Demonstrating Class GradeBook

Figure 4.8 contains this application’s main function, which creates an object of class GradeBook and demonstrates its capabilities. Line 9 of Fig. 4.8 creates a new GradeBook object called myGradeBook. The string in line 9 is passed to the GradeBook constructor (lines 9–12 of Fig. 4.7). Line 11 of Fig. 4.8 calls myGradeBook’s displayMessage member function to display a welcome message to the user. Line 12 then calls myGradeBook’s determineClassAverage member function to allow the user to enter 10 grades, for which the member function then calculates and prints the average.