program5_07.c

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/* Program 5.7 Tic-Tac-Toe */
#include <stdio.h>

int main(void)
{
  int player = 0;                      /* Player number - 1 or 2               */
  int winner = 0;                      /* The winning player                   */
  int choice = 0;                      /* Square selection number for turn     */
  int row = 0;                         /* Row index for a square               */
  int column = 0;                      /* Column index for a square            */
  int line=0;                          /* Row or column index in checking loop */

  char board[3][3] = {                 /* The board */
              {'1','2','3'},           /* Initial values are reference numbers */
              {'4','5','6'},           /* used to select a vacant square for   */
              {'7','8','9'}            /* a turn.                              */
                     };

  /* The main game loop. The game continues for up to 9 turns */
  /* As long as there is no winner                            */
  for(int i = 0; i<9 && winner==0; i++)
  {
    /* Display the board */
    printf("\n\n");
    printf(" %c | %c | %c\n", board[0][0], board[0][1], board[0][2]);
    printf("---+---+---\n");
    printf(" %c | %c | %c\n", board[1][0], board[1][1], board[1][2]);
     printf("---+---+---\n");
    printf(" %c | %c | %c\n", board[2][0], board[2][1], board[2][2]);

    player = i%2 + 1;                 /* Select player */

    /* Get valid player square selection */
    do
    {
      printf("\nPlayer %d, please enter the number of the square "
             "where you want to place your %c: ",
              player,(player==1)?'X':'O');
      scanf("%d", &choice);

      row = --choice/3;                /* Get row index of square    */
      column = choice%3;               /* Get column index of square */
    }while(choice<0 || choice>9 || board[row][column]>'9');

    /* Insert player symbol */
    board[row][column] = (player == 1) ? 'X' : 'O';

    /* Check for a winning line - diagonals first */
    if((board[0][0]==board[1][1] && board[0][0]==board[2][2]) ||
       (board[0][2]==board[1][1] && board[0][2]==board[2][0]))
      winner = player;
    else
      /* Check rows and columns for a winning line */
      for(line = 0; line <= 2; line ++)
        if((board[line][0]==board[line][1] &&
            board[line][0]==board[line][2])||
           (board[0][line]==board[1][line] &&
            board[0][line]==board[2][line]))
          winner = player;
  }
  /* Game is over so display the final board */
  printf("\n\n");
  printf(" %c | %c | %c\n", board[0][0], board[0][1], board[0][2]);
  printf("---+---+---\n");
  printf(" %c | %c | %c\n", board[1][0], board[1][1], board[1][2]);
  printf("---+---+---\n");
  printf(" %c | %c | %c\n", board[2][0], board[2][1], board[2][2]);

  /* Display result message */
  if(winner == 0)
    printf("\nHow boring, it is a draw\n");
  else
    printf("\nCongratulations, player %d, YOU ARE THE WINNER!\n",
                                                           winner);
  return 0;
}