This program was written by S. Robbins
no grades yet: name: test1, id: abc, courses: [
   GPA with no grades: 0.0
adding IN grade returned true
one incomplete grade: name: test1, id: abc, courses: [IN]
   GPA with incomplete grade: 0.0
adding invalid grade returned false
one incomplete grade: name: test1, id: abc, courses: [IN]
adding grade A- returned true
two grades: name: test1, id: abc, courses: [IN, A-]
   GPA with A- grade: 3.7
getName returned test1
getId returned abc
getMaxCourses returned 3
getNumCourses returned 2
getGrade(0) returned IN
getGrade(1) returned A-
getGrade(2) returned invalid
getGrade(3) returned invalid
getGrade(-2) returend invalid
adding grade C returned true
three grades: name: test1, id: abc, courses: [IN, A-, C]
   GPA with three grades: 2.85
adding grade B while no room returned false
three grades: name: test1, id: abc, courses: [IN, A-, C]
   GPA with three grades: 2.85

Final Test
GPA for name: Jane Doe, id: 12345abc, courses: [A, B, B+, A-, C, B-, C+, IN, D, F, A-, B-, A, B] is 2.723076923076923