#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", x%y );
return 0;
}x%y即x模y、x%%y即打印一个%
显示一个百分号，让那个输出的样子是x%y.