over

#include <iostream>
using namespace std;

class mahasiswa{
private:
float p,l,t,hasil;
public:


void input(){

cout<<"masukan jari jari =";
cin>>p;

cout<<"masukan tinggi =";
cin>>t;
hasil=3.14*p*p*t;


}
void output(){
cout<<"volumenya adalah ="<<hasil;
}
};
int main(){
mahasiswa c;
c.input();
c.output();
}







#include <iostream>
#include <fstream>
using namespace std;

class persegi{
private:
int s;
int l;
public:
friend istream& operator >> (istream&, persegi&);
friend ostream& operator << (ostream&, const persegi&);

};
istream& operator >> (istream& in, persegi& kk){
cout<<"luas persegi "<<endl;
cout<<"masukan sisi =";
in >>kk.s;
kk.l=kk.s*kk.s;
return in;
}
ostream& operator << (ostream& out, const persegi& kk){
out <<"luasnya ="<<kk.l<<endl;
}
main(){

persegi cc;
cin>>cc;
cout<<cc;
}