Write a program that will read in three grades for a student whose first name must also be provided to the program and stored as a character array (of maximum size 15). Ensure that each input grade for each student falls between 0 and 100. For this student, the average grade will be sent into a function that determines a letter grade based on the numerical average.

The function prototype should be: char letterGrade(double avgGrade); Do not use plus or minus grades, but have the following possibilities:

A > 89

<= 89 B > 79

<= 79 C > 69

<= 69 D > 59

59 >= F

Sample Output

This program assigns letter grades to a student based on average performance.

Enter the name of the student:

John

Enter grade 1 for John: 90

Enter grade 2 for John: 90

Enter grade 3 for John: 95

The letter grade for John is: A

Evaluation

20 points The program compiles, and is a reasonable attempt at the solution that incorporates all the required elements indicated: string inputs, functions, etc.

10 points The letter grade, based on the average grade, is correctly determined and displayed

5 points The output is well-formatted with regard to spacing and new lines

5 points The code is well-formatted with regard to indentations and reasonable comments

NB. Your program must make use of the function prototype described above in order to obtain a passing grade.