TicTac.c

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>

char square[10] = {'o', '1', '2', '3',
                        '4', '5', '6',
                        '7', '8', '9'};
int choice, player;

int checkForWin();
void displayBoard();
void markBoard(char mark);

int main()
{
    int gameStatus;
    char mark;
    player = 1;

    do
    {
        displayBoard();

        player = (player % 2)? 1 : 2;

        printf("player %d, ENTER A NUMBER: ", player);
        scanf("%d", &choice);

        mark = (player == 1)? 'x' : 'o';

        markBoard(mark);

        gameStatus = checkForWin();

        player++;

    } while(gameStatus == -1);

    if(gameStatus == 1)
        printf("==>\aPlayer %d win ", --player);
    else
        printf("==>\aGame draw\n");
    return 0;
}

/*
* FUNCTION RETURN GAME STATUS
* 1 GAME OVER
* -1 GAME IN PROGRESS
* 0 GAME OVER WITH NO RESULT
*/

int checkForWin()
{
    int returnValue = 0;
    // HORIZANTAL MATCH
    if (square[1] == square[2] && square[2] == square[3])
    {
        returnValue = 1;
    }
    else if (square[4] == square[5] && square[5] == square[6])
    {
        returnValue = 1;
    }
    else if (square[7] == square[8] && square[8] == square[9])
    {
        returnValue = 1;
    }
    // VERTICAL MATCH
    else if (square[1] == square[4] && square[4] == square[7])
    {
        returnValue = 1;
    }
    else if (square[2] == square[5] && square[5] == square[8])
    {
        returnValue = 1;
    }
    else if (square[3] == square[6] && square[6] == square[9])
    {
        returnValue = 1;
    }
    // ANGLE MATCH
    else if (square[3] == square[5] && square[5] == square[7])
    {
        returnValue = 1;
    }
    else if (square[1] == square[5] && square[5] == square[9])
    {
        returnValue = 1;
    }
    else if (square[1] != '1' && square[2] != '2' && square[3] != '3' &&
             square[4] != '4' && square[5] != '5' && square[6] != '6' &&
             square[7] != '7' && square[8] != '8' && square[9] != '9')
    {
        returnValue = 0;
    }
    else {
        returnValue = -1;
    }

    return returnValue;
}
/*
* FUNCTION TO DRAW TIC TAC
*/
void displayBoard()
{
    system("cls");

    printf("\n\n\tTIC TAC TOE\n\n");
    printf("Player 1 (x) - Player 2 (o)\n\n\n");

    printf("      |      |      \n");
    printf("  %c   |  %c   |  %c   \n", square[1], square[2], square[3]);
    printf("______|______|______\n");
    printf("      |      |     \n");
    printf("  %c   |  %c   |  %c   \n", square[4], square[5], square[6]);
    printf("______|______|______\n");
    printf("      |      |     \n");
    printf("  %c   |  %c   |  %c   \n", square[7], square[8], square[9]);
    printf("      |      |     \n");

}
/*
* MARK THE BOARD
*/

void markBoard(char mark)
{
    if(choice == 1 && square[1] == '1')
        square[1] = mark;
    else if(choice == 2 && square[2] == '2')
        square[2] = mark;
    else if(choice == 3 && square[3] == '3')
        square[3] = mark;
    else if(choice == 4 && square[4] == '4')
        square[4] = mark;
    else if(choice == 5 && square[5] == '5')
        square[5] = mark;
    else if(choice == 6 && square[6] == '6')
        square[6] = mark;
    else if(choice == 7 && square[7] == '7')
        square[7] = mark;
    else if(choice == 8 && square[8] == '8')
        square[8] = mark;
    else if(choice == 9 && square[9] == '9')
        square[9] = mark;
    else
    {
        printf("Invalid move ");
        player--;
        getch();
    }
}