C++ Deret Fibonnaci

#include <iostream>

#include <conio>

#include <stdlib>



int fibonacci(int deret)

{

    if (deret==0 || deret==1)

    return deret;

   else

    return fibonacci(deret -1) + fibonacci (deret -2);

}



main()

{

    atas:

    int hasil, deret;

   char ans;

   cout<<"Masukkan Suku Deret ke : "; cin>>deret;

   hasil=fibonacci(deret);

   cout<<"Hasil Deret Fibonacci  : "<<hasil<<endl<<endl;

   lagi:

   cout<<"Apakah Anda Ingin Mencoba Lagi [Y/N] : "; cin>>ans;

   if (ans=='y' || ans=='Y')

    {  system ("cls"); goto atas;}



   if (ans=='n' || ans=='N')

    { system ("cls"); cout<<"=*= TERIMAKASIH =*="; }



   else { system ("cls"); goto lagi; }

   getch();



}