#include
int main(void)
{
    int player = 0;
    int winner = 0;
    int row = 0;
    int column =0;
    int line = 0;
    int choice = 0;
    int i = 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 ",board[2][0],board[2][1],board[2][2]);
       player = i%2 +1;
      
       do
       {
         printf("\n\nPlayer %d enter the number of the square where you want to place %c:  ",player,(player==1)?'x':'o');
         scanf("%d",&choice);
         row = --choice/3;
         column = choice%3;
       }
       while(choice<1 || choice>9 || board[row][column]>'9');  /*这里不明白*/
       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;
       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 ",board[2][0],board[2][1],board[2][2]);
    }
    if(winner==0)
     printf("\n你们都没赢，平局，握手言和");
     if(winner==player)
      printf("\n恭喜!! %d号选手赢了.",winner);
    getchar();
    getchar();
    return 0;
}

问题在这里：
while(choice<1 || choice>9 || board[row][column]>'9');
如果我输入1，while 返回值应该是false,应该继续while下面的语句，而实际的结果是还要继续do的循环，为什么？

do
       {
         printf("\n\nPlayer %d enter the number of the square where you want to place %c:  ",player,(player==1)?'x':'o');
         scanf("%d",&choice);
         row = --choice/3;
         column = choice%3;
       }
while(choice<1 || choice>9 || board[row][column]>'9');
提示玩家输入一个值，存在choice里，printf()输出后也是输入的值啊，然后执行row,column的运算。
choice<1 || choice>9 || board[row][column]>'9'结果是false,继续do循环，结果是true，结束循环，执行while下边的语句。

choice<1 || choice>9 || board[row][column]>'9'结果是true,继续do循环，结果是false，结束循环，执行while下边的语句。
刚才打错了

我明白了，
while(choice<1 || choice>9 || board[row][column]>'9');
应该改成这样
while(choice<0 || choice>8 || board[row][column]>'9');程序才能正确运行。
谢谢提醒。