More Operators

The file Grades.java contains a program that reads in a sequence of student grades and computes the average grade, the number of students who pass (a grade of at least 60) and the number who fail. The program uses a loop (Section 3.3 of the textbook). Submit hardcopy of your program after step 4, as well as a transcript of that program running correctly.

1. Compile and run the program to see how it works.

2. Study the code and do the following.
   • Replace the statement that finds the sum of the grades with one that uses the += operator.
   • Replace each of three statements that increment a counting variable with statements using the increment operator.

3. Run your program to make sure it works.

4. Replace the println statement concerning the Class Average with a printf statement so that only two digits are printed after the decimal point.