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Class 17

Held: Monday, 20 February 2017

We consider one of the central components of algorithms.



  • The parts of an algorithm, revisited
  • Choosing between two options with if
  • Optional evaluation with when
  • Making multiple choices with cond
  • Comparing approaches


News / Etc.

  • New partners.
  • Please make sure to return your computer cards to the jar.
  • Exam 1 returned last night. I’m happy to take questions via email or during office hours. (I’ll probably add some office hours this week.)
  • I have not had time to grade your quizzes. You may get them back on Wednesday (but you may not).
  • Dates in formats like “10/02/2017” are ambiguous. Dates like “10/02/17” are even worse. Please use “YYYY-MM-DD” format for your dates.
  • Please discuss which switching format you and your partner will use
    • Switch every ten minutes
    • Switch midway through class
    • Switch every problem

Upcoming Work

Extra credit (Academic/Artistic)

  • Any of the many Grinnell Prize events.
  • Wednesday, 5pm, Mary Beth Tinker Talk
  • CS Table, Tuesday: Tapia.

Extra credit (Peer)

  • Volleyball vs. Knox Tuesday at 7:00 p.m.
  • Men’s Soccer Wednesday at 4:30 vs. Cornell
  • Volleyball vs. Beloit, Friday at 7:00 p.m.
  • Women’s Tennis vs. St. Norbert, Saturday at 9:00 a.m.
  • Volleyball vs. Lake Forest, Saturday at 1:00 p.m.
  • Women’s Tennis vs. Ripon, Saturday at 3:00 p.m.

Other good things

  • Football, Saturday at 1:00 p.m.