 = new QPushButton(win) {
setgeometry(500,150,width,height)
setStyleSheet("color:Black;background-color:Orange")
setSizePolicy(1,1)
setclickevent("deleteRow2()")
settext("Row2") }

Row3 = new QPushButton(win) {
setgeometry(500,230,width,height)
setStyleSheet("color:Black;background-color:Orange")
setSizePolicy(1,1)
setclickevent("deleteRow3()")
settext("Row3") }

Row4 = new QPushButton(win) {
setgeometry(500,310,width,height)
setStyleSheet("color:Black;background-color:Orange")
setSizePolicy(1,1)
setclickevent("deleteRow4()")
settext("Row4") }

labelYourScore = new QLabel(win) { setgeometry(60,20,150,30)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))

labelComputerScore = new QLabel(win) { setgeometry(350,20,150,30)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
settext("PC score: 0") }

btnNewGame = new QPushButton(win) { setgeometry(60,400,80,30)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
settext("New")
setclickevent("newGame()") }

btnExit = new QPushButton(win) { setgeometry(400,400,80,30)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
settext("Exit")
setclickevent("pQuit()") }

btnPcMove = new QPushButton(win) { setgeometry(200,400,140,30)
setFont(new qFont("Verdana",C_FONTSIZE,50,0))
settext("PC move")
setclickevent("pcMove()") }

show()
}
exec()
}

func deleteRow1()
if move2 = 1 or move3 = 1 or move4 = 1
move1 = 0
return
else
move1 = 1
ok
if (match1 > 0) and (move1 = 1)
if pcMove = 1
Button1[match1] { seticon(new qicon(new qpixmap(C_COMPUTER)))
setIconSize(new qSize(55,55))
setenabled(false) }
match1 = match1 - 1
move1 = 0
ok

if pcMove = 0
Button1[match1] { seticon(new qicon(new qpixmap(C_PROGRAMMER)))
setIconSize(new qSize(55,55))
setenabled(false) }
match1 = match1 - 1
ok
gameOver()
ok

func deleteRow2()
if move1 = 1 or move3 = 1 or move4 = 1
move2 = 0
return
else
move2 = 1
ok
if match2 > 0 and move2 = 1
if pcMove = 1
Button2[match2] { seticon(new qicon(new qpixmap(C_COMPUTER)))
setIconSize(new qSize(55,55))
setenabled(false) }
match2 = match2 - 1
move2 = 0
ok

if pcMove = 0
Button2[match2] { seticon(new qicon(new qpixmap(C_PROGRAMMER)))
setIconSize(new qSize(55,55))
setenabled(false) }
match2 = match2 - 1
ok
gameOver()
ok

func deleteRow3()
if move1 = 1 or move2 = 1 or move4 = 1
move3 = 0
return
else
move3 = 1
ok
if match3 > 0 and move3 = 1
if pcMove = 1
Button3[match3] { seticon(new qicon(new qpixmap(C_COMPUTER)))
setIconSize(new qSize(55,55))
setenabled(false) }
match3 = match3 - 1
move3 = 0
ok

if pcMove = 0
Button3[match3] { seticon(new qicon(new qpixmap(C_PROGRAMMER)))
setIconSize(new qSize(55,55))
setenabled(false) }
match3 = match3 - 1
ok
gameOver()
ok

func deleteRow4()
if move1 = 1 or move2 = 1 or move3 = 1
move4 = 0
return
else
move4 = 1
ok
if match4 > 0 and move4 = 1
if pcMove = 1
Button4[match4] { seticon(new qicon(new qpixmap(C_COMPUTER)))
setIconSize(new qSize(55,55))
setenabled(false) }
match4 = match4 - 1
move4 = 0
ok

if pcMove = 0
Button4[match4] { seticon(new qicon(new qpixmap(C_PROGRAMMER)))
setIconSize(new qSize(55,55))
setenabled(false) }
match4 = match4 - 1
ok
gameOver()
ok

func pcMove()

