The assignment classes

There are two assignment classes, and they are both derived from the assignment class. The first class is the NumericGrade class, which keeps track of a numeric grade. The second class is the LetterGrade class, which keeps track of a letter grade. The details of the classes are shown in the next figure. The definition of the Assignment class is given in the following figure, and the details about the accessors are omitted for the sake of brevity. The complete code is available on the website for this book.

The details of the NumericGrade and LetterGrade classes are given in separate subsections in this chapter. Once the classes are given, examples are provided to demonstrate how to use the Course class to read the grades from a file and create the necessary assignment objects.

The assignment class is the base class for the NumericGrade and LetterGrade classes. The class only has two slots: the name and a number. The name is used to display the information related to...