#include <stdio.h>
int main()
{
??? int x,y;
??? x = 10;
??? y = -3;
??? printf("x+y=%d\n", 7??? );?
??? printf("x-y=%d\n", 13??? );
??? printf("x*y=%d\n", -30??? );
??? printf("x/y=%d\n",? -3?? );
??? printf("x%y=%d\n",? 1?? );?
??? return 0;???
}

為什么倒數(shù)第二行是1不是-1呢？