编程之美 - 中国象棋

#include <stdio.h>

int main()
{
    struct {
        unsigned char a:4;
        unsigned char b:4;
    } i;
    
    for(i.a = 1; i.a <= 9; i.a++)
        for(i.b = 1; i.b <= 9; i.b++)
            if(i.a%3 != i.b%3)
                printf("A = %d, B = %d\n", i.a, i.b);
    
    return 0;
    
}