• Continue partners.

Overview

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

Preliminaries

Admin

• Happy almost halloween!
  • Candy
  • Zachary made a recursive pumpkin (with one whole level of recursion)
• QQL day (questions, quiz, lab).
• Notes on lab 30 are still available.
• Exam 2 returned at the end of class.
  • Notes on exam 2 to be distributed over the weekend.
• Happy Birthday EG!
• Friday PSA.

Upcoming Work

• Reading for Monday: Iteration
• HW 6 due next Tuesday.
  • May be a few bugs in part A.
• Looking ahead: Exam 3, Project Proposal, Project, Exam 4, Done.
• NO WRITEUP TODAY! (But do the whole lab; you'll learn a lot, and maybe even have some fun.)

Extra Credit Opportunities

• If possible, send me these in advance.

Academic

• Any visit to the current show in the Faulconer gallery.
• R.L. Stephens II events Friday.
• Expressing Yourself Inside and Outside the Classroom: A Faculty Panel. Friday, noon, JRC 209. (With Prof. Katya, SamR, Prof. Praitis, Prof. Willig Onwuachi, and Prof. Byrd)
• CS Table Tuesday: Why people support and bully online.
• Sexual Misconduct at Grinnell College: Results from the 2013 and 2015 Sexual Conduct Surveys. 1-3 pm, November 8, JRC 101.

Peer Support

• Thursday at 7pm, Womens BBall (scrimmage vs MCC)
• Spark Tank, Wednesday, 7pm in Roberts Theatre in Bucksbaum.
• 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.
• Socrates Cafe', Saturdays, Younker, 2pm.
• Pun Club, Saturdays, 4pm, Way over Younker.

Upcoming Peer Support

• November 14, Orchestra Concert, Sebring Lewis, 7:30 p.m.
• Women's Basketball Opening Game, 1pm, Nov. 15, vs. Silver Lake.
• One-act Festival Dec. 5 & 6.
• Showvember, Read the signs

Other Good Stuff to Do

• Women's Soccer Saturday
• Men's Soccer Saturday
• Halloween event Saturday

Questions

What are the differences between functional and imperative?

Pure functional languages assume that when you call a function, it returns a new value and doesn't change anything. Imperative langauges are all about change.

Imperative languages often have a much more explicit order of evaluation

Scheme is both functional and imperative. (And object-oriented.) (And awesome.)

_For Part A on the homework, do you want a chunk of code or a procedure?

I'd prefer a procedure, but the specifications don't make it clear, so I'd accept a chunk of code.

Don't the line lengths vary already?

We'd like you to vary them more explicitly. Make it a percentage of the distance from starting point to ending point.

Quiz

Problem 2 hint: Count UP!

Lab

NO WRITEUP TODAY! (But do the whole lab; you'll learn a lot, and maybe even have some fun.)

    (define image-clear
      (lambda (image)
        (context-set-fgcolor! "white")
        (image-select-nothing! image)
        (image-fill! image)))