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.

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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