leap_year_2.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define MAX_LEN 255
#define TRUE 1
#define FALSE 0

int judge(char *str)
{
	int year = 0;
	if(strlen(str) > 9)	// 超出一个32bit能表示的最大位数
	{
		strcpy(str, str + strlen(str) - 4);
		year = (str[0] - '0')*1000 + (str[1] - '0')*100 + (str[2] - '0')*10 + str[3] - '0';
	}
	else
		year = atoi(str);

	return (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0));
}

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

	fscanf(str, MAX_LEN - 1, stdin);

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

	return 0;
}