Modify the Student class of Exercise E8.7 to compute grade point averages. Methods are needed to add a grade and get the current GPA. Specify grades as elements of a class Grade. Supply a constructor that constructs a grade from a string, such as "B+". You will also need a method that translates grades into their numeric values (for example, "B+" becomes 3.3).

Data from Exercise E8.7

Implement a class Student. For the purpose of this exercise, a student has a name and a total quiz score. Supply an appropriate constructor and methods getName(), addQuiz(int score), getTotalScore(), and getAverageScore(). To compute the latter, you also need to store the number of quizzes that the student took.