
Concept explainers
Consider a program that will keep track of the items in a school’s library. Draw a class hierarchy, including a base class, for the different kinds of items. Be sure to also consider items that cannot be checked out.

Explanation of Solution
Class hierarchy for school library:
- In the above diagram, “Library” is the base class, “Book”, “Audio visual material”, and “Periodicals” are the derived classes of the “Library”.
- The “Reference Book”, and “Text Books” are the derived classes of the “Book” class.
- The “Magazine”, and “Newspaper” are the derived classes of the “Periodicals” class.
- Here, every book must be checked out.
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