move1 = 0
move2 = 0
move3 = 0
move4 = 0
pcMove = 1
for n = 1 to limit
if match1 > 0
rnd = random(match1-1)+1
for m = 1 to rnd
deleteRow1()
next
exit
ok

if match2 > 0
rnd = random(match2-1)+1
for m = 1 to rnd
deleteRow2()
next
exit
ok

if match3 > 0
rnd = random(match3-1)+1
for m = 1 to rnd
deleteRow3()
next
exit
ok

if match4 > 0
rnd = random(match4-1)+1
for m = 1 to rnd
deleteRow4()
next
exit
ok
next
pcMove = 0

func gameOver()
if (match1 = 0) and (match2 = 0) and (match3 = 0) and (match4 = 0)
if pcMove = 0
pcScore = pcScore + 1
labelComputerScore.settext("PC score: " + string(pcScore))
msgBox("Game Over! You Lost!")
else
yourScore = yourScore + 1
msgBox("Game Over! You Win!")
ok
ok

func newGame()

match1 = limit1
match2 = limit2
match3 = limit3
match4 = limit4

move1 = 0
move2 = 0
move3 = 0
move4 = 0

pcMove = 0

for Col = 1 to limit1
Button1[Col] = new QPushButton(win) {
y = 230+(Col-1)*height
setgeometry(y+10,70,width,height)
setSizePolicy(1,1)
seticon(new qicon(new qpixmap(C_NIM)))
setIconSize(new qSize(60,60))
show()
}
next

for Col = 1 to limit2
Button2[Col] = new QPushButton(win) {
y = 170+(Col-1)*height
setgeometry(y+10,150,width,height)
setSizePolicy(1,1)
seticon(new qicon(new qpixmap(C_NIM)))
setIconSize(new qSize(60,60))
show()
}
next

for Col = 1 to limit3
Button3[Col] = new QPushButton(win) {
y = 110+(Col-1)*height
setgeometry(y+10,230,width,height)
setSizePolicy(1,1)
seticon(new qicon(new qpixmap(C_NIM)))
setIconSize(new qSize(60,60))
show()
}
next

for Col = 1 to limit4
Button4[Col] = new QPushButton(win) {
y = 50+(Col-1)*height
setgeometry(y+10,310,width,height)
setSizePolicy(1,1)
seticon(new qicon(new qpixmap(C_NIM)))
setIconSize(new qSize(60,60))
show()
}
next

func msgBox(cText)
mb = new qMessageBox(win) {
setWindowTitle('CalmoSoft Nim Game')
setText(cText)
setstandardbuttons(QMessageBox_OK)
result = exec()
}

func pQuit()
win.close()
app.Quit()```

Necessary image files: Images file

Output:

Nim Game - video

## RPL

This task is an opportunity to showcase the use of both persistent variables and local variables, the latter vanishing once the program executed. The computer has been named "HAL" rather than "Player 2" or "Computer" to keep the message length under 16 characters, which is the width of the HP-28 display. To play, initialize the game by entering the word `NUNIM`, then input your moves followed by the word `PLNIM` until you will lose. The case for a human win is nevertheless coded to appear as a a fair game.

Works with: Halcyon Calc version 4.2.7
```≪  "Tokens = " tokens →STR +
"1..3 PLNIM?"
≫
'DispN' STO
```
```≪ CLEAR 12 'tokens' STO        // emptying the stack and creating a persistent variable
DispN
≫
'NUNIM' STO
```
```≪ → move                     // creating a local variable, with value = content of stack level 1:
≪ IF { 1 2 3 } move POS
THEN
"You take " move →STR +
'tokens' move STO-    // substracting the value of a local variable from a persistent variable directly
IF tokens 0 ≤
THEN "You win!"
ELSE
4 move - tokens MIN "HAL takes " OVER →STR + 'tokens' ROT STO-
IF tokens 0 ≤ THEN DROP "HAL wins!" ELSE DispN END
END
ELSE move →STR " is illegal" + DispN
END
≫  ≫
'PLNIM' STO  // 67 words, 4% stack
```
```NUNIM
3 PLNIM
4 PLNIM
2 PLNIM
2 PLNIM
```
Output:
```15: "Tokens = 12"
14: "1..3 PLNIM?"
13: "You take 3"
12: "HAL takes 1"
11: "Tokens = 8"
10: "1..3 PLNIM?"
9:  "4 is illegal"
8:  "Tokens = 8"
7:  "1..3 PLNIM?"
6:  "You take 2"
5:  "HAL takes 2"
4:  "Tokens = 4"
3:  "1..3 PLNIM?"
2:  "You take 2"
1:  "HAL wins!"
```

