Overview

• Preliminaries.
  • Admin.
  • Upcoming Work.
  • Extra Credit.
  • Questions.
• Additional images.
• Debriefing from image analysis.
• Clever code: How'd you do that?
• Code crits: Why'd you do that?

Preliminaries

Admin

• Sit with your project team.
• I will continue to bring you food (or food-like substances) until I am caught up on grading.
  
  • Today: Mints
  • The pipe cleaners are not food.
• We will continue on images first, and then move on to code.
• Happy National Pipe Cleaner Day!
• Note: Unless you have a track meet, you should be in class on Friday.

Reminders

• Office hours this week
  • See http://rebelsky.youcanbook.me.
  • Ask me about other available times.
• Tutor hours
  • Sunday, 3-5 p.m.
  • Sunday-Thursday, 7-10 p.m.
• Review Sessions
  • Wednesday at 8pm in CS commons with Evan
  • Thursday at 10 am with SamR
  • Thursday at 8pm in CS commons with Kumar

Upcoming Work:

• I have posted a sample final examination to the assignments page.
  • We will discuss it in review session.
• No more readings!
• No more lab writeups!
• No more quizzes!
• Exam 4 due tonight!
  • Epilogue due tonight!

Extra Credit

• Send your reports to rebelsky@grinnell.edu with subject "CSC 151 Extra Credit". (Do not include the quotation marks.)
• Send opportunities to me before class with subject "CSC 151 EXTRA CREDIT OPPORTUNITY!"

Academic / Artistic

• Finals week's Inside Grinnell. Tuesday, May 17 at noon in JRC 101. Food served.

Peer

• Humans of Grinnell College on Facebook.
• May 12, 7pm, Wall Theatre, THD-117 Presents The American Family, Scenes from 20th Century American Stage Realism.
• May 13, NC and company at Prairie Canary.
• May 14 improv workshops 1-6pm, Show 7:15-10:15 in Gardner lounge.
• RTS Study Break Monday, 9pm Burling, Cookies

Regular Peer

• Social Dance Workshop Tuesdays 7:00-8:00 in Bucksbaum Dance Studio
• Post-break ExCo on British Politics Wednesdays at 8:00 in JRC 203.
  Just show up; you don't need to sign up.
• Pun club Saturdays at 4pm in Younker
• Electronic Potpourri on KDIC Fridays at Five
• Space Odyssey KDIC Fridays at Six
• Effective Altruism club, 2:30-3:30 Sundays in JRC 226.

Misc

Questions

Can you help with problem 6?

Use direct recrusion, not helper recursion.

Can you help with problem 4? I'm getting empty strings

Think about an input of

    , Sam.

read-char returns #\, Not an alphanumeric KEEP GOING

read-char returns #\space Not an alphanumeric KEEP GOING

read-char returns #\S Alphanumeric Remember the #\S and KEEP GOING

read-char returns #\a Alphanumeric Remember the #\a and KEEP GOING

read-char returns #\m Alphanumeric Remember the #\m and KEEP GOING

read-char returns #. Not an alphanumeric STOP

Are there special cases on problem 4?

read-char returns #, Not an alphanumeric. If you are at the beginning of the word, stop and return what you just read. If you are at the end of the word, ....

Why did you put $car on the board yesterday?

Ideas for problems 1 and 2.

How do you display what's happening as you go through the kernel in problem 2?

Use something like

    (display i) (display " ") (display avec) (newline)

How do I get a procudure to return nothing?

Call (void)

The postcondition sounds hard on problem 6.

I agree. I'm okay with a less formal one for this problem.

Should we do formal postconditions on 3?

Definitely.

How many parameters should we document on problem 3?

Two.

If we call helpers that use car, cdr, vector-ref, etc, should we count those?

Certainly.

Additional images

Debriefing from image analysis

Code