Класс из файла

#include<iostream>
#include<string>
using namespace std;
class Toy
{
private:
    string proizv, model;
    int min, max;
    static int count;
public:
    Toy()
    {
        ++count;
    };
    Toy(string proizv, string model, int min, int max)
    {
        this->proizv = proizv;
        this->model = model;
        this->min = min;
        this->max = max;
        ++count;
    };
    void setProizv(string proizv)
    {
        this->proizv = proizv;
    }
    void setModel(string model)
    {
        this->model = model;
    }
    void setDiapazon(int min, int max)
    {
        this->min = min;
        this->max = max;
    }
    void getProizv()
    {
        cout << "Proizvoditel': " << proizv << endl;
    }
    void getModel()
    {
        cout << "Model: " << model << endl;
    }
    void getDiapazon()
    {
        cout << "Ot: " << min << " Do: " << max << endl;
    }
    int getCount()
    {
        return count;
    }
    bool operator<(Toy a)
    {
        return ((proizv < a.proizv) || (proizv == a.proizv) && (model < a.model));
    }

};
int Toy::count = 0;
int main()
{
    Toy Zayc;
    Toy Medved("China", "big", 2, 4);
    Toy Volk("China", "little", 1, 6);
    Zayc.setProizv("Russia");
    Zayc.setModel("little");
    Zayc.setDiapazon(1, 6);
    Zayc.getProizv();
    Zayc.getModel();
    Zayc.getDiapazon();
    Medved.getProizv();
    Medved.getModel();
    Medved.getDiapazon();
    cout<<"count = "<<Zayc.getCount()<<endl;
    bool k=Medved < Volk;
    if (k)
    {
        cout << "True!"<<endl;
    }
    else cout << "False!"<<endl;
    system("pause");
}