Currently the BookData class contains all the data about a book in the stores inventory. Now you will break the class into two classes: one that is base class containing on general data about a book, and another that is a derived class containing data about a book in inventory.
First simplify the BookData class so it contains only the general data about a book. Specifically, modify the BookData class so it contains only the following member variables and member functions:
Member Variables:
boookTitle
isbn
author
publisher
Member Functions:
setTitle
setISBN
setAuthor
setPub
Next you will create a new class named InventoryBook. This class will be derived from the BookData class, and will hold inventory-related data about a book. Specifically, this class will contains the following member variables and member function, which were removed from the original BookData class:

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Member Variables:
dateAdded
qtyOnHand
wholesale
retail
Member Function:
setDateAdded
SetQty
setWholeSale
setRetail
isEmpty
removeBook