CSC151.01 2006S, Class 15: Recursion with Natural Numbers (2)

Admin:
* Reading: Files in Scheme
* Due: HW6.
  * Some of you are clearly having problems.  Please come 
    see me or a Tutor (or both).
  * Some of you spent significantly more than an hour on 
    the homework.  If that's happening, please let me know.
    About 1: [1]
    About 2: [5]
    About 3: [3]
    About 4: [7]
    About 5: [2]
    About 6: [ ]
    More than 6: [1]
* Assigned: HW7.
  * You must work with someone else.  You may work in teams of 
    up to four people.
* This week's extra credit: Tuesday extra (today), Convo Thursday.
* Friday: Exam distributed.  (No homework next week.)

Overview:
* Q & A.
* Lab.
* Reflection.

/Reflection/

* Solve the basic problem first 
  * For power-of-two
    * Don't worry about negative exponents
    * Don't check the preconditions
* See iota example (next class)