c语言 计算闰年

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

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
	int year,panduan;
	printf("请输出需要判断的年份：");
	scanf("%d",&year);
	if(year%4==0)
	{
		if(year%100!=0)
		{
			panduan=1;
		}
		else if(year%400)
		{
			panduan=1;
		}
		else
		{
			panduan=0;
		}
	 } 
	 else
	 {
	 	panduan=0;
	 }
	 if(panduan=1)
	 {
	 	printf("%d年是闰年。",year);
	 }
	 else
	 {
	 	printf("%d年是平年",year);
	  } 
	return 0;
}