CSC 160 Fall 2010 - Homework 3
Assigned Sept 29 & Oct 4, due WEDS Oct 6

Assigned W 9/29
Textbook Reading (to review today's class):
  • Read Sections 3.1-3.4 of the textbook.

    Do the following exercises from the textbook in DrRacket:
  • Exercise 3.3.3
          a) Define a variable named solid-green-box whose value is a solid green rectangle. Use a width of 10 and a height of 20.
          b) Define a variable named outline-blue-box which is what it sounds like. Use a width of 10 and a height of 20.
          For parts c-g, use only the variable names. Do not use the pictures of the rectangles or the expressions using the rectangle operation, or only half credit will be given.
          c) Write an expression to put the solid box above the outline of a box.
          d) Write an expression to put the solid box on top of (not above) the outline of a box.
          e) Write an expression to put the outline of a box on top of (not above) the solid box.
          f) Write a full sentence describing why the results of d) and e) different. Make sure you put a semicolon at the start of that line to comment it out.
          g) Create a two by two checkerboard where the upper left and bottom right corners have the solid box, and the upper right and lower left corners have the outline of a box.
  • Exercise 3.4.4:
    Write the function contracts for ellipse, circle, and star-polygon only. For each argument, include its data type then describe what that argument is in parentheses. (Make sure this exercise is commented out, as discussed in Section 3.4.3). Note: The contract for triangle will be given in class, so it is omitted from this exercise.

    Do the following at the bottom of your Definitions pane:
  • Write at least one paragraph inside the symbols #| and |# summarizing and giving your opinion of the Joys and Woes article.


    • Textbook Reading (to prepare for next class):
  • Read Sections 3.5-3.10 and 4.1 of the textbook.


    Assigned M 10/4
    Textbook Reading (to review today's class):
  • Read Sections 3.5-3.10 of the textbook.

    Do the following exercises from the textbook in DrRacket:
  • Exercise 3.5.4:
    Hint: A circle's width and height are each twice the radius.
  • Exercise 3.5.9:
    Note: You may use any picture of a person's face for this question. It does not have to be the picture in the textbook.

  • EXTRA CREDIT: Exercise 3.5.8


    • Do the following exercise from the textbook on paper:
  • 3.8.2: Draw a box diagram to prove that (define tri (triangle 15 "solid" "orange")) is a legal expression. Assuming that tri is not already defined.


    • Textbook Reading (to prepare for next class):
  • Read Sections 4.1-4.2 of the textbook.

  • Read this Definition of a Program.



    • Submitting your Assignment
    Your Definitions Pane and Interactions Pane are to be submitted through Moodle. Be sure to include your first and last name as a comment in the first line of your Defintions pane.

    Please submit the Box Diagram on paper in class by the due date.

    The file name for the Definitions Pane needs to be "hw3[LastName]Def.rkt" where:
  • [LastName] is replaced with your last name.
  • For example, if I were submitting this assignment, I would name the file "hw3WittensteinDef.rkt".

    Similarly, the file name for the Interactions Pane needs to be "hw3[LastName]Int.rkt".

    Please let me know if this is not clear or if you are unsure exactly what filename to use. Part of your grade is using the correct filenames.


    GRADING
    Question Point Value
    3.3.3 35
    3.4.4 15
    Joys and Woes 10
    3.5.4 10
    3.5.9 15
    3.8.2 10
    X-CR: 3.5.8 10
    Filenames 5
    Total 100 + 10




    Last Modified: 9/29/10