Create a C++ program to calculate the average of the class using a while loop; assume the class size (i.e. number of students) is not known in advance, you continue reading grades until the user enters no.

a) Use the variables:

grade, sumOfGrades, gradeCount, gradeAvg, char moreGrades

and add any extra variables that are necessary for example a boolean variable

b) Ensure user puts in a valid grade which is 0-100