Жичани инструменти

#include <iostream>
#include <cstring>

using namespace std;


class ZicanInstrument{
protected:
  char ime[20];
  int brZici;
  float osnCena;
public:
  ZicanInstrument(char i[20], int br=0, float osn=0){
    strcpy(ime, i);
    brZici=br;
    osnCena=osn;
  }

  virtual float cena(){
    return osnCena;
  }

  int getBrZici(){
    return brZici;
  }

  bool operator==(ZicanInstrument &zi){
    return (brZici==zi.brZici);
  }

  friend ostream& operator<<(ostream &out, ZicanInstrument &zi){
    out<<zi.cena()<<endl;

    return out;
  }
};

class Mandolina: public ZicanInstrument{
private:
  char forma[20];
public:
  Mandolina(char i[20], int br=0, float osn=0, char f[20]=""):ZicanInstrument(i, br, osn){
    strcpy(forma, f);
  }
  float cena(){
    if (strcmp(forma, "Neapolitan")==0)
      return ZicanInstrument::cena()*1.15; //moze i obicno
    return ZicanInstrument::cena();
  }
};

class Violina: public ZicanInstrument{
private:
  float golemina;
public:
  Violina(char i[20], int br=0, float osn=0, float gol=0):ZicanInstrument(i, br, osn){
      golemina=gol;
  }
  float cena(){
    if(golemina==0.25)
      return ZicanInstrument::cena()*1.1;
    else if(golemina==1)
      return ZicanInstrument::cena()*1.2;
    else
      return ZicanInstrument::cena();

  }
};


void pecatiInstrumenti(ZicanInstrument &zi, ZicanInstrument **i, int n){
  for(int j=0;j<n;j++){
    if(zi==*(i[j]))
      cout<<*(i[j]);
  }
}

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;
}