• Continue partners.

Overview

• Preliminaries.
  • Admin.
  • Upcoming Work.
  • Extra Credit.
  • Questions.
  • Quiz.
• Lab.

Preliminaries

Admin

• Beware! It's Friday the 13th (day of class)
• Friday PSA.

Upcoming Work

• Reading for Monday Boolean Values and Predicate Procedures
• Exam 1
  • Prologue TONIGHT http://bit.ly/151-2015F-exam1pro
  • Electronic version next Tuesday: http://bit.ly/151-2015F-exam1
  • Epilogue next Tuesday http://bit.ly/151-2015F-exam1epi
  • Printed version next Wednesday
• Wednesday's Lab writeup (due before class Monday)
  • Email to grader-151-01@cs.grinnell.edu
  • Subject: CSC 151 Lab Writeup Class 12 (Your Names)
  • Exercise: Document irgb-add using six P's (alone or with partner or with some other people in class; limit to groups of 3)
• Lab writeup (due before class Tuesday)
  • Email to grader-151-01@cs.grinnell.edu
  • Subject: CSC 151 Lab Writeup Class 13 (Your Names)
  • Exercise: 3
• Do these lab writeups sooner rather than later, since they will help you on the exam.
  
  • If you get me writeups by Sunday, I'll get you responses by Sunday night.
  • You should do all of the testing lab before doing the testing problem on the exam.

Extra Credit Opportunities

• I remain a little behind in responding to these. Sorry!

Academic

• Art opening (or any visit to the art show): Friday and beyond
  • Talk, 4pm, Sept. 18
  • Opening Reception, 5:00-6:30 p.m., Sept. 18
• John Gerrard talk, "Corn Bomb", Monday at 8pm
• No CS Table next week - It's advising week!
• Wednesday CS Extra Next week, 4:15 in 3821: Ursula Wolz on Building Coding Communities
• Thursday CS Extra Next Week, 4:15 in 3821: SamR on The Architecture of Mediascript

Peer Support

• Pals of PALS, pals@grinnell.edu, normally Saturday at 7:45 am (breakfast included), Sunday at 4:45, and Mondays at 4:45. Requires sign up in advance.
• PALS Fundraiser prep: 824 High Street; Saturday 10:30 a.m.; Food!; Don't come if you are allergic to animals
• Pun Club, Saturdays, 4pm, Way over Younker.
• Singers concert on Family weekend! Sept. 26, 2pm., Sebring-Lewis
• Orchestra concert on Family weekend! Sept. 26, 2pm., Sebring-Lewis
• Softball Alumna Game, 9am on Sunday
• Comedy show forthcoming in Bobs Underground on October 3rd.

Questions

Can I use two <>'s in section?

Yes, but you probably don't want to do that on problem 1. o will be a much better strategy.

Where can I go to think about problem 2?

Recent homework (3).

What should our tests look like?

You should come up with a wide variety of examples so that if it passes those examples, you'll be relatively confident that it will work on everything, unless the writer is incredibly malicious.

For example

    (check-equal? (minutes (add-times (time 1 40) (time 2 40))) 4)

I think your instructions on rackunit are incorrect.

Probably. We'll look at it.

Can we assume that the parameters are all positive for problem 2?

Yes.

But if you can get it to work with negative numbers, too, that would be really awesome. (Not necessary, but like wicked neat.)

Where do our examples go?

Right after your code, commented out by semicolons. Then copy and paste.

Should we cite our partner on assignment 3?

"Idea taken from problem 110213 on assignment 3, written by my partner and me"

Quiz

Lab

"Sketch the preconditions/postconditions"

Can be more informal than normal preconditions/postconditions.

"Think about other things to test"

Write them out, in informal notation. "I should test what happens when one color is black."