GradeAverage

Write a C program that calculates and prints the average of several grades entered by the user.
The program should first prompt the user to enter the number of grades to process (at least 2 grades must be entered by user!) .
It should then prompt the user for each grade. As each grade is entered, the program should ensure that the grades entered are in the grade range of zero to 100. If the grade is not in that range, an error message should be displayed (as shown below), and the user should be re-prompted for a grade. Any bad grades entered should not be included in the average calculation.
Once all values are entered, the program should calculate and print the average of all of the positive values entered, rounded to the nearest whole number.
At the end display a message for the appropriate letter grade as shown here:
90 – 100: A 80 – 89: B 70 – 79: C 60 – 69: D 0 – 59: F
This program will feature the if statement as well as programming techniques for data validation. I call it a trap loop. It traps the user into entering valid data.
The dialog with the user should be as follows:
This program calculates the average of as many grades you wish to enter.
First, enter the number of grades to process: 4
Now enter the 4 grades to be averaged.
Enter grade #1: 100 Enter grade #2: 80 Enter grade #3: -20 *** Invalid entry. Grade must be 0 to 100. *** Enter grade #3: 25 Enter grade #4: 54
The average of the 4 grades entered is 65
You have a letter grade of D

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