程序：
#include <iostream.h>
void main()
{
int year;
cout<<"please input the year"<<endl;
cin>>year;
if(year%100==0)
{if(year%400==0)
cout<<"It is a leap year!"<<endl;
else
cout<<"It is not a leap year!"<<endl;
}
else
{if(year%4==0)
cout<<"It is a leap year!"<<endl;
else
cout<<"It is not a leap year"<<endl;
}
}



好像這是個入門級作品哦，一開始把判斷條件搞錯，還一直在懷疑1900年為什么是閏年，呵呵。