Write a C++ program that can maintain grades for a simple course.

Functional requirements

Your program will be command driven. It will repeatedly print a prompt, read a command, the execute a command. Grade information is stored in a text file name grades.txt, located in the same directory as the executable. The course is assumed to have exams and assignments, each worth 50% of the grade. Within a category, all entries are weighted equally. All updates should be saved to the file after each command.

q

Quit the program.

addS

Add a new student. If a student of that name already exists an error message is displayed and no changes are made.

addA

Add a new assignment. Assignments are not named, they are indexed starting at 1.

addE

Add a new exam. Exams are not named, they are indexed starting at 1.

grade

For each assignment, display the student's grade and prompt for a new grade. If no grade has been entered a 0 is displayed for the current grade. If the user enters no data the current grade is kept. If an invalid grade is given (outside of 0-100, oir non-numeric), the program reprompts.

Then repeat the process for each exam.

gradeA

For each student prompt for that student's grade on the given assignment.

gradeE

For each student prompt for that student's grade on the given exam.

display

Print a table of all entered grades, with the overall grade displayed in the right-most column.

EXAMPLE

Student Test1 Test2 Assignment 1 Assignment 2 Average Grade

0 0 0 0 F

0 0 0 0 F

Class Average = 0