C++ Menentukan Nama Bulan Dengan Inputan Angka

#include <iostream>
#include <string>

using namespace std;
int main()
{
   string raptor_prompt_variable_zzyz;
   int a;

   raptor_prompt_variable_zzyz ="masukkan angka 1 sampai dengan 12 :";
   cout << raptor_prompt_variable_zzyz << endl;
   cin >> a;
   if (a==1)
   {
      cout << "BULAN JANUARY" << endl;   }
   else
   {
      if (a==2)
      {
         cout << "BULAN FEBRUARY" << endl;      }
      else
      {
         if (a==3)
         {
            cout << "BULAN MARCH" << endl;         }
         else
         {
            if (a==4)
            {
               cout << "BULAN APRIL" << endl;            }
            else
            {
               if (a==5)
               {
                  cout << "BULAN MAY" << endl;               }
               else
               {
                  if (a==6)
                  {
                     cout << "BULAN JUNE" << endl;                  }
                  else
                  {
                     if (a==7)
                     {
                        cout << "BULAN JULY" << endl;                     }
                     else
                     {
                        if (a==8)
                        {
                           cout << "BULAN AUGUST" << endl;                        }
                        else
                        {
                           if (a==9)
                           {
                              cout << "BULAN SEPTEMBER" << endl;                           }
                           else
                           {
                              if (a==10)
                              {
                                 cout << "BULAN OCTOBER" << endl;                              }
                              else
                              {
                                 if (a==11)
                                 {
                                    cout << "BULAN NOVEMBER" << endl;                                 }
                                 else
                                 {
                                    if (a==12)
                                    {
                                       cout << "BULAN DECEMBER" << endl;                                    }
                                    else
                                    {
                                       cout << "INPUTAN SALAH" << endl;                                    }
                                 }
                              }
                           }
                        }
                     }
                  }
               }
            }
         }
      }
   }

   system ("PAUSE");
   return EXIT_SUCCESS;
}