tic_tac.c

#include<stdio.h>
#include<conio.h>
#include<windows.h>
#include<stdlib.h>
#include<mmsystem.h>
char square[10] ={'0','1','2','3','4','5','6','7','8','9'};
int checkWin();
void drawboard();
int main()
{
    system("color 4a");
    int player=1,i,choice;
    char mark; // X & O
    do
    {
        drawboard(); 
        player=(player % 2)? 1 : 2 ;      
        printf("Player %d, Enter the choice : ",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 option");
        player--;
        getch();
        }
        i=checkWin();
        player++;
    } 
    while (i == -1);
    drawboard();
    if (i==1)
    {

        printf("\n\n The Player %d has won this Game ",--player);

    }  
    else
    {
        printf("\n\n This Game is Drawn");
    }  
    getch();
    return 0;
        /* code */
}
    
int checkWin()
{
    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[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[9]== square[5] && square[5] == square[9])
    return 1;
    else if (square[3]== square[5] && square[5] == square[7])
    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()
{
    system("cls");
    printf("\n\n\t TIC 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");
}