CSC151 2010S, Class 06: Computing with Symbols and Numbers

Admin:
* Reading for Wednesday: Drawings as Values.  
  Somewhat longer, and expects some attempts to interpret code.
* There's Drupal training for students on Saturday.  
  * Note that a lot of offices on campus are likely to be looking for students who are able to use Drupal.  
  * No, you don't get EC for Drupal training.
* Assignment 1 returned via email last night.
* Quiz 1 returned via email last night.  
  * I saw a few problems with repetition, which we'll go over quickly again.
* Are there questions on Assignment 2?
  * What can you assume?  SEE THE ASSIGNMENT
    Basically, the ability to draw a few basic
    shapes (which the 'computer' might do with
    the GIMP, or physical paintnig tools, or
    just in the virtual space we call
    "imagination")
  * What if we can't translate all of part 1 
    to part 2?  That's why there's part 3.
  * Does a rectangle that is both filled and
    outlined count as two things?  Yes.
  * Do two connected lines count as two lines?
    Yes.
  * Should I use 'like' five times in a sentence?
    No.
  * Will Nora be available to help?
    Yes, she'll be here from 7-9 pm EVERY
    Tuesday night.
  * Should we copy-and-paste into the email?
    Yes.  That makes my life more convenient.
* EC: CS Table Friday at noon.  Information distributed via email.
* EC: CS Extras Thursday at 4:30 in 3821 (Talk on summer opportunities in CS).
* Assigned groups for this week: Alphabetical pairs
* For some reason, there are still a few pages that link to the 2009 site.  If you notice one, please let me know.
* There is a lot more in today's outline than I plan to discuss in class.

Overview:
* Questions on the reading.
* Modulo.
* Lab.

Repetition:
* The common mistake
  "To open a jar of peanut butter, do ..."
  "Repeat that action with the jar of jelly"
* This is a nice instance of defining and
  using a subroutine
* It isn't really the kind of repetition we normally talk about
* Repetition is normally
  * Do THE FOLLOWING ACTION(S) until some condition holds
  * Do THE FOLLOWING ACTION(S) THIS MANY TIMES

Questions:
* remainder vs. modulo