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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <time.h>
  4.  
  5. char a[9];
  6.  
  7. // Print the Tic Tac Toe field
  8. void print_the_field() {
  9.     for (int i = 0; i < 9; i++) {
  10.         if (a[i] == ' ') printf("%d", i + 1);
  11.         else printf("%c", a[i]);
  12.  
  13.         if (i % 3 == 2) {
  14.             if (i != 8) printf("\n-+-+-\n");
  15.             else printf("\n");
  16.         } else {
  17.             printf("|");
  18.         }
  19.     }
  20.     printf("\n");
  21. }
  22.  
  23. // Check for win, loss, draw, or ongoing
  24. int check() {
  25.     int wins[8][3] = {
  26.         {0, 1, 2},
  27.         {3, 4, 5},
  28.         {6, 7, 8},
  29.         {0, 3, 6},
  30.         {1, 4, 7},
  31.         {2, 5, 8},
  32.         {0, 4, 8},
  33.         {2, 4, 6}
  34.     };
  35.  
  36.     for (int i = 0; i < 8; i++) {
  37.         if (a[wins[i][0]] != ' ' &&
  38.             a[wins[i][0]] == a[wins[i][1]] &&
  39.             a[wins[i][1]] == a[wins[i][2]]) {
  40.             if(a[wins[i][0]] == 'X') return 1;
  41.             else return 2;    
  42.         }
  43.     }
  44.  
  45.     for (int i = 0; i < 9; i++) {
  46.         if (a[i] == ' ') return 0;
  47.     }
  48.  
  49.     return 3; // Draw
  50. }
  51.  
  52. int main() {
  53.     srand(time(0));
  54.  
  55.     for (int i = 0; i < 9; i++) a[i] = ' ';
  56.  
  57.     int turn = 0;
  58.  
  59.     while (1) {
  60.  
  61.         if (turn == 0) {
  62.             printf("Enter the number of the cell: ");
  63.             int x;
  64.             scanf("%d", &x);
  65.             x--;
  66.  
  67.             if (x < 0 || x >= 9 || a[x] != ' ') {
  68.                 printf("Invalid cell number. Try again.\n");
  69.                 system("pause");
  70.                 continue;
  71.             }
  72.  
  73.             a[x] = 'X';
  74.  
  75.             int res = check();
  76.             if (res != 0) {
  77.                 print_the_field();
  78.                 if (res == 1) printf("You Win!\n");
  79.                 else if (res == 2) printf("Computer Wins!\n");
  80.                 else printf("It's a Draw!\n");
  81.                 break;
  82.             }
  83.  
  84.             turn = 1;
  85.         } else {
  86.             int x;
  87.             while (1) {
  88.                 x = rand() % 9;
  89.                 if (a[x] == ' ') {
  90.                     a[x] = 'O';
  91.                     break;
  92.                 }
  93.             }
  94.  
  95.             printf("Computer chose cell %d\n", x + 1);
  96.  
  97.             int res = check();
  98.             if (res != 0) {
  99.                 print_the_field();
  100.                 if (res == 1) printf("You Win!\n");
  101.                 else if (res == 2) printf("Computer Wins!\n");
  102.                 else printf("It's a Draw!\n");
  103.                 break;
  104.             }
  105.  
  106.             turn = 0;
  107.         }
  108.         system("cls"); 
  109.     }
  110.  
  111.     return 0;
  112. }
  113.  
Success #stdin #stdout #stderr 0.01s 5324KB
comments (?)
stdin
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stdout
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Enter the number of the cell: Computer chose cell 2
Enter the number of the cell: Invalid cell number. Try again.
Enter the number of the cell: Computer chose cell 4
Enter the number of the cell: Invalid cell number. Try again.
Enter the number of the cell: Computer chose cell 7
Enter the number of the cell: Computer chose cell 9
Enter the number of the cell: Invalid cell number. Try again.
Enter the number of the cell: X|O|X
-+-+-
O|X|X
-+-+-
O|X|O

It's a Draw!
stderr
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sh: 1: cls: not found
sh: 1: cls: not found
sh: 1: pause: not found
sh: 1: cls: not found
sh: 1: cls: not found
sh: 1: pause: not found
sh: 1: cls: not found
sh: 1: cls: not found
sh: 1: cls: not found
sh: 1: cls: not found
sh: 1: pause: not found
https://ideone.com/MblTGa
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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