1) Grades with input validation (C++). Modify grade programs with arrays

and functions. (the program should minimally have functions for average,

min, max, # above average, etc. - total of 4 functions) Add logic (to the

main) so that if the user enters an invalid grade (lower than zero, higher

than 100), the user will be issued an error message and then be allowed

to reenter the grade. This will repeat as long as the user enters invalid

grades. You will need a "While" loop. (See next slide for hints.) (filename

= "grade-validation.cpp"). Include adequate testing and sample output.