Nowy kod

#include <iostream>
using namespace std;
class Czworokat
{
	protected:
		double a,b,c,d;
	public:
		Czworokat()
		{

		}
		Czworokat(double a, double b, double c, double d)
		{
			this->a=a;
			this->b=b;
			this->c=c;
			this->d=d;
		}
		void wypisz()
		{
			cout<<endl<<"Dlugosc boku a:"<<a;
			cout<<endl<<"Dlugosc boku b:"<<b;
			cout<<endl<<"Dlugosc boku c:"<<c;
			cout<<endl<<"Dlugosc boku d:"<<d;

		}
		virtual double oblicz_pole();
};
class Prostokat: public Czworokat
{
	public:
		Prostokat()
		{

		}
		Prostokat(double a, double c)
		{
			this->a=a;
			this->b=a;
			this->c=c;
			this->d=c;

		}
		double oblicz_pole()
		{
			return a*c;

		}
		void wymiary(double a,double c)
		{
			this->a=a;
			this->b=a;
			this->c=c;
			this->d=c;
		}

};
class Kwadrat: public Prostokat
{
	public:
		Kwadrat()
		{

		}
		Kwadrat(double a)
		{
			this->a=a;
			this->b=a;
			this->c=a;
			this->d=a;

		}
		double oblicz_pole()
		{
			return a*a;
		}
		void wymiar(double a)
		{
			this->a=a;
			this->b=a;
			this->c=a;
			this->d=a;

		}

};
int main()
{
	Czworokat *czworokat_1=new Czworokat(1,2,3,4);
	czworokat_1->wypisz();
	return 0;
}