Program menghitung keliling persegi panjang

#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;
class persegi {
public :
persegi ();
void input();
void proses();

private :
int p;
int l;
int hasil;
};
persegi::persegi(){
cout<<"=================================\n";
cout<<"Menghitung Keliling Persegi Panjang\n";
cout<<"=================================\n";
}

void persegi::input (){
cout<<"Masukkan Panjang : ";
cin>>p;
cout<<"Masukkan Lebar : ";
cin>>l;

}

void persegi::proses(){
hasil = 2*(p+l);
cout<<"Keiling : "<<hasil;
}

int main(int argc, char** argv) {
persegi Prsg;
Prsg.input();
Prsg.proses();
return 0;
}

Raptor :