#include <iostream>

using namespace std;

class kwadrat
{
private:
    double bok;
    double pole;
public:
    kwadrat(double b);
    void obliczpole();
    ~kwadrat();
};

kwadrat::kwadrat(double b)
{
    bok=b;
    cout<< "Utworzono kwadrat o boku: " << bok << endl;
    return;
}

void kwadrat::obliczpole()
{
    pole=bok*bok;
    cout << "Pole kwadratu wynosi: " << pole << endl;
}
kwadrat::~kwadrat()
{
    cout<< "Usunieto kwadrat";
}

int main()
{
    kwadrat k(3.5);
    k.obliczpole();
}