Object Oriented Programming with C++, Second Edition

24.6 BOOKS

class RefBooks

    { private:      string40 title ;      char ISBN [15];      int qty;      float price;    public:      void getData();      void show();  };

class TextBooks

    { private:      string40 title;      string15 ISBN;      int qty;      float price;    public:      void getData();      void show();  };

Comment: both the classes are nearly same. The class TextBook may have field “author” as String. The class RefBook may have field “editor” as String. An ISBN Number uniquely identifies a book.