GradeBook Class Header

Class GradeBook (Fig. 5.9) now contains five additional private data members (lines 18–22)—counter variables for each grade category (i.e., A, B, C, D and F). The class also contains two additional public member functions—inputGrades and displayGradeReport. Member function inputGrades (declared in line 14) reads an arbitrary number of letter grades from the user using sentinel-controlled repetition and updates the appropriate grade counter for each grade entered. Member function displayGradeReport (declared in line 15) outputs a report containing the number of students who received each letter grade.