找闰年（函数）

#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>

int is_leap_year(int y)

{

if ((y % 4 == 0 && y % 100 != 0) || y % 400 == 0)

 return 1;

else

 return 0;

}

int main()

{

int year = 0;

for (year = 1000; year < 3000; year++)

{

 if (is_leap_year(year) == 1)

  printf("%d ", year);

}

}