text: #ifndef DOCGIATHUONG_H
  #define DOCGIATHUONG_H
  
  #include "DocGia.h"
  
  class DocGiaThuong : public DocGia
  {
        private:
  	int m_soSachMuon;
  
        public:
  	DocGiaThuong() : DocGia(), m_soSachMuon(0)
  	{
  	}
  	DocGiaThuong(const char *maDocGia, const char *hoTen, Date ngayHetHan,
  		     int gioiTinh, int soSachMuon)
  	    : DocGia(maDocGia, hoTen, ngayHetHan, gioiTinh),
  	      m_soSachMuon(soSachMuon)
  	{
  	}
  	DocGiaThuong(const DocGiaThuong &dgt) : DocGia(dgt), m_soSachMuon(0)
  	{
  	}
  	DocGiaThuong(const char *maDocGia) : DocGia(maDocGia), m_soSachMuon(0)
  	{
  	}
  	DocGiaThuong(const char *maDocGia, const char *hoTen)
  	    : DocGia(maDocGia, hoTen), m_soSachMuon(0)
  	{
  	}
  
  	void nhap();
  	void xuat();
  	int lePhi();
  };
  
  #endif