C++上机作业

#include <iostream.h>
void main()
{
int n,y,t;
cout<<"输入年份:";
cin>>n;
cout<<"输入月份:";
cin>>y;
if((n%4==0&&n%100!=0||n%400==0)&&y==2)
t=29;
else
switch(y)
{
case 2:t=28;break;
case 1:t=31;break;
case 3:t=31;break;
case 5:t=31;break;
case 7:t=31;break;
case 8:t=31;break;
case 10:t=31;break;
case 12:t=31;break;
case 4:t=30;break;
case 6:t=30;break;
case 9:t=30;break;
case 11:t=30;break;
}
cout<<"这个月有"<<t<<"天";
}  <img src="http://img.blog.csdn.net/20160412193330240?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />