EEPW论坛

/* Note:Your choice is C IDE */
#include "stdio.h"
void main()
{
    int year,leap;
    scanf("%d",&year);
    if (year%4==0)
    {
    	if (year%100==0)
    	{
    		if (year%400==0)
    		leap=1;
    		else
    		   leap=0;
    	}
    	else
    	   leap=1;
    }
    else
       leap=0;
    if(leap)
        printf("%d is",year);
     else 
        printf("%d is not",year);
     printf("a leap year.\n");

     printf("ID:2013914119");
}

总结：闰年的判断条件有多个，不要遗漏。