闰年：

                1、能被4整除不能被100整除

                2、能被400整除

#define _CRT_SECURE_NO_WARNINGS 1#include<stdio.h>
int main()
{int year;for(year = 1000; year <= 2000; year++){if((year%4 == 0) && (year%100!=0) || (year%400 == 0)){printf("%d ",year);}}return 0;
}