C语言三子棋解析

void menu()//打印菜单
{
  printf("******************\n");
  printf("******1.play******\n");
  printf("******0.exit******\n");
  printf("******************\n");
}

//存放下棋数据
char board[ROW][COL] = { 0 };
//初始化棋盘为全空格
InitBoard(board, ROW, COL);
//初始化棋盘为空格
void InitBoard(char board[ROW][COL], int row, int col)
{
  int i = 0;
  for (i = 0; i < row; i++)
  {
    int j = 0;
    for (j = 0; j < col; j++)
    {
      board[i][j] = ' ';
    }
  }
}
//打印棋盘
void DisplayBoard(char board[ROW][COL], int row, int col)//打印棋盘
{
  //打印数据
  int i = 0;
  for (i = 0; i < row; i++)
  {
    int j = 0;
    for (j = 0; j < col; j++)
    {
      printf(" %c ",board[i][j]);//别忘记board[i][j]
      if (j < col - 1)
      {
        printf("|");
      }
    }
    printf("\n");
    //打印分割行
    if (i < row-1)//记住   row-1
    {
      for (j = 0; j < col; j++)
      {
        printf("---");
        if (j < col - 1)
        {
          printf("|");
        }
      }
      printf("\n");
    }
  }
}

//玩家下棋
void player_move(char board[ROW][COL], int row, int col)
{
  int x = 0;
  int y = 0;
  printf("玩家下棋\n");
  while (1)
  {
    printf("请输入坐标：");
    scanf("%d %d", &x, &y);
    if (x >= 1 && x <= row && y >= 1 && y <= col)
    {
      if (board[x - 1][y - 1] == ' ')
      {
        board[x - 1][y - 1] = '*';
        break;
      }
      else
      {
        printf("该坐标被占用，请重新输入\n");
      }
    }
    else
    {
      printf("非法坐标，请重新输入\n");
    }
  }

void computer_move(char board[ROW][COL], int row, int col)
{
  int x = 0;
  int y = 0;
  printf("电脑下棋：>\n");
  while (1)
  {
    x = rand() % 3;//范围（a，b）用rand表示就是rand（）%（b-a+1）
    y = rand() % 3;
    if (board[x][y] == ' ')//判断是否为空格，因为只有这一个条件，所以满足这个条件就可以下
    {
      board[x][y] = '#';
      break;
    }
  }
}

while (1)//玩家和电脑轮流下棋，直到一方胜利
  {   //玩家下棋
    player_move(board, ROW, COL);
    //打印棋盘
    DisplayBoard(board, ROW, COL);
    ret = is_win(board, ROW, COL);
    if (ret != 'C')
    {
      break;
    }
    //电脑下棋
    computer_move(board, ROW, COL);
    //打印棋盘
    DisplayBoard(board, ROW, COL);
    ret = is_win(board, ROW, COL);
    if (ret != 'C')
    {
      break;
    }
  }
  if (ret == '*')
  {
    printf("玩家获胜\n");
  }
  else if (ret == '#')
  {
    printf("电脑获胜\n");
  }
  else // (ret == 'Q')
  {
    printf("平局\n");
  }
  DisplayBoard(board, ROW, COL);
}
 //判断输赢
char is_win(char board[ROW][COL], int row, int col)
{
  //判断每一行是否都相等
  int i = 0;
  for (i = 0; i < col; i++)
  {
    if (board[i][0] == board[i][1] && board[i][1] == board[i][2] && board[i][1] != ' ')
    {
      return  board[i][1];
    }
  }
  //判断每一列是否都相等
  for (i = 0; i < col; i++)
  {
    if (board[0][i] == board[1][i] && board[1][i] == board[2][i] && board[1][i] != ' ')
    {
      return board[i][1];
    }
  }
  //判断对角线是否都相等
  if (board[0][0] == board[1][1] && board[1][1] == board[2][2] && board[1][1] != ' ')
  {
    return board[1][1];
  }
  if (board[0][2] == board[1][1] && board[1][1] == board[2][0] && board[1][1] != ' ')
  {
    return board[1][1];
  }
  //判断平局
  if (is_full(board, row, col) == 1)
  {
    return 'Q';
  }
  //继续
  return 'C';
}