ttt.c

#include <stdio.h>


int main(void)
{
    int i = 0;
    int player = 0;
    int go = 0;
    int row = 0; 
    int column = 0;
    int line = 0;
    int winner = 0;
    char board[3][3] = 
    {
        {'1','2','3'},
        {'4','5','6'},
        {'7','8','9'}
    };
    
    for( i = 0; i<9 && winner==0; i++)
    
    {
        printf("\n\n");
        printf(" %c | %c | %c\n", board[0][0], board[0][1], board[0][2]);
        printf("-----------\n");
        printf(" %c | %c | %c\n", board[1][0], board[1][1], board[1][2]);
        printf("-----------\n");
        printf(" %c | %c | %c\n", board[2][0], board[2][1], board[2][2]);
        
        player = i%2 + 1;
        
        do
        {
            printf("\nPlayer %d, please enter the number of the square "
                   "where you want to place your %c: ", player,(player==1)?'X':'O');
            scanf("%d", &go);
            
            row = --go/3;
            column = go%3;
        }
        while(go<0 || go>9 || board[row][column]>'9');
        
        board[row][column] = (player == 1) ? 'X' : 'O';
        
        if((board[0][0] == board[1][1] && board[0][0] == board[2][2]) ||
           (board[0][2] == board[1][1] && board[0][2] == board[2][0]))
            winner = player;
        else
            
            for(line = 0; line <= 2; line ++)
                
                if((board[line][0] == board[line][1] && board[line][0] == board[line][2])||
                   (board[0][line] == board[1][line] && board[0][line] == board[2][line]))
                    winner = player;
        
    }
    printf("\n\n");
    printf(" %c | %c | %c\n", board[0][0], board[0][1], board[0][2]);
    printf("-----------\n");
    printf(" %c | %c | %c\n", board[1][0], board[1][1], board[1][2]);
    printf("-----------\n");
    printf(" %c | %c | %c\n", board[2][0], board[2][1], board[2][2]);
    
    if(winner == 0)
        printf("\nDraw\n");
    else
        printf("\nplayer %d, YOU WON!\n", winner);
}