kalkulator c++

#include <iostream.h>
#include <stdlib.h>



int main ()
{
int pil;
long n1, n2, hasil;

cout<<">>>>>>>>>>>>>>>>>>>>PROGRAM KALKULATOR SEDERHANA<<<<<<<<<<<<<<<<<<<<"<<endl
    <<"1.Operasi Penjumlahan"<<endl
    <<"2.Operasi Pengurangan"<<endl
    <<"3.Operasi Perkalian"<<endl
    <<"4.Operasi Pembagian"<<endl<<endl;
cout<<"Pilih (1/2/3/4) : ";
cin>>pil; cout<<endl;

switch (pil)
{

case 1:
cout<<"Masukkan bilangan pertama : ";
cin>>n1;
cout<<"Masukkan bilangan kedua   : ";
cin>>n2;
hasil=n1+n2;
cout<<n1<<" + "<<n2<<" = "<<hasil<<endl;
break;

case 2:
cout<<"masukan bilangan pertama : ";
cin>>n1;
cout<<"masukan bilangan kedua : ";
cin>>n2;
hasil=n1-n2;
cout<<n1<<" - "<<n2<<" = "<<hasil<<endl;
break;

case 3:
cout<<"masukan bilangan pertama : ";
cin>>n1;
cout<<"masukan bilangan kedua : ";
cin>>n2;
hasil=n1*n2;
cout<<n1<<" x "<<n2<<" = "<<hasil<<endl;
break;

case 4:
cout<<"masukan bilangan pertama : ";
cin>>n1;
cout<<"masukan bilangan kedua : ";
cin>>n2;
hasil=n1/n2;
cout<<n1<<" : "<<n2<<" = "<<hasil<<endl;
break;
default:
cout<<"Maaf masukkan anda salah!!";
}

     system("PAUSE");
     return 0;
}