# Terminating a game of tic tac toe if two entries are entered in the same cell

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As the title suggests, i am finishing up making a game of tic tac toe , and want to write some code at the end that will terminae/end the game if the players try and put more than one X or o in each space. This is what I have currently .

TTCboard = zeros(3,3);

% for creating the standard tic-tac-toe board in green

figure

plot([0 3],[-1 -1], 'g','linewidth',1);% creates top horizontal line in board

hold on

plot([2 2],[0 -3], 'g','linewidth',1)% creates right-most vertical line

plot([0 3],[-2 -2], 'g','linewidth',1)% creates bottom horizontal line

plot([1 1],[0 -3], 'g','linewidth',1)% creates left-most vertical line

axis off % keeps the X & y-axis off, creating a better looking natural board

hold off% ensures later commands are added to existing board

xticks([0 1 2 3]); yticks([0 1 2 3]);

xticklabels([]); yticklabels([]);

player = 'X' % designates the first player as X

while true % when it is player x's turn,

fprintf('%s click to place a piece\n', player); % creates X in the cell clicked on

[x, y] = ginput(1);

x = floor(x)+0.43 ;

y = floor(y)+0.5;

text(x,y,player, 'horizontalalignment', 'center', "FontSize",24);% gives specific parameters to the X on the board

xticks([0 1 2 3]); yticks([0 1 2 3]);

xticklabels([]); yticklabels([]);

player2 = 'O' % Designates the 2nd players turn

while true

fprintf('%s click to place a piece\n', player2);

[x, y] = ginput(1);

x = floor(x)+0.43 ;

y = floor(y)+0.5;

text(x,y,player2, 'horizontalalignment', 'center', "FontSize",24);

break;

end

end

##### 1 Comment

John Chilleri
on 15 Mar 2021

### Accepted Answer

Bob Thompson
on 15 Mar 2021

John has a pretty good idea with that.

If you put in a logic check and a loop, you don't even need to actually quit the game, just tell the player to pick an open spot.

Sample below, but beware that I have not tested it yet. Also, note that P1 has squares marked as 1, and P2 has squares marked as 2. I imagine that will be useful for determining who owns which squares and if somebody wins.

while true % when it is player x's turn,

fprintf('%s click to place a piece\n', player); % creates X in the cell clicked on

[x, y] = ginput(1);

x = floor(x)+0.5 ;

y = floor(y)+0.5;

while TTCboard(x+0.5,-(y-0.5)) ~= 0;

disp('Please pick an open square')

[x, y] = ginput(1);

x = floor(x)+0.5;

y = floor(y)+0.5;

end

text(x,y,player, 'horizontalalignment', 'center', 'FontSize',24);% gives specific parameters to the X on the board

% Close space for later use

TTCboard(x+0.5,-(y-0.5)) = 1;

xticks([0 1 2 3]); yticks([0 1 2 3]);

xticklabels([]); yticklabels([]);

player2 = 'O' % Designates the 2nd players turn

while true

fprintf('%s click to place a piece\n', player2);

[x, y] = ginput(1);

x = floor(x)+0.5;

y = floor(y)+0.5;

while TTCboard(x+0.5,-(y-0.5)) ~= 0;

disp('Please pick an open square')

[x, y] = ginput(1);

x = floor(x)+0.5;

y = floor(y)+0.5;

end

text(x,y,player2, 'horizontalalignment', 'center', 'FontSize',24);

% Close space for later use

TTCboard(x+0.5,-(y-0.5)) = 2;

break;

end

end

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