Note:  Edited Friday August 24, at 2:10pm

Don't let the last problem confuse you too much - just think, you have
the 3 digits coming into your funtion as parameters.  Which one
represents the ones digit?  Which the tens digit?  Which the 100s
digit?  Use multiplication and addition to actually calculate the
correct integer you can build from knowing the values of the
individual digits.  (The books hint makes it all sound way too strange...)


Note:  Edited Friday August 24, at 3am.  

No problems have changed.  Don't use the GUI mentioned in problem 1.
Otherwise all is fine.  Do all 3 problems.

------------------Nothing changed below this line-----------------------

CS1321 Fall 2002
Homework 2
Due Tuesday, August 28, 2001


   The following problems are programming problems to be done using
   DrScheme.  Be sure to save your function definitions by selecting
   "Save Definitions"/"Save Definitons as from the "File" menu of
   DrScheme.

   You will turn in this assignment during class on Tuesday, August
   28, 2001, so bring a printout of your functions to class.
   (Actually make two printouts: one to keep during class, and one to
   turn in at the beginning of class.)



   NOTE FOR YOUR CODING:

   In addition to the contract outline specified in p. 17, we will add
   and name, gtnumber and class/assignment field.  Thus:

          ;; John Doe
          ;; gt1234a
          ;; cs1321 homework <insert the right HW number>
               
          ;; Contract: area-of-ring: number number --> number
          ;; Purpose : to etc. etc. etc.



1. Define a function called Celsius->Fahrenheit, a function that takes
   a temperature in Celsius as a paramter and produces the equivalent
   temperature in Fahrenheit.

   You might remember that the formula to convert a Fahrenheit
   temperature to it's Celsius equivalent is C = (5/9) (F - 32)

   Note:  

   Hardback Book: Page 10
   http://www.htdp.org/2001-01-18/Book/node18.htm

   Online: http://www.htdp.org/2001-01-18/Book/node18.htm
   shows you how to combine your function with a supplied
   gui and interaction system.  Try using the GUI to drive your function
   once you have run it directly.


2. For the past few weeks you've been plodding your way through the
   famous Science-Fiction trilogy Red Mars, Green Mars, Blue Mars (by
   Kim Stanley Robinson).  Every measurement concerning the outside
   temperature is measured not in Celsius or Fahrenheit, but in units
   Kelvin.  You think it would be fun to write a function
   Fahrenheit->Kelvin that allows you to take your familiar
   temperature in Fahrenheit and convert it to a temperature in
   Kelvin.

   Write the function, Fahrenheit->Kelvin.  This function takes in a
   single temperature measure in degrees Fahrenheit.

   NOTE:  A measurement in Kelvