include[HTML_REMOVED]

using namespace std;
int main()
{
int days,month,year;
cout<<”Please input year and month:”;
cin>>year>>month;
switch(month)
{
case 1: case 3: case 5: case 7: case 8: case 10: case 12:
days=31;
break;
case 4: case 6: case 9: case 11:
days=30;
break;
case 2；
if((year%4==0&&year%100!=0)||(year%400==0))
days=29;
else
days=28;
break;
default:cout<<”Errort!”<<endl;
}
cout<<”Days:”<<days<<endl;
return 0;
}