contoh program c++ menghitung diskon 10%

#include <iostream.h>
int main ()
{
char nama_brg[20];
double hrg,diskon,total_hrg,uang,kembali;

cout<<"input nama barang :";
cin>>nama_brg;

cout<<"input harga barang :";
cin>>hrg;

if (hrg >=100000)
{
diskon=hrg*10/100;
cout<<"diskon"<<diskon<<endl;
}

else if (hrg <=100000)
{
diskon=hrg*0/100;
cout<<"diskon"<<diskon<<endl;
}

total_hrg=hrg-diskon;
cout<<"total harga :"<<total_hrg<<endl;

cout<<"input jumlah uang :";
cin>>uang;

kembali=uang-total_hrg;
cout<<"kembali :"<<kembali<<endl;
return 0;
}