Program Deret Bilangan Fibonacci (C++)

<iostream.h>
void main()
{
  int fn,fn1,fn2,bil;
  cout<<"Program Deret Bilangan Fibonacci\n";
  cout<<"================================\n\n";

  cout<<"Masukkan Banyaknya Bilangan Deret Fibonacci : ";
  cin>>bil;

  fn1 = 1;
  fn2 = 2;

  cout<<1<<" ";
  cout<<1<<" ";
  fn = fn1+fn2

  do
  {
     cout<<fn<<" ";
     fn2 = fn1;
     fn1 = fn;
     fn = fn1+fn2;
  }
  while(fn < bil);
}


Output :

Program Deret Bilangan Fibonacci