Grade Book (grades.c)

Write a menu driven program that simulates a virtual grade book. The program will

print a menu of several options. These options are: enter grade, nd average, nd

number of certain letter grade, and print the number of total grades entered. Each

function runs and then returns to the main menu except for exit which ends the program,

as per standard procedure the menu is printed inside an innite loop.

For this problem we will use a static xed sized array of 100. You should initialize the

array with a sentinel value `-1' for all 100 positions. When a new grade is entered, it

will replace the sentinel value.

You need to implement the following functions:

void addGrade(int *array, int size);

double average(int *array, int size);

int sum(int *array, int size);

int getSize(int *array);

addGrade: This function gets one new numerical grade from the user and adds it to

the grade book. A valid grade is anything between 0 and 100 inclusive.

average: Average calculates the numerical arithmetic mean of all grades entered and

prints the average value to screen.

sum: This function prompts the user for a letter grade and then calculates how many

entered numerical grades fall into that particular letter grade range; and prints the

count to screen. We will use the standard letter grade bounds for deciding what letter

a given grade corresponds to. The valid choices for letter grades are A, B, C, D, or F.

getSize: This function returns an integer that represents a count of the number of

entered grades. In other words, the returned value should represent the eective size of

the array. To get the count of the entered grades, this function should loop through

the array and check to see which values are not the sentential value (recommended to

use -1, but any invalid input should work that also ts in an int data type). If a value

is not a sentinel value then increase a counter variable until the end of the array. This

counter variable will represent a count of the number of entered grades.

Sample Output:

4

Main menu

1: Add Grade

2: Average Grade

3: Number of a Certain Letter Grade

4: Number of Grades Entered

5: Exit

1

Entered grade: 91

...Print main menu again...

3

Enter a letter grade to find its total count: D

3

...Print main menu again...

4

Number of total grades entered: 4

...Print main menu again...

5

Note: the line ...print main menu again... does not mean to print that literal phrase, it

means to print the menu again and is used here to save space.

Data Type Requirement: Input data is int for the menu, int for the grades in the

array, and char for letter grade choice

Input Validation: Valid menu choices are 1-5, valid grades are between 0 and 100

inclusive.

REMEMBER: This program uses STATIC xed sized arrays.

You have to submit the following le containing the solution of this program

via handin: grades.c

If you could explain that would be great thank you!