OOP Labs 6 Kvadrat i Pravoagolnik

#include <iostream>
#include <cstring>

using namespace std;

class Kvadrat {
    protected:
        double a;
    public:
        Kvadrat();
        Kvadrat(const double length);
        Kvadrat(const Kvadrat &orig);
        const double perimetar();
        const double plostina();
        void pecati();
};
Kvadrat::Kvadrat(){
    this->a = 0;
}
Kvadrat::Kvadrat(const double length){
    this->a = length;
}
Kvadrat::Kvadrat(const Kvadrat &orig){
    this->a = orig.a;
}
const double Kvadrat::perimetar(){
    return 4.0 * this->a;
}
const double Kvadrat::plostina(){
    return this->a * this->a;
}
void Kvadrat::pecati(){
    cout << "Kvadrat so dolzina a=" << this->a <<" ima plostina P=" << this->plostina() << " i perimetar L=" << this->perimetar() << endl;
}

//pravoagolnik
class Pravoagolnik : public Kvadrat {
    private:
        double x;
        double y;
    public:
        Pravoagolnik();
        Pravoagolnik (const Kvadrat &k, double x, double y) : Kvadrat(k) {
            this->x = x;
            this->y = y;
        }
        Pravoagolnik(const Pravoagolnik &orig);
        const double perimetar();
        const double plostina();
        void pecati();
};

Pravoagolnik::Pravoagolnik(){
    this-> x = 0;
    this-> y = 0;
}
Pravoagolnik::Pravoagolnik(const Pravoagolnik &orig){
    this->x = orig.x;
    this->y = orig.y;
}
const double Pravoagolnik::perimetar(){
    return (2.0 * (this->a + this->x)) + (2.0 * (this->a + this->y));
}
const double Pravoagolnik::plostina(){
    return (this->a + this->x) * (this->a + this->y);
}
void Pravoagolnik::pecati(){
    if(this->x == this->y){
        this->a += this->x;
        Kvadrat::pecati();
        return;
    }
    cout << "Pravoagolnik so strani: " << this->a + this->x << " i " << this->a + this->y << " ima plostina P=" << this->plostina() << " i perimetar L=" << this->perimetar() << endl;
}



//main
int main() {
    int n;
    double a,x,y;
    Kvadrat * kvadrati;
    Pravoagolnik * pravoagolnici;

    cin>>n;

    kvadrati = new Kvadrat [n];
    pravoagolnici = new Pravoagolnik [n];

    for (int i=0;i<n;i++){
        cin>>a;

        kvadrati[i] = Kvadrat(a);
    }

    for (int i=0;i<n;i++){
        cin>>x>>y;

        pravoagolnici[i]=Pravoagolnik(kvadrati[i],x,y);
    }

    int testCase;
    cin>>testCase;

    if (testCase==1){
        cout<<"===Testiranje na klasata Kvadrat==="<<endl;
        for (int i=0;i<n;i++)
            kvadrati[i].pecati();
    }
    else {
        cout<<"===Testiranje na klasata Pravoagolnik==="<<endl;
        for (int i=0;i<n;i++)
            pravoagolnici[i].pecati();
    }
}