程序代码：

#include"stdio.h"
main()
{
    int a,year;
    for(year=2000;year<=2500;year++)
    {
        a=(year%4==0&&year%100!=0)||year%400==0;
        if(a!=0)
            printf("%d年是闰年！\n",year);
        else
            printf("%d年不是闰年！\n",year);
        
    } 
}