Tic_Tac_Toe.c

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


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

int checkwin();
void board();
int main()
{
    int player = 1, i, choice;
    char mark;
    do
    {
        board();
        player = (player % 2) ? 1 : 2;
      if (player%2==0)
      {
        printf("Player %d, enter a number:  ", player);
        scanf("%d", &choice);
      }
      else{
        srand(time(0));
        choice=rand()%8+1;
      }
    
    
            system("clear");

         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 move ");

            player--;
        }
        i = checkwin();

        player++;
    }while (i ==  - 1);
    
    board();
    
    if (i == 1)
    {
        if (player==1)
        {
            printf("You won !");
        }
        else printf("Computer win ! ");
    }
        
    else
        printf("\t Game draw \n");


    return 0;
}

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[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] != '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 board()
{
    printf("\n\t Tic Tac Toe 😀 \n\n");
    printf("---------------------------\n\n");

   for(int i=1;i<=7;i+=3)
    {
        printf("   %c\t|   %c\t|   %c\t \n",square[i],square[i+1],square[i+2]);
        printf("\t|\t|\t\n");
        if (i==7)
        {
         printf("\n");
         break ;
        }
        printf("-------------------------\n");
    }
 



}