Overview

• Preliminaries.
  • Admin.
  • Questions.
• Lab.

Preliminaries

Admin

• I'm moving my review session on Thursday to some other time.
  Sorry for the inconsistency.
  (I'm still trying to figure out what time.)
  9:00? 11:00? 2:15? (shortened)
• Still mentor sessions Thursday 7:00-8:00 and 9:00-10:00
• Extra credit:
  • Convocation, Wednesday, noon, JRC 101 (Putin and Pussy Riot)
  • CS Extras, Wednesday at 4:30 in Science 3821: AppDev
  • CS Table, Friday at noon in the Day PDR: NP Completeness

Upcoming Work

• Wednesday's reading: Design and Color
• Yesterday's writeup (due Wednesday): Just send me your unit tests.
• Today's writeup (due Friday): Exercise 4a from Side Effects
  • Email subject: CSC 151 Writeup 7: Side Effects (YOUR NAME(s) HERE)
• Homework 3 due tonight!

Documenting rectangle

Here's what I was hoping for

;;; Procedure:
;;;   rectangle
;;; Parameters:
;;;   left, a real number
;;;   top, a real number
;;;   width, a positive real number
;;;   height, a positive real number
;;;   color, a color
;;; Purpose:
;;;   Create a drawing of a rectangle with the specified characteristics.
;;; Produces:
;;;   rect, a drawing 
;;; Preconditions:
;;;   color is a valid color name.  That is (color? color) holds.
;;; Postconditions:
;;;   rect is a rectangle.  That is (drawing-rectangle? rect) holds.
;;;   (drawing-color rect) is a color equivalent to color.
;;;   (drawing-left rect) is left
;;;   (drawing-top rect) is top
;;;   (drawing-width rect) is width
;;;   (drawing-height rect) is height

Questions

_What should I do if I want to add a short explanation in the middle of my code?

One semicolon

How do you judge concision?

Usually in terms of how short the code is, although we do not distinguish f from make-a-rectangle-of-given-size

How are we supposed to use the width and height variables?

Lab