## Ruby

```[12, 8, 4].each do |remaining|
puts "There are #{remaining} dots.\nHow many dots would you like to take? "
unless (num=gets.to_i).between?(1, 3)
puts "Please enter one of 1, 2 or 3"
redo
end
puts "You took #{num} dots, leaving #{remaining-num}.\nComputer takes #{4-num}.\n\n"
end

puts "Computer took the last and wins."
```
Output:
```There are 12 dots.
How many dots would you like to take?
foo
Please enter one of 1, 2 or 3
There are 12 dots.
How many dots would you like to take?
1
You took 1 dots, leaving 11.
Computer takes 3.

There are 8 dots.
How many dots would you like to take?
3
You took 3 dots, leaving 5.
Computer takes 1.

There are 4 dots.
How many dots would you like to take?
2
You took 2 dots, leaving 2.
Computer takes 2.

Computer took the last and wins.
```

## Rust

```fn main() {
let mut tokens = 12;
println!("Nim game");
println!("Starting with {} tokens.", tokens);
println!("");

loop {
tokens = p_turn(&tokens);
print_remaining(&tokens);
tokens = c_turn(&tokens);
print_remaining(&tokens);

if tokens == 0 {
println!("Computer wins!");
break;
}
}
}

fn p_turn(tokens: &i32) -> i32 {
loop {  //try until we get a good number
println!("How many tokens would you like to take?");

let mut take = String::new();
.expect("Sorry, I didn't understand that.");

let take: i32 = match take.trim().parse() {
Ok(num) => num,
Err(_) => {
println!("Invalid input");
println!("");
continue;
}
};

if take > 3 || take < 1 {
println!("Take must be between 1 and 3.");
println!("");
continue;
}

}
}

fn c_turn(tokens: &i32) -> i32 {
let take = tokens % 4;

println!("Computer takes {} tokens.", take);

}

fn print_remaining(tokens: &i32) {
println!("{} tokens remaining.", tokens);
println!("");
}
```
Output:

sample game:

```Nim game
Starting with 12 tokens.

How many tokens would you like to take?
foo
Invalid input

How many tokens would you like to take?
3
9 tokens remaining.

Computer takes 1 tokens.
8 tokens remaining.

How many tokens would you like to take?
5
Take must be between 1 and 3.

How many tokens would you like to take?
2
6 tokens remaining.

Computer takes 2 tokens.
4 tokens remaining.

How many tokens would you like to take?
1
3 tokens remaining.

Computer takes 3 tokens.
0 tokens remaining.

Computer wins!
```

## Scala

```var tokens = 12

def playerTurn(curTokens: Int): Unit =
{
val take = readLine("How many tokens would you like to take? ").toInt
if (take < 1 || take > 3) {
println("Number must be between 1 and 3.")
playerTurn(curTokens)
}
else {
tokens = curTokens - take
println(s"You take \$take tokens. \$tokens tokens remaining.\n")
}
}

def compTurn(curTokens: Int): Unit =
{
val take = curTokens % 4
tokens = curTokens - take
println(s"Computer takes \$take tokens. \$tokens remaining.\n")
}

def main(args: Array[String]): Unit =
{
while (tokens > 0)
{
playerTurn(tokens)
compTurn(tokens)
}
println("Computer wins!")
}
```

