11. Modify class GradeBook, Include a string data member for course instructor’s name, Provide a set function and a get function to change and retrieve it, Modify display Message to output the welcome message and course name.
11. Modify class GradeBook, Include a string data member for course instructor’s name, Provide a set function and a get function to change and retrieve it, Modify display Message to output the welcome message and course name.