Overview

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

Preliminaries

Admin

• Continue partners!
• Mentor session Monday at 7:00 p.m.
• Friday PSA.
• We'll try to to keep quizzes closer to ten minutes today.

Upcoming Work

• Exam 1.
  • Required prologue due TONIGHT.
  • Exam due in electronic form next Tuesday.
  • Exam due in printed form next Wednesday.
  • Required epilogue due next Wednesday night.
  • Free one day extension
• Lab writeup for lab 10, due Monday, Problem 9 http://bit.ly/151-2015S-lab10
• Reading for Monday:
  • Design and Color

Extra Credit Opportunities

Academic

• Friday, February 6, 12:00 noon, Science 3821, CS Table, Summer Research Opportunities for CS Students
• TEDx Grinnell, sometime in February.

Miscellaneous

• Read and comment on the new Grinnell College Guide to Preventing, Reporting, and Responding to Sexual Harassment and Sexual Misconduct

Peer Support (Morning Section)

• Track and Field, Saturday at 10 a.m., the Bear Fieldhouse. The best race (800 meter) is at noon.
• Julia's radio show, "The Hot Box". Wednesday night/Thursday morning 1:00-2:00 a.m. Next week's theme is to be determined.
• Swimming, Conference Championships, February 13-15, The Osgood

Questions

I've spent twenty minutes on one problem and haven't finished. Can I get partial credit?

I'm sorry that I have to do the demo.

I don't know whether or not I can ask you this question.

You can. I can choose whether or not to answer. Evidence is you'll get some kind of answer.

You have lots of bananas left over. Can I take them home and make banana bread or fried bananas or something?

Certainly.

Quiz!

Lab

Debrief

What did you take as the main learning goals of this lab?

Fixing code to pass one test sometimes breaks other tests. Don't throw away tests!

Make good tests.

Test making can be a tedious process.

Subtle things can go wrong. You need to think about those subtleties.

Some errors are from programmers who have not completely thought through the problem.

Some are from people who have thought carefully but missed one model.

Some are from malicious instructors. (Or people who think very differently about the problem.)

If we want to be fairly comprehensive (for this example), what are some things we should check?

Different shapes: circle, square, non-square rectangle, non-circular ellipse, compound

Different sizes of shapes: unit, large, small

Different coordinates to shift to. Negative and positive, whole numbers vs. exact rationals vs. inexact reals, Zero

Different coordinates to shift from. See above.

Different directions: Left, up, right, down (all combinations?), not at all.

Make sure that you know where the starting object is.