coding struk blanja menggunakan long in

#include <iostream.h>
#include <conio.h>
main ()
{
char nama[20];
char pswrd[20];
char a[30];
long int total,x,y,z,kembali;
char awal, ulang;
awal :
clrscr ();
cout<<"User = ",cin>>nama;
cout<<"Password = ",cin>>pswrd;
if (strcmp(nama,"dotrezponding")==0 && strcmp(pswrd, "20121996")==0)
{
cout<<"Selamat Datang, "<<nama;}
else{
clrscr ();
cout<<" Incorrect Password or User name !";}
cout<<"\nDi PT. INDOMARET Indonesia"<<endl;
cout<< endl;
cout<<"\nnama konsument    : ";cin>>nama;
cout<<"=====================================";
cout<<"\nNama Barang   : ";cin>>nama;
cout<<"\nJumlah Barang : ";cin>>x;cout<<endl;
cout<<"\nHarga Satuan  : Rp. ";cin>>y;cout<<endl;
total=x*y;
cout<<"Total : Rp. " << total;cout<<endl;
cout<<"Bayar : Rp. ";cin>>z;cout<<endl;
cout<<"\n===================================";
kembali=z-total;
cout<<"\n==================================="<<endl;
cout<<"Total   : Rp. " <<total;cout<<endl;
cout<<"Bayar   : Rp. " <<z;cout<<endl;
cout<<"Kembali : Rp. " <<kembali;cout<<endl;
cout<<"====================================="<<endl;
cout<<"Terima kasih telah berbelanja di INDOMARET"<<endl;
cout<<endl;
cout<<"Mau input lagi [Y/T] : ";cin>>ulang;
if (ulang=='Y'||ulang=='y')
goto awal;
getch();
bawah:
}