nagłówki

//SEGMENT
#ifndef SEGMENT_H
#define SEGMENT_H

#include<string>

class Segment
{
public:
    Segment();
    virtual double pole() = 0;
    virtual double obwod() = 0;
    virtual std::string typ() = 0;
};

#endif

//TROJKAT
#ifndef TROJKAT_H
#define TROJKAT_H

#include "segment.h"

class Trojkat : public Segment
{
    double a;
    double b;
public:
    Trojkat(double a, double b);
    double pole();
    double obwod();
    std::string typ();
};

#endif

//KWADRAT
#ifndef KWADRAT_H
#define KWADRAT_H

#include "segment.h"

class Kwadrat : public Segment
{
    double a;
public:
    Kwadrat(double a);
    double pole();
    double obwod();
    std::string typ();
};

#endif


//PROSTOKAT
#ifndef PROSTOKAT_H
#define PROSTOKAT_H

#include "segment.h"

class Prostokat : public Segment
{
    double a;
    double b;
public:
    Prostokat(double a, double b);
    double pole();
    double obwod();
    std::string typ();
};

#endif