闲写c++

#include <iostream>

using namespace std;

int main()
{
int years,month,days;
cout<<"year:";
cin>>years;
cout<<"month:";
cin>>month;
switch(month)
{
case 1:
days=31;
break;
case 2:
if(years%400==0||years%4==0&&years%100!=0)
{
days=29;
}
else days=28;break;
case 3:
days=31;
break;
case 4:
days=30;
break;
case 5:
days=31;
break;
case 6:
days=30;
break;
case 7:
days=31;
break;
case 8:
days=31;
break;
case 9:
days=30;
break;
case 10:
days=31;
break;
case 11:
days=30;
break;
case 12:
days=31;
break;
default:
cout<<"错误";
}
/**********Program**********/

/**********  End  **********/
cout<<"days:"<<days<<endl;

return 0;
}