Write a program GPA.java to calculate the GPA of student grades. Program will ask user to enter the course units and the grade point for all the courses. Calculate and print the total number of courses, total units, total grade point and GPA. If no course is entered, print No courses entered.

Sample output:

Enter course 1 units (-1 to exit): 3.0

Enter grade point (A-4.0, B-3.0, C-2.0, D-1.0, F-0.0): 4.0

Enter course 2 units (-1 to exit): 4.0

Enter grade point (A-4.0, B-3.0, C-2.0, D-1.0, F-0.0): 3.0

Enter course 3 units (-1 to exit): 1.0

Enter grade point (A-4.0, B-3.0, C-2.0, D-1.0, F-0.0): 4.0

Enter course 4 units (-1 to exit): 2.0

Enter grade point (A-4.0, B-3.0, C-2.0, D-1.0, F-0.0): 2.0

Enter course 5 units (-1 to exit): -1

Total number of courses: 4

Total Units: 10.0

Total Grade Points:32

GPA: 3.20