Program Cpp Untuk Menampilkan Nama Bulan

Berikut ini saya mencoba membagi source code cpp. untuk menampilkan nama-nama bulan.Berikut ini programnya : 

#include <iostream.h>
#include <conio.h>

class Bulan {
friend istream& operator>>(istream&, Bulan&);
public:
void bulanbulan() ;
private:
unsigned int a;
};



istream& operator>>(istream& in, Bulan& x){
cout<<"Masukkan Angka 1 -12 = ";
in>>x.a;
return in;
}

void Bulan::bulanbulan() {
if (a==1)
   {
      cout << "Bulan Januari " << endl;   }
   else
   {
      if (a==2)
      {
         cout << "Bulan Februari" << endl;      }
      else
      {
         if (a==3)
         {
            cout << "Bulan Maret" << endl;         }
         else
         {
            if (a==4)
            {
               cout << "Bulan April" << endl;            }
            else
            {
               if (a==5)
               {
                  cout << "Bulan Mei" << endl;               }
               else
               {
                  if (a==6)
                  {
                     cout << "Bulan Juni" << endl;                  }
                  else
                  {
                     if (a==7)
                     {
                        cout << "Bulan Juli" << endl;                     }
                     else
                     {
                        if (a==8)
                        {
                           cout << "Bulan Agustus" << endl;                        }
                        else
                        {
                           if (a==9)
                           {
                              cout << "Bulan September" << endl;                           }
                           else
                           {
                              if (a==10)
                              {
                                 cout << "Bulan Oktober" << endl;                              }
                              else
                              {
                                 if (a==11)
                                 {
                                    cout << "Bulan November" << endl;                                 }
                                 else
                                 {
                                    if (a==12)
                                    {
                                       cout << "Bulan Desember" << endl;                                    }
                                    else
                                    {
                                       cout << "Angka yang Anda Masukkan Bukan 1 - 12" << endl;                                    }
                                 }
                              }
                           }
                        }
                     }
                  }
               }
            }
         }
      }
   }
}

void main (){
Bulan b;
cin>>b;
b.bulanbulan();
getch();
}

Semoga Bermanfaat... ^_^