四核

#include
using namespace std;
int main()
{
int year,month,day;
cout<<“请输入年份”<<endl;
cin>>year;
cout<<“请输入月份”<<endl;
cin>>month;
switch(month)
{
case 1:day=31;break;
case 2:if( year%4000&&(year%40 && year%100!=0))
day=29;
else day=28;break;
case 3:day=31;break;
case 4:day=30;break;
case 5:day=31;break;
case 6:day=30;break;
case 7:day=31;break;
case 8:day=31;break;
case 9:day=30;break;
case 10:day=31;break;
case 11:day=30;break;
case 12:day=31;break;
default:cout<<“error\n”;break;
}
cout<<“本月有”<<day<<“天”<<endl;
return 0;
}