CSC 160 Fall 2006 - Homework 3
Assigned Sept 26, due TUESDAY Oct 3

Log the time you spent on this homework by creating your own log sheet.

Read the article on Pair Programming.

Read Sections 2.2 and 2.3 of the online textbook.

Read Chapter 4 of the Simply Scheme textbook.

The Assignment
The assignment may be done alone or in pairs using the ideas in the Pair Programming article. (You cannot pair up with the same person more than once during the semester.)

Questions 1, 3, and 4 may be done in either the Simply Scheme language mode or the Beginning Student language mode.
Question 2 will only work in the Simply Scheme language mode.
Whenever defining a Scheme function, you must include an example of how the function is called, along with what its answer "should be". (For an explanation of this requirement, click here.)

Please answer any 3 of the following 4 questions. (Each question is worth 30 points. If you choose to answer all four, you can get up to 10 points extra credit on this assignment.)

  • 1. Simply Scheme exercise 4.5b: Define a Scheme function to convert a temperature from Fahrenheit to Celsius. [Hint: The formula is: C = (5/9)(F - 32)].

  • 2. Simply Scheme exercise 4.6: Define a Scheme function fourth that computes the fourth power of its argument. [Please write it just one way, the way of your choice. You can use expt, sqr, and/or * in the function body.]

  • 3. Additional Question: Define a Scheme function average3 that will return the average of 3 exam scores.

  • 4. Additional Question: On page 51 of Simply Scheme, the sum-of-squares function is written. Please write a similar function called sum-of-cubes, which does what it says, finds the sum of the cubes of two numbers. [Note: Make sure you copy (or re-type) the cube function from the 9/26 lecture slides into the Definitions Window before writing sum-of-cubes.]


    Submitting your Assignment
    Please submit your Definitions Window and your Log Sheet, using the Digital Dropbox in the Tools menu on Blackboard. Be sure to include your first and last name!

    The file name for the Definitions Window needs to be "hw3[section][LastName]Def.scm" where:
  • [section] is replaced by -01 for the 3:05 class and -02 for the 4:30 class
  • [LastName] is replaced with your last name.
  • For example, if I were submitting this assignment and I were in the 3:05 class, I would name the file "hw3-01WittensteinDef.scm".

    Similarly, the file name for the Log Sheet needs to be "log3[section][LastName].doc".


    GRADING
    Question Point Value
    First 30
    Second 30
    Third 30
    Fourth 10 (X-CR)
    Log 10




    Last Modified: 10/2/06