ticTacToe.c

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

void playTicTacToe()
{
    system("color 0b");
    char square[10] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};

    int player = 1, i, choice;
    char mark; // X or O
    do
    {
        drawBoard(square);
        player = (player % 2) ? 1 : 2;
        printf("Player %d , enter the choice : \n", player);
        scanf("%d", &choice);

        mark = (player == 1) ? 'X' : 'O';
        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 input!");
            player--;
            getch();
        }
        i = checkWin(square);
        player++;
    } while (i == -1);

    if (i == 1)
    {
        printf("==> Player %d won ", --player);
    }
    else
    {
        printf("==> Game Draw!");
    }

    getch();
}

int checkWin(char square[10])
{
    if (square[1] == square[2] && square[2] == square[3])
        return 1;
    else if (square[4] == square[5] && square[5] == square[6])
        return 1;
    else if (square[7] == square[8] && square[8] == square[9])
        return 1;
    else if (square[1] == square[5] && square[5] == square[9])
        return 1;
    else if (square[3] == square[5] && square[5] == square[7])
        return 1;
    else if (square[1] == square[4] && square[4] == square[7])
        return 1;
    else if (square[2] == square[5] && square[5] == square[8])
        return 1;
    else if (square[3] == square[6] && square[6] == square[9])
        return 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')
        return 0;

    else
        return -1;
}

void drawBoard(char square[10])
{

    system("cls");
    printf("\n \n\t\t\t\t\t TIC TAC TOE\n\n");
    printf("\t\t\t\t\tplayer1 (X) - player2 (O)\n\n\n");
    printf("\t\t\t\t\t    |    |    \n");
    printf("\t\t\t\t\t%c   |  %c |  %c\n", square[1], square[2], square[3]);
    printf("\t\t\t\t\t____|____|____\n");
    printf("\t\t\t\t\t    |    |    \n");
    printf("\t\t\t\t\t%c   |  %c |  %c\n", square[4], square[5], square[6]);
    printf("\t\t\t\t\t    |    |    \n");
    printf("\t\t\t\t\t____|____|____\n");
    printf("\t\t\t\t\t    |    |    \n");
    printf("\t\t\t\t\t%c   | %c  |  %c\n", square[7], square[8], square[9]);
    printf("\t\t\t\t\t    |    |    \n");
}