MENGALIKAN 2 INTERGER

#include <cstdlib>
#include <iostream>

using namespace std;
class perkalian {
      friend ostream& operator<<(ostream&, const perkalian&);
      friend istream& operator>>(istream&, perkalian&);
public:
       perkalian();
       void hitung_perkaliannya(){hasil = (a*b);}
       private:
               int a,b;
               int hasil;
               };
              
perkalian::perkalian(){
                       cout << " program mengalikan 2 interger \n";
                       cout << " selamat berkarya \n";
                       }

istream& operator >> (istream& in, perkalian& masukkan){
         cout << " masukkan nilai a :";
         in >> masukkan.a;
         cout << " masukkan nilai b :";
         in >> masukkan.b;
         return in;
         }
        
ostream& operator << (ostream& out, const perkalian& keluaran){
         out << " nilai a : " << keluaran.a << endl;
         out << " nilai b : " << keluaran.b << endl;
         out << " hasil kali interger di atas :" << keluaran.hasil << endl;
        
         return out;
}


int main(int argc, char *argv[])
{
    perkalian x;
    cin >> x;
    x.hitung_perkaliannya();
    cout<< x;
  
    system("PAUSE");
    return EXIT_SUCCESS;
}

MENGALIKAN 2 INTERGER