#include <stdio.h>

int main(void)
{
    int player = 0;
    int winner = 0;
    int i = 0;
   
    char board[3][3] = {
        {'1','2','3'},
        {'4','5','6'},
        {'7','8','9'}
        };
        
        for( int 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;
        }
        return 0;

}
编译时会报错，麻烦哪位大哥帮忙指点一点

重复定义，for语句中又定义了一次i

for( int i = 0 ; i < 9 && winner == 0 ; i++)//重复定义I...

哈哈，还是不行呀，改完之后就报这个错
expression syntax in function main
#include <stdio.h>

int main(void)
{
    int player = 0;
    int winner = 0;
   
    char board[3][3] = {
        {'1','2','3'},
        {'4','5','6'},
        {'7','8','9'}
        };
        
        for( int 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;
        }
        return 0;

}

你把错误发过来看看，我来帮助你改

for( int i = 0 ; i < 9 && winner == 0 ; i++)改为for( i = 0 ; i < 9 && winner == 0 ; i++)就行了

大哥啊就没有for(int i;;;)这种写法，你在前面可以定义int i而不赋值，然后在for中赋值i=1。

这个去掉那个重复定义的就没有问题了呀，我用的是Ｃ-Free