"Menghitung rerata"

#include <iostream.h>
#include <conio.h>
main()
{
   int tombol,cacah=0;
   float nilai,jumlah=0,rerata;
   clrscr();
   cout<<"Menghitung rerata nilai\n";
   cout<<"Masukan nilai,"<<"isi nilai negatif jika selesai\n\n";
   do
   {
   cacah ++;
   cout<<"data ke-"<<cacah<<"=";
   cin>>nilai;
   jumlah=jumlah+nilai;
   }
    while(nilai >=0);
    rerata=jumlah/cacah;
    cout<<endl;
   cout<<"==============================="<<endl;
    cout<<"\nBanyaknya data = "<<cacah;
    cout<<endl;
   cout<<"-------------------------------"<<endl;
     cout<<"\nJumlah = "<<jumlah;
     cout<<endl;
   cout<<"-------------------------------"<<endl;
      cout<<"\nRerata = "<<rerata;
      cout<<endl;
      cout<<"==============================="<<endl;
      getch();
}