#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define ROW 3
#define COL 3

void init_board(char arr[ROW][COL])
{
 int i=0;
 int j=0;
 for (i = 0; i < ROW; i++)
 {
  for (j = 0; j < COL; j++)
  {
   arr[i][j] = ' ';
  }
 }
}
void display_board(char arr[ROW][COL])
{
 int i = 0;
 for (i = 0; i < ROW; i++)
 {
  printf(" %c|%c |%c\n", arr[i][0], arr[i][1], arr[i][2]);
  if (i < 2)
  {
   printf("--|--|--");
  }
  printf("\n");
 }

}
void player_chess(char arr[ROW][COL])
{
 int x = 0;
 int y = 0;
 while (1)
 {
  printf("請輸入你所要下棋的方位：");
  scanf("%d%d", &x, &y);
  x--;
  y--;
  if (arr[x][y] == ' ')
  {
   arr[x][y] = '#';
   break;
  }
  else
  {
   printf("這個位置已經被占，請重新下棋。\n");
   continue;
  }
 }
}
void computer_chess(char arr[ROW][COL])
{
 srand((unsigned)time(NULL));
 while (1)
 {
  int x = 0;
  int y = 0;
  srand((unsigned)time(NULL));
  x = rand() % 3;
  y = rand() % 3;
  if (arr[x][y] == ' ')
  {
   arr[x][y] = '@';
   break;
  }
  else
  {
   if (check_full(arr) == 0)
   {
    continue;
   }
   else
   {
    break;
   }
  }
 }
}


int check_full(char arr[ROW][COL])
{
 int i = 0;
 int j = 0;
 for (i = 0; i < ROW; i++)
 {
  for (j = 0; j < COL; j++)
  {
   if (arr[i][j] == ' ')
   {
    return 0;
   }
  }
 }
 return 1;
}
char check_win(char arr[ROW][COL])
{
 int i = 0;
 int ret = 0;

 for (i = 0; i < ROW; i++)
 {
  if ((arr[i][0] == arr[i][1]) && (arr[i][2] == arr[i][1]))
  {
   return arr[i][0];
  }
 }
 for (i = 0; i < COL; i++)
 {
  if ((arr[0][i] == arr[1][i]) && (arr[2][i] == arr[1][i]))
  {
   return arr[0][i];
  }
 }
 if ((arr[0][0] == arr[1][1]) && (arr[1][1] == arr[2][2]))
 {
  return arr[0][0];
 }
 if ((arr[0][2] == arr[1][1]) && (arr[1][1] == arr[2][0]))
 {
  return arr[2][0];
 }
 ret = check_full(arr);
 if (ret == 1)
 {
  return 'q';
 }
 return ' ';
}
int main()
{
 char arr[ROW][COL] = { 0 };
 int input = 1;
 while (input)
 {

  printf("請選擇是否開始游戲：");
  printf("1:繼續游戲，0：結束游戲");
  scanf("%d", &input);
  switch (input)
  {
  case 1:{
   char ret = 0;
   init_board(arr);
   do
   {

    display_board(arr);
    player_chess(arr);
    display_board(arr);
    if (check_win(arr) != ' ')
    {
     ret = check_win(arr);
     break;
    }
    computer_chess(arr);
    ret = check_win(arr);
   } while (ret == ' ');
   display_board(arr);
   if (ret == '#')
   {
    printf("玩家贏的游戲\n");
   }
   else if (ret == '@')
   {
    printf("電腦贏的游戲\n");
   }
   else if (ret == 'q')
   {
    printf("游戲平局\n");
   }
  }

   break;
  case 0:
   break;
  }

 }
 system("pause");
 return 0;
}