RealEstate (Working)

#include <iostream>
#include <cstring>
using namespace std;

class RealEstate {
protected:
    char *address;
    int area;
    int price_sqm;
public:
    //RealEstate(){ address = NULL; }
    ~RealEstate(){ delete [] address; }
    // Regular Constructor
    RealEstate(const char *addr = "", int a = 0, int p = 0){
        address = new char[strlen(addr) + 1];
        strcpy(address, addr);
        area = a;
        price_sqm = p;
    }
    // Assignment Operator
    RealEstate &operator = (const RealEstate &r){
        if(this == &r) { return *this; }
        delete [] address;
        address = new char[strlen(r.address) + 1];
        strcpy(address, r.address);
        area = r.area;
        price_sqm = r.price_sqm;
        return *this;
    }
    // Copy Constructor
    RealEstate(const RealEstate &r){
        address = new char[strlen(r.address) + 1];
        strcpy(address, r.address);
        area = r.area;
        price_sqm = r.price_sqm;
    }

    int price() {
        return price_sqm * area;
    }

    void print(){
        cout << address << ", Kvadratura: " << area << ", Cena po Kvadrat: " << price_sqm;
        cout << endl;
    }

    float estateTax() { return 0.05 * price(); }

    friend istream& operator >> (istream &in, RealEstate &r){
        in >> r.address >> r.area >> r.price_sqm;
        return in;
    }

    const char* getAddress() { return address; }
};

class Villa : public RealEstate {
private:
    int luxury;
public:
    Villa(const char *addr = "", int a = 0, int p = 0, int l = 0){
        RealEstate::RealEstate(addr, a, p);
        luxury = l;
    }

    void print(){
        cout << address << ", Kvadratura: " << area << ", Cena po Kvadrat: " << price_sqm;
        cout << ", Danok na luksuz: " << luxury << endl;
    }

    float estateTax() { return (0.05 * price()) + ((price() * luxury) / 100); }

    friend istream& operator >> (istream &in, Villa &v){
        in >> v.address >> v.area >> v.price_sqm >> v.luxury;
        return in;
    }
};

int main(){
    RealEstate re;
    Villa v;
    cin >> re;
    cin >> v;
    re.print();
    cout << "Danok za: " << re.getAddress() << ", e: " << re.estateTax() << endl;
    v.print();
    cout << "Danok za: " << v.getAddress() << ", e: " << v.estateTax() << endl;
    return 0;
}