Write a c++ program that reads a number of grades from the user and prints the average. Your program must ask the user how many grades(n) will be entered. Write a loop to read n number of grades. If a grade entry is a negative number then print an error message and break the loop. Print average grade.

sample i/o:

Enter how many grades: 5

Enter 5 grades one by one

3

4

7

-10

Invalid Entry, exiting the loop

You have entered 3 grades and the average is 4.66667