## Smalltalk

Works with: GNU Smalltalk
```Object subclass: Nim [
| tokens |
<comment: 'I am a game of nim'>
Nim class >> new [
<category: 'instance creation'>
^(super new) init: 12
]

init: t [
<category: 'instance creation'>
tokens := t.
^self
]

pTurn [
| take |
<category: 'gameplay'>
Transcript nextPutAll: 'How many tokens will you take?: '.
take := (stdin nextLine) asNumber.
((take < 1) | (take > 3))
ifTrue: [Transcript nextPutAll: 'Invalid input';nl;nl. self pTurn]
ifFalse: [tokens := tokens - take]
]

cTurn [
| take |
<category: 'gameplay'>
take := tokens - (4 * (tokens // 4)).    "tokens % 4"
Transcript nextPutAll: 'Computer takes '.
take printOn: Transcript.
Transcript nextPutAll: ' tokens';nl.
tokens := tokens - take
]

mainLoop [
<category: 'main loop'>
Transcript nextPutAll: 'Nim game';nl.
Transcript nextPutAll: 'Starting with '.
tokens printOn: Transcript.
Transcript nextPutAll: ' tokens';nl;nl.
1 to: 3 do: [ :n |    "The computer always wins on the 3rd turn"
self pTurn.
self printRemaining.
self cTurn.
self printRemaining.
(tokens = 0)
ifTrue:[Transcript nextPutAll: 'Computer wins!';nl. ^0]
]
]

printRemaining [
<category: 'information'>
tokens printOn: Transcript.
Transcript nextPutAll: ' tokens remaining';nl;nl
]
]

g := Nim new.
g mainLoop.
```
Output:

sample game:

```Nim game
Starting with 12 tokens

How many tokens will you take?: foo
Invalid input

How many tokens will you take?: 3
9 tokens remaining

Computer takes 1 tokens
8 tokens remaining

How many tokens will you take?: 4
Invalid input

How many tokens will you take?: 2
6 tokens remaining

Computer takes 2 tokens
4 tokens remaining

How many tokens will you take?: 1
3 tokens remaining

Computer takes 3 tokens
0 tokens remaining

Computer wins!
```

## SNOBOL4

Works with: CSNOBOL4
```  &TRIM = 1
&DUMP = 1

OUTPUT(.prompt, 9, 'T', '-')

********************************************************************************
* GETCOUNT() - Get the count of tokens to take.
********************************************************************************
define('GETCOUNT()I')
:(GETCOUNT.END)
GETCOUNT         OUTPUT = 'Enter a number between 1 and 3, blank line to exit.'
****************************************
* Data input and integrity check loop.
****************************************
GETCOUNT.LOOP    PROMPT = '> '
i = trim(INPUT)
*                Abort on nil entry.
eq(size(i), 0)                                                 :S(EXIT)
*                Check range.
integer(i)                                                     :F(GETCOUNT.INVALID)
lt(i, 4)                                                       :F(GETCOUNT.INVALID)
gt(i, 0)                                                       :F(GETCOUNT.INVALID)
*                It all checked out.
GETCOUNT = i                                                   :(RETURN)
****************************************
* An invalid entry was caught.
****************************************
GETCOUNT.INVALID OUTPUT = 'Invalid number.'                                     :(GETCOUNT.LOOP)
GETCOUNT.END

********************************************************************************
* MAINLINE CODE
********************************************************************************
MAIN      OUTPUT =
OUTPUT = 'The mysterious game of Nim!'
OUTPUT = 'Whoever takes the last token of twelve wins.'
tokens = 12

****************************************
* MAIN LOOP
****************************************
MAIN.LOOP OUTPUT =
OUTPUT = 'There are ' tokens ' tokens remaining.  How many do you want to take?'

********************
* Player turn.
********************
MAIN.P    ptake = getcount()
tokens = tokens - ptake
OUTPUT = 'You selected ' ptake ' tokens leaving ' tokens '.'
lt(tokens, 0)                                                :S(ERROR)
gt(tokens, 12)                                               :S(ERROR)
eq(tokens, 0)                                                :S(MAIN.PWIN)

********************
* Computer turn.
********************
MAIN.C    ctake = 4 - ptake
tokens = tokens - ctake
OUTPUT = 'Computer selects ' ctake ' tokens leaving ' tokens '.'
lt(tokens, 0)                                                    :S(ERROR)
gt(tokens, 12)                                                   :S(ERROR)
eq(tokens, 0)                                                    :S(MAIN.CWIN)

:(MAIN.LOOP)

****************************************
* Player win is impossible.  Joke code.
****************************************
MAIN.PWIN OUTPUT = 'Player wins.  This is impossible.  You must have cheated.'
OUTPUT = 'Formatting hard drive...'                                  :(ERROR)

****************************************
* Computer win is inevitable.
****************************************
MAIN.CWIN OUTPUT = 'Computer wins.'      :(EXIT)

********************************************************************************
* On a routine exit we turn off the variable dump.
* If we exit through an error (like branching to a non-existent label 'ERROR')
* then this code doesn't happen and variables get dumped and the line of the
* failed check getting printed.
********************************************************************************
EXIT      OUTPUT = 'Bye!'
&DUMP = 0

END```
```The mysterious game of Nim!
Whoever takes the last token of twelve wins.

