#include <stdio.h>

int main()

{

    int x,y;

    x = 10;

    y = -3;

    printf("x+y=%d\n",x+y     );  

    printf("x-y=%d\n",x-y );

    printf("x*y=%d\n",x*y );

    printf("x/y=%d\n",x/y );

    printf("x%y=%d\n",x%y );  

    return 0;    

}

  printf("x%y=%d\n",x%y );  这一句%y ，将%默认为打印函数设置了。通不过