leap_year.c

#include <stdio.h>

#define TRUE 1
#define FALSE 0

int judge(int year)
{
	if(year % 4 != 0)
		return FALSE;
	else if(year % 100 == 0)
	{
		if(year % 400 == 0)
			return TRUE;
		else
			return FALSE;
	}
	else 
		return TRUE;
}

int main(void)
{
	int year = 0;
	char *s[2] = {"NO", "YES"};

	scanf("%d", &year);

	printf("%s\n", s[judge(year)]);

	return 0;
}