GPA program

1) Define and Analyze: write a program to compute a GPA
Inputs: credits and grades for every course, # of courses
Outputs: the computed GPA
How:
add all the credits (credittotal)
add all the credits multiplied by grade points (pointtotal)
gpa is pointtotal / credittotal
Grade Point System:
4 = A, 3 = B, 2 = C, 1 = D, 0 = F,
+ is +.3 (except A+), - is -.3 (except no D- at JHU)

Example: A 4, B+ 3, c 4, a- 3, d 1
credittotal is 4 + 3 + 4 + 3 + 1 = 15
pointtotal is 4*4 + 3.3*3 + 2*4 + 3.7*3 + 1*1 = 46
GPA 46 / 15 = 3.06666666667

Sample Run:
Welcome to GPA program!
Enter grades and credits for each course, STOP to end:
A 4
B+ 3
c 4
a- 3
d 1
STOP
GPA is 3.06667

2) Write Pseudocode

Main Action
- print welcome
- prompt for input
- initialize creditTotal to 0
- initialize pointTotal to 0
- repeat
  - read grade
  - if grade is not STOP
    - read credits
    - check validity of data
    - add credits to creditTotal
    - convert letter grade to points
    - add credits * points to pointTotal
 until grade is STOP
- set gpa to pointTotal / creditTotal
- display "GPA is", gpa
- if gpa >= 3.5
  - display "Dean's List"
- if gpa < 2.0
  - display "Academic Probation"

Convert letter grade to points:
- if first letter is A,
  - set points to 4
  else if first letter is B
  - set points to 3
  else if first letter is C
  - set points to 2
  else if first letter is D
  - set points to 1
  else
  - set points to 0
- if there is a second character
  - if second is + and first is B, C, D
    - add .3 to points
    else if second is - and first is A, B, C
    - subtract .3 from points
- return points