void main()
{
int year;
printf(“請輸入年份：”);
scanf(“%d”,&year);
if(year%4==0&&year%100!=0||year%400==0)
printf(“%d年是閏年！\n",year);
else
printf(“%d年是平年！\n",year);
}
判斷閏年的方法：四年壹閏，百年不閏，四百年再閏。