contoh program while do c++

#include <iostream.h>
int main()
{
int i,n,jum,angka;
char pil;
pil='y';
while ((pil=='y') || (pil=='Y'))
{
cout<<"input banyak perulangan : ";cin>>n;
jum=0;
i=1;
while (i<=n)
{
cout<<"perulangan ke-"<<i<<":";cin>>angka;
jum=jum+angka;
i++;
}
cout<<"hasil penjumlahan : "<<jum<<endl;
cout<<"apakah anda mau mengulang (y/t) : ";cin>>pil;
}
return 0;
}