There are 12 tokens remaining.  How many do you want to take?
Enter a number between 1 and 3, blank line to exit.
> 4
Invalid number.
> 0
Invalid number.
> test
Invalid number.
> 3
You selected 3 tokens leaving 9.
Computer selects 1 tokens leaving 8.

There are 8 tokens remaining.  How many do you want to take?
Enter a number between 1 and 3, blank line to exit.
> 2
You selected 2 tokens leaving 6.
Computer selects 2 tokens leaving 4.

There are 4 tokens remaining.  How many do you want to take?
Enter a number between 1 and 3, blank line to exit.
> 1
You selected 1 tokens leaving 3.
Computer selects 3 tokens leaving 0.
Computer wins.
Bye!```

## Swift

```var tokens = 12

while tokens != 0 {
print("Tokens remaining: \(tokens)\nPlease enter a number between 1 and 3: ", terminator: "")

guard let input = readLine(), let n = Int(input), n >= 1 && n <= 3 else {
fatalError("Invalid input")
}

tokens -= n

if tokens == 0 {
print("You win!")

break
}

print("I'll remove \(4 - n) tokens.")

tokens -= 4 - n

if tokens == 0 {
print("I win!")
}

print()
}
```
Output:
```Tokens remaining: 12
Please enter a number between 1 and 3: 3
I'll remove 1 tokens.

Tokens remaining: 8
Please enter a number between 1 and 3: 2
I'll remove 2 tokens.

Tokens remaining: 4
Please enter a number between 1 and 3: 3
I'll remove 1 tokens.
I win!```

## V (Vlang)

Translation of: Go
```import os { input }

fn show_tokens(tokens int) {
println('Tokens remaining \$tokens\n')
}

fn main() {
mut tokens := 12
for {
show_tokens(tokens)
t := input('  How many tokens 1, 2, or 3? ').int()
if t !in [1, 2, 3] {
println('\nMust be a number between 1 and 3, try again.\n')
} else {
ct := 4 - t
mut s := 's'
if ct == 1 {
s = ''
}
println('  Computer takes \$ct token\$s \n')
tokens -= 4
}
if tokens == 0 {
show_tokens(0)
println('  Computer wins!')
return
}
}
}```
Output:

