Tic Tac Toe Win Checking Function

2015 10 2
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更新时间：2015 10 3
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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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 采纳的回答

John D'Errico
John D'Errico 2015-10-2

1 个投票

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

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Joseph Cheng
Joseph Cheng 2015-10-2
what are the values of tttXArray for each marker? instead of a a long list of if-else statements for the horizontal/vertical wouldn't it be easier to and cleaner to check for the sum of a row and sum of columns? that would leave just 2 if statements for the diagonals which can be simplified as well.
Thorsten
Thorsten 2015-10-2
编辑：Thorsten 2015-10-2
Joseph is right. You can use something like
function won = checkwin(A)
won = any(all(A) | all(A, 2)' | all(diag(A)) | all(fliplr(diag(A))));
Anas Abou Allaban
Anas Abou Allaban 2015-10-2
So the values of tttXArray come from another function where the player chooses their spot.
function [pXInputRow, pXInputCol] = pickXspot(playerInput)
%This function is to take inputs from Player X
global pXInputRow;
global pXInputCol;
%Set text for Roq/Col Prompt
prompt = {'Row (1,2, or 3)', '(Col (1, 2, or 3)'};
name = 'Player X Turn';
%Show prompt to input values
playerInput = inputdlg(prompt, name);
pXInputRow = str2num(playerInput{2});
pXInputCol = str2num(playerInput{1});
end
So I should take tttXArray as an input argument. However, I get
Undefined function or variable 'pXInputRow'.
Thanks for simplified if/else statement suggestion, definitely much cleaner.
Anas Abou Allaban
Anas Abou Allaban 2015-10-2
编辑：Anas Abou Allaban 2015-10-2
Forgot last line:
tttArray(pXInputRow, pXInputCol) = 1;
Thorsten
Thorsten 2015-10-2
No. You should define
function won = checkwin(tttXArray)
and call using
checkwin(tttXArray)
Anas Abou Allaban
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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