题目后面中输出后为什么要填运算符？如果前面的不是运算符那有什么意义呢？
#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;
}