#include "stdio.h"
main()
{int line=0;
 int player=0,i;
 int winner=0;
 int choice=0;
 int row=0;
 int column=0;
 char board[3][3]={
                   {'1','2','3'},
                   {'4','5','6'},
                   {'7','8','9'}};
   for(i=0;i<9&&winner==0;i++)
   {
    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;
    do
    {
      printf("\nplayer %d,please enter the number of the square"
      "wher you want to place your %c:",player,(player==1)?'x':'o');
      scanf("%d",&choice);
      row=--choice/3;
      column=choice%3;}while(choice<0||choice>9||board[row][column]>'9');
      board[row][column]=(player==1)?'x':'o';
      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
      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;}
      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]);  
       if(winner==0)
       printf("\nhow boring,it is a draw\n");
       else
         printf("\ncongratulatios,player %d,you are the winner!\n",winner);  
    return 0;                  
}

do
    {
      printf("\nplayer %d,please enter the number of the square"  
      "wher you want to place your %c:",player,(player==1)?'x':'o');
      scanf("%d",&choice);
      row=--choice/3;
      column=choice%3;
    }while(choice<0||choice>9||board[row][column]>'9');/*这句应该有问题，输入大于9的数时好像情况不对*/