Sample game:

```Tokens remaining 12

How many tokens 1, 2 or 3? 2
Computer takes 2 tokens

Tokens remaining 8

How many tokens 1, 2 or 3? 4

Must be an integer between 1 and 3, try again.

Tokens remaining 8

How many tokens 1, 2 or 3? 1
Computer takes 3 tokens

Tokens remaining 4

How many tokens 1, 2 or 3? 3
Computer takes 1 token

Tokens remaining 0

Computer wins!
```

```T:LET'S PLAY NIM WITH 7 PEBBLES.
T:WE TAKE TURNS TAKING 1,2 OR 3.
T:THE LAST ONE TO TAKE ONE LOSES.
T:THERE ARE 7, HOW MANY ?
A:
M:1
YJ:1
M:2
YJ:2
M:3
YJ:6
T:YOU CAN TAKE ONLY 1,2, OR 3.
J:0
*T:THAT LEAVES 6, I TAKE 1 LEAVING 5.
T:HOW MANY ?
A:
M:1
YJ:5
M:2
YJ:4
M:3
YJ:3
T:YOU MUST TAKE 1,2 OR 3.
J:0
*T:THAT LEAVES 5, I TAKE 1 LEAVING 4.
T:HOW MANY ?
A:
M:1
YJ:3
M:2
YJ:2
M:3
YJ:1
T:YOU MUST TAKE 1,2 OR 3 ONLY.
J:0
*T:THAT LEAVES THE LAST ONE.
T:I TAKE IT ... YOU WIN!
J:5
*T:THAT LEAVES 2, I TAKE 1 LEAVING 1.
J:3
*T:THAT LEAVES 3, I TAKE 2 LEAVING 1.
J:2
*T:THAT LEAVES 4, I TAKE 3 LEAVING 1.
*T:HOW MANY ?
A:
M:1
NT:YOU HAVE NO CHOICE BUT TO TAKE 1.
NT:HOW MANY ?
NJ:0
T:YOU JUST TOOK THE LAST ONE ... I WIN.
*T:TO PLAY AGAIN TYPE THE DOLLAR SIGN.
S:```

## Wren

Translation of: Go
```import "io" for Stdin, Stdout

var showTokens = Fn.new { |tokens| System.print("Tokens remaining %(tokens)\n") }

var tokens = 12
while (true) {
showTokens.call(tokens)
System.write("  How many tokens 1, 2 or 3? ")
Stdout.flush()
if (t.type != Num || !t.isInteger || t < 1 || t > 3) {
System.print("\nMust be an integer between 1 and 3, try again.\n")
} else {
var ct = 4 - t
var s = (ct != 1) ? "s" : ""
System.write("  Computer takes %(ct) token%(s)\n\n")
tokens = tokens - 4
}
if (tokens == 0) {
showTokens.call(0)
System.print("  Computer wins!")
break
}
}
```
Output:

Sample game:

```Tokens remaining 12

How many tokens 1, 2 or 3? 2
Computer takes 2 tokens

Tokens remaining 8

How many tokens 1, 2 or 3? 4

Must be an integer between 1 and 3, try again.

Tokens remaining 8

How many tokens 1, 2 or 3? 1
Computer takes 3 tokens

Tokens remaining 4

How many tokens 1, 2 or 3? 3
Computer takes 1 token

Tokens remaining 0

Computer wins!
```

## XPL0

Translation of: Go
```func    ShowTokens(Tokens);
int     Tokens;
[Text(0, "Tokens remaining: ");
IntOut(0, Tokens);
CrLf(0);  CrLf(0);
];

int     Tokens, T, CT;
[Tokens:= 12;
loop    [ShowTokens(Tokens);
Text(0, "  How many Tokens (1, 2 or 3)? ");
T:= IntIn(0);
if T < 1 or T > 3 then
Text(0, "^m^jMust be a number between 1 and 3. Try again.^m^j^m^j")
else    [CT:= 4 - T;
Text(0, "  Computer takes ");
IntOut(0, CT);
Text(0, " token");
if CT # 1 then ChOut(0, ^s);
Text(0, ".^m^j^m^j");
Tokens:= Tokens - 4;
];
if Tokens = 0 then
[ShowTokens(0);
Text(0, "  Computer wins!^m^j");
return;
];
];
]```
Output:
```Tokens remaining: 12

How many Tokens (1, 2 or 3)? 2
Computer takes 2 tokens.

Tokens remaining: 8

How many Tokens (1, 2 or 3)? 4

Must be a number between 1 and 3. Try again.

Tokens remaining: 8

How many Tokens (1, 2 or 3)? 1
Computer takes 3 tokens.

Tokens remaining: 4

How many Tokens (1, 2 or 3)? 3
Computer takes 1 token.

Tokens remaining: 0

Computer wins!
```

## Z80 Assembly

Works with: CP/M 3.1 version YAZE-AG-2.51.2 Z80 emulator
Works with: ZSM4 macro assembler version YAZE-AG-2.51.2 Z80 emulator

Use the /S8 switch on the ZSM4 assembler for 8 significant characters for labels and names

This assembles to 99 bytes of instructions plus 98 bytes of static data for the texts and buffer, accounting for a total of 197 bytes. Not sure whether the 8080 and 8086 versions counted only instruction size or total program size, but the Z80 provides some powerful looping instructions that help to reduce program size.

