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Write a program that can enter marks for number of students and calculate their Total and class
average, with the following format
ID (int), First (double), Second (double) and Final ( double).
stNum (int) can be calculated during the while loop;
stu_sum ( double) and grade ( Char);
The Grades are: A for 90’s, B for 80’s, C for 70’s, D for 60’s and F for less than 60.
Use while loop to ask if there is more students to enter. Use the switch statement to find the g