函数判断闰年

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
int Leapyear(int year) {
	int flag=0;
	if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
		flag = 1;
	}
	return flag;
}
int main() {
	int year,flag;
	printf("请输入年份\n");
	scanf("%d", &year);
	flag=Leapyear(year);
	if (flag == 0) {
		printf("不是闰年\n");
	}
	if (flag == 1) {
		printf("是闰年\n");
	}
	system("pause");
	return 0;
}