Exam 3 grading...

Computer part.
problem did best on: 10 points
problem did next best on: 5 points
next best: 3 points
worst problem 2 points

Grades for the parts are in ~/handin/exam3/grades.txt

* exam3.c, part a
3/4 credit if correctly getting input from user and opening file, but missed
the fprintf.

* all the problems
1/2 credit for sort of getting the idea, though missing key parts and it's
not working at all.