CSC151.01 2006S, Class 16: Recursion with Files

Admin:
* Although I have not finished grading HW6, we will go over the harder
  problems in class.
  * unriffle
  * index-of
* Don't forget tomorrow's convocation.
* EC is always listed through the handouts page.
* Yes, you are permitted to ask me questions while you are 
  taking the exam.
  * You may also ask Tutors questions on work assigned before
    the exam.

Overview:
* Files and ports.
* Reading values.
* Reading characters and lines.
* Lab.