3-3.cpp

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#include<iostream.h>
void main()
{
  int year,mon,days,leap;
  cout<<"年 月:";
  cin>>year>>mon;
  switch(mon)
  {
   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%400==0)
            leap=1;
           else if(year%4==0&&year%100!=0)
            leap=1;
           else leap=0l;
          if(leap)  days=29;
            else    days=28;
}
    cout<<year<<"年"<<mon<<"月的天数为:"<<days<<endl;
}