This section further evolves class
GradeBook, introduced in Chapter 4 and expanded in Chapters 5–6. Recall that this class represents a grade book used by an instructor to store and analyze a set of student grades. Previous versions of the class process a set of grades entered by the user, but do not maintain the individual grade values in instance variables of the class. Thus, repeat calculations require the user to re-enter the same grades. One way to solve this problem would be to store each grade entered in an individual instance of the class. For example, we could create instance variables
grade10 in class
GradeBook to store 10 student grades. However, the code ...