Program mencari Volume tabung

#include <iostream.h>
#include <conio.h>

class volume_tabung {
public:
void volume();
void hitung();
private:
float v,r,t;
};
void volume_tabung::volume(){
cout<<"PROGRAM MENGHITUNG VOLUME TABUNG"<<endl;
cout<<"nilai r : "; cin>>r;
cout<<"nilai t : "; cin>>t;
}
void volume_tabung::hitung(){
v=3.14*r*r*t;
cout<<"Volume Tabung = " << v;
cout<<endl;
}
int main(){
volume_tabung x;
x.volume();
x.hitung();

getch();
return 0;
}