c++

Part 3: Write a program that will read in grades, the number of which is also input by the user. The program will find the sum of those grades and pass it, along with the number of grades, to a function which has a "pass by reference" parameter that will contain the numeric average of those grades as processed by the function. The main function will then determine the letter grade of that average based on a 10point scale. 90100A 8089B 7079C 059F Sample Run: Enter the number of grades 3 Enter a numeric grade between 0-100 90 Enter a numeric grade between 0-100 80 Enter a numeric grade between 0-100 50 The grade is C