Жичани Инструменти

#include <iostream>
#include <cstring>

using namespace std;

class ZicanInstrument {
protected:
    char ime[20];
    int zici;
    int price;
public:
    ZicanInstrument(char *ime = "", int zici = 0, int price = 0) {
        strcpy(this->ime, ime);
        this->zici = zici;
        this->price = price;
    }
    virtual float cena() = 0;
    bool operator ==(ZicanInstrument &x) {
        return zici == x.zici;
    }
    friend ostream& operator <<(ostream& out, ZicanInstrument &x) {
        out << x.ime << " " << x.zici << " " << x.price << endl;
    }
};
class Mandolina : public ZicanInstrument {
private:
    char forma[20];
public:
    Mandolina(char *ime = "", int zici = 0, int cena = 0, char *forma = "") : ZicanInstrument(ime, zici, cena) {
        strcpy(this->forma, forma);
    }
    float cena() {
        if(strcmp(forma, "Neapolitan") == 0)
            return price + price * 0.15;
        else
            return price;
    }
    bool operator ==(Mandolina &m) {
        return zici == m.zici;
    }
    friend ostream& operator <<(ostream& out, Mandolina &m) {
        out << m.ime << " " << m.zici << " " << m.price << "" << m.forma << endl;
    }
};
class Violina : public ZicanInstrument {
private:
    float golemina;
public:
    Violina(char *ime = "", int zici = 0, int cena = 0, float golemina = 0) : ZicanInstrument(ime, zici, cena) {
        this->golemina = golemina;
    }
    float cena() {
        if(golemina == 0.25)
            return price + price * 0.1;
        else if(golemina == 1)
            return price + price * 0.2;
        else
            return price;
    }
    bool operator ==(Violina &v) {
        return zici == v.zici;
    }
    friend ostream& operator <<(ostream& out, Violina &v) {
        out << v.ime << " " << v.zici << " " << v.price << "" << v.golemina << endl;
    }
};
void pecatiInstrumenti(ZicanInstrument &zi, ZicanInstrument **i, int n) {
    for(int j = 0; j < n; ++j) {
        if(zi == *i[j])
            cout << i[j]->cena() << endl;
    }
}
int main() {
    char ime[20];
    int brojZici;
    float cena;
    char forma[20];
    cin >> ime >> brojZici >> cena >> forma;
    Mandolina m(ime, brojZici, cena, forma);
    int n;
    cin >> n;
    ZicanInstrument **zi = new ZicanInstrument*[2 * n];
    for(int i = 0; i < n; ++i) {
        cin >> ime >> brojZici >> cena >> forma;
        zi[i] = new Mandolina(ime, brojZici, cena, forma);
    }
    for(int i = 0; i < n; ++i) {
        float golemina;
        cin >> ime >> brojZici >> cena >> golemina;
        zi[n + i] = new Violina(ime, brojZici, cena, golemina);
    }
    pecatiInstrumenti(m, zi, 2 * n);
    for(int i = 0; i < 2 * n; ++i) {
        delete zi[i];
    }
    delete [] zi;
    return 0;
}