// ConsoleApplication2.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <time.h>
#include <cstdio>
#include <string>


using namespace std;

#include <iostream>
#include <stdio.h>
#include <tchar.h>
#include <math.h>

class Figura {
public:
    virtual double pole() {
        return 0.0;
    }
    virtual double obwod() {
        return 0.0;
    }
};

class Prostokat : public Figura {
protected:
    double a;
    double b;
public:
    Prostokat(double a, double b) {
        this->a = a;
        this->b = b;
    }
    ~Prostokat() {}
    virtual double pole() {
        return (this->a*this->b);
    }
    virtual double obwod() {
        return (this->a * 2 + this->b * 2);
    }
};

class Elipsa {
protected:
    double a;
    double b;
public:
    Elipsa(double a, double b) {
        this->a = a;
        this->b = b;
    }
    ~Elipsa() {}
    double pole() {
        return (this->a*this->b*3.14);
    }
    double obwod() {
        return ((3 / 2)*(this->a + this->b) - (sqrt(this->a + this->b))*3.14);
    }
};

class Kwadrat : public Prostokat {
    friend std::ostream& operator<< (std::ostream &out, const Kwadrat &val);
public:
    Kwadrat(double a) : Prostokat(a, a) { };
};

class Okrag :public Elipsa {
public:
    Okrag(double r) : Elipsa(r, r) {};
    double pole() {
        return Elipsa::a*Elipsa::b*3.14;
    }
    double obwod() {
        return 2 * Elipsa::a*3.14;
    }
};

std::ostream& operator<< (std::ostream &out, const Kwadrat &val) {

    out << val.a;
    return out;
}

int main(void) {

    return 0;
}