Untitled

#include <iostream>

using namespace std;
class Phong{

private:
    int ma_phong;
    string ten_phong;
    double don_gia;
public:
    static int count;// dua ra tong so phong hien co

    //ham tao mac dinh
    Phong(){
        count ++;//moi khi khoi tao thi se tinh them 1 phong
    }
    // ham tao co tham so
    Phong(int _ma_phong, string _ten_phong, double _don_gia){
        ma_phong = _ma_phong;
        ten_phong = _ten_phong;
        don_gia = _don_gia;
        count ++;//moi khi khoi tao thi se tinh them 1 phong
    }


    //ham huy
    ~Phong(){
        count --;//moi khi huy thi se giam di 1 phong
    }
    //getter va setter
    double getDon_gia(){
        return don_gia;
    }
    void setDon_gia(double x) {
        don_gia = x;
    }
    //ham nhap
    void import(){
        cin >> ma_phong >>ten_phong >> don_gia;
    }

    static int soPhong(){
        return count;
    }


};

class PhongDacBiet : public Phong{
 public:
    double don_gia;

    PhongDacBiet(int _vi_tri, double _chi_so_phuc_vu, double _gia_co_ban){
        don_gia = (_vi_tri + _chi_so_phuc_vu) * _gia_co_ban;
    }
};

class PhongThuong : public Phong{
 public:
    double don_gia;

    PhongThuong( double _he_so_phong, double _gia_co_ban){
        don_gia = _he_so_phong * _gia_co_ban;
    }
};


bool sosanh(Phong x, Phong y){
    if(x.getDon_gia() > y.getDon_gia()) return true;
    else return false;

}


int main()
{
    return 0;
}