checking for win in tic tac toe

This is a discussion on checking for win in tic tac toe within the C++ Programming forums, part of the General Programming Boards category; in my last tic tac toe game, checking for the win was very primative. my board array is set up ...

  1. #1
    Unregistered Leeman_s's Avatar
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    checking for win in tic tac toe

    in my last tic tac toe game, checking for the win was very primative. my board array is set up like this:

    [1,1] [1,2] [1,3]
    [2,1] [2,2] [2,3]
    [3,1] [3,2] [3,3]

    this is how my old checkforwin looked:
    Code:
    void checkforwin()
    	{
    		int w=1;
    		char d='X';
    		win=0;
    		for(int p=1;p<=2;p++)
    		{
    			if(p==2)
    			{
    				d='O';
    				w=2;
    			}
    		for(int g=1;g<4;g++)
    		{
    			if(board[1][g]==d && board[2][g]==d && board[3][g]==d)
    			{
    				win=w;
    			}
    		}
    		for(int t=1;t<4;t++)
    		{
    			if(board[t][1]==d && board[t][2]==d && board[t][3]==d)
    			{
    				win=w;
    			}
    		}
    		if(board[1][1]==d && board[2][2]==d && board[3][3]==d)
    		{
    			win=w;
    		}
    		if(board[3][1]==d && board[2][2]==d && board[1][3]==d)
    		{
    			win=w;
    		}
    		}
    	}
    im thinking of this: perhaps i could search the array for x (or 0), and then see if it is in a line or something. just anything better than what is above. also, sorry for so much posting.

  2. #2
    and the hat of wrongness Salem's Avatar
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    Break it down into its component steps
    Code:
    #define BOARD   3
    
    // checks all rows
    int checkboardrow ( int board[BOARD][BOARD], int player ) {
        int win = 1;
        int row, col;
        for ( row = 0 ; row < BOARD && win ; row++ ) {
            for ( col = 0 ; col < BOARD && win ; col++ ) {
                if ( board[row][col] != player ) win = 0;
            }
        }
        return win;
    }
    
    // checks all rows, cols and diagonals
    int checkboard ( int board[BOARD][BOARD], int player ) {
        return checkboardrow(board,player) ||   // checks all rows
               checkboardcol(board,player) ||   // checks all cols
               checkboardleft(board,player)||   // checks left diagonal
               checkboardright(board,player);   // checks right diagonal
    }

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