Overview

• Preliminaries.
  • Admin.
  • Upcoming work.
  • About Friday's quiz.
  • Questions on the exam.
  • Other questions.
• Lab.

Preliminaries

Admin

• New partners posted!
• Food!
• Warning! I may not be able to hold a review session this week. I'll keep you posted.
• Exclamation points!
• Both the graders and I are a bit behind. I expect that I'll get you grades before tomorrow's class.
• Study break tonight at 8pm.
• Extra credit:
  • Thursday extra, Thursday @ 4:30 p.m., Sci. 3821, Red/Black trees.
  • CS Table Friday @ noon: Law, Order, and Computers
  • Royce Wolf Piano on Wednesday at noon.
  • Opera on Campus Thursday night in S-L. (if it exists)

Upcoming Work

• Continue working on the exam.
• Tuesday's reading: Transforming Images
• Lab writeup: Exercises 5ace and 6be
  • Subject: CSC 151.02 Writeup 9: Transforming RGB Colors (YOUR NAME)

About Quiz 3

Part 1: Code is in examples/math.rkt.

Basically, each procedure prints stuff out in addition to computing a result. I wanted you to tell me what was printed out.

Part 2:

;;; Procedure:
;;;   limit
;;; Parameters:
;;;   val, a real number
;;;   lower, a real number
;;;   upper, a real number
;;; Purpose:
;;;   limit val so that it is between lower and upper.
;;; Produces:
;;;   limited, a real number
;;; Preconditions:
;;;   lower <= upper
;;; Postconditions:
;;;   If val < lower, the result is lower
;;;   If val > upper, the result is upper
;;;   Otherwise, the result is val.
(define limit
  (lambda (val lower upper)
    (max lower (min val upper))))

Questions on the Exam

Should #9 show the image?

No. It should give back a number that we can use with image-show.

Can we convert images to drawings

Not yet.

Other Questions

Lab

It may be hard for some eyes to distinguish slightly darker versions of colors.