#include<stdio.h>
void main()
{
    int year;
    printf("输入任一个年份:");
    scand("%d",&year);
    if((year%4==0&&year%100! =0)||(year%400==0))
        printf("%d年是公历闰年!\n",year);
    else printf("%d年不是公历闰年!\n",year);
}
还有!和=在这里面起什么作用啊?