Please note that I did not bother with conversion from input characters to integers and using comparisons to validate them, nor did I use arithmetic to calculate the computer's move. Instead, I used fixed strings and the cpdr instruction to look up the user's input as well as the computer's response. The CP/M BDOS call ensures that the user can enter a single character only.

```	;
; Nim game using Z80 assembly language
;
; Runs under CP/M 3.1 on YAZE-AG-2.51.2 Z80 emulator
; Assembled with zsm4 on same emulator/OS, uses macro capabilities of said assembler
; Created with vim under Windows
;
; 2023-04-28 Xorph
;

;
; Useful definitions
;

bdos	equ 05h		; Call to CP/M BDOS function
wrtstr	equ 09h		; Write string to console

cr	equ 0dh		; ASCII control characters
lf	equ 0ah

buflen	equ 01h		; Length of input buffer
maxtok	equ 12		; Starting number of tokens

;
; Macro for BDOS calls
;

push	bc
ld	de,buf
call	bdos
pop	bc
endm

;
; =====================
; Start of main program
; =====================
;

cseg

ld	de,nim		; Print title and initialize
call	print
ld	c,maxtok	; Register c keeps track of remaining tokens

loop:
ld	de,tokens	; Print the remaining tokens
call	print
ld	b,c		; Use b for loop to print remaining tokens
printtk:
ld	de,token
call	print
djnz	printtk

ld	de,prompt	; Prompt user for input
call	print

ld	a,(bufcont)	; Now check input for validity and compute response
ld	hl,validinp+2	; Start from end of valid string, so bc gets set to numeric equivalent
push	bc		; Save token counter, use bc for cpdr
ld	bc,3
cpdr			; Use automatic search function

ld	hl,mymoves	; Get character for response into a
add	hl,bc		; bc contains index into check string as well as response string
pop	bc
ld	a,(hl)
ld	(outbuf),a	; Put it in output buffer

ld	de,response	; Print the computer's move
call	print

ld	a,c		; Subtract 4 tokens from counter
sub	4
ld	c,a

jr	nz,loop		; If not finished, repeat
ld	de,lose		; Otherwise, player lost
call	print

printerr:			; Print error message and try again
pop	bc
ld	de,wronginp
call	print
jp	loop

print:				; Use subroutine instead of macro for smaller code
push	bc
ld	c,wrtstr
call	bdos
pop	bc
ret

;
; ===================
; End of main program
; ===================
;

;
; ================
; Data definitions
; ================
;

dseg

inputbuf:			; Input buffer
defb	buflen		; Maximum possible length
defb	00h		; Returned length of actual input
bufcont:
defs	buflen		; Actual input area
nim:
defb	'Nim\$'		; Dialog texts
prompt:
defb	cr,lf,'How many will you take (1-3)? \$'
response:
defb	cr,lf,'I take '	; No \$ here! Saves one print command
outbuf:
defb	' \$'		; For printing response
tokens:
defb	cr,lf,cr,lf,'Tokens: \$'
token:
defb	'|\$'
lose:
defb	cr,lf,'You lose!\$'
wronginp:
defb    cr,lf,'Wrong input\$'
validinp:
defb	'123'		; Valid input
mymoves:
defb	'321'		; Computer's response```
Output:
```E>nim
Nim

Tokens: ||||||||||||
How many will you take (1-3)? 2
I take 2

Tokens: ||||||||
How many will you take (1-3)? 4
Wrong input

Tokens: ||||||||
How many will you take (1-3)? 3
I take 1

Tokens: ||||
How many will you take (1-3)? 1
I take 3
You lose!
E>
```