Tic Tac Toe Win Checking Function

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Anas Abou Allaban 2015-10-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/246433-tic-tac-toe-win-checking-function

评论： Anas Abou Allaban 2015-10-3

I'm writing a tic tac toe game and part of the 'coding rules' is that there should be a 'checkwin' function to see whether a player has won or not. I have defined two variables called 'tttXArray' and 'tttOArray' to see whether one player has gotten three in a row for horizontal, vertical, or diagonal inputs. This is the function with the tttXArray placed as an example:

function [won] = checkwin
%Check to see whether the game has been won or not
% Horizontal
    if (tttXArray(1,1) == tttXArray(1,2) && tttXArray(1,1) == tttXArray(1,3))
        won = 1;
    elseif (tttXArray(2,1) == tttXArray(2,2) && tttXArray(2,1) == tttXArray(2,3))
        won = 1;
    elseif (tttXArray(3,1) == tttXArray(3,2) && tttXArray(3,1) == tttXArray(3,3))
        won = 1;
    % Vertical
    elseif (tttXArray(1,1) == tttXArray(2,1) && tttXArray(1,1) == tttXArray(3,1)) 
        won = 1;
    elseif (tttXArray(1,2) == tttXArray(2,2) && tttXArray(1,2) == tttXArray(3,2)) 
        won = 1;
    elseif (tttXArray(1,3) == tttXArray(2,3) && tttXArray(1,3) == tttXArray(3,3)) 
        won = 1;
    % Diagonal
    elseif (tttXArray(1,1) == tttXArray(2,2) && tttXArray(1,1) == tttXArray(3,3))
        won = 1;
    elseif (tttXArray(1,3) == tttXArray(2,2) && tttXArray(1,3) == tttXArray(3,1))
        won = 1;
    end
end

The error I get is:

Undefined function 'tttXArray' for input arguments of type 'double'.

What seems to be the problem?

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Answer 1

John D'Errico 2015-10-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/246433-tic-tac-toe-win-checking-function#answer_194477

Your function has no arguments. How do you expect it to know what those variables are?

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Thorsten 2015-10-2

在 MATLAB Online 中打开

No. You should define

function won = checkwin(tttXArray)

and call using

checkwin(tttXArray)

Anas Abou Allaban 2015-10-3

So I realized my rather beginner mistake, I was not calling the function properly nor was I giving it any proper arguments. The checkwin function works good now, time to debug the rest of the code. Thanks Thorsten for the simplified checking algorithm!

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