#include <iostream>

using namespace std;

class figura
{
public:
    string nazwa;

    double pole();
    double obwod();

};

double figura::pole()
{
    cout << "Pole figury " << endl;
    return 0;
}

double figura::obwod()
{
    cout << "Obwod figury " << endl;
    return 0;
}

class prostokat : public figura
{
public:
    double podstawa;
    double wysokosc;

    double pole();
    double obwod();
};

double prostokat::pole()
{
    double pole_p;

    cout << "Pole prostokata: ";

    pole_p = podstawa * wysokosc;

    return pole_p;
}

double prostokat::obwod()
{
    double obwod_p;

    cout << "Obwod prostokata: ";

    obwod_p = 2*(podstawa + wysokosc);

    return obwod_p;
}

class trojkat : public figura
{
public:
    double podstawa;
    double wysokosc;

    double pole();
};

double trojkat::pole()
{
    double pole_t;

    cout << "Pole trojkata: ";

    pole_t = (podstawa * wysokosc)/2;

    return pole_t;
}

int main()
{
    figura f;

    f.pole();
    f.obwod();

    prostokat p;

    prostokat * ptr_p = & p;

    p.podstawa = 10;
    p.wysokosc = 5;

    trojkat t;

    trojkat * ptr_t = & t;

    t.podstawa = 5;
    t.wysokosc = 15;

    cout << p.pole() << endl;
    cout << p.obwod() << endl;

    cout << "Wskaznik" << endl;

    cout << ptr_p->pole() << endl;

    cout << t.pole() << endl;

    cout << "Wskaznik" << endl;

    cout << ptr_t->pole() << endl;


    cout << "Hello world!" << endl;
    return 0;
}