you will need to use the sentinel loop pattern repeatedly in this program. it will be used to allow the user to enter a new student and then again the students's grades. Use the sentinel value done when the user is finished entering all student grades and two zeros when they are finished entering grades for a particular student.

for each student entered, your program should print out the students name, each scores percentage grade and letter grade, and then the average grade of all assignments for that students

your program may not assumes to know how many students or grades per student are entered and you may not prompt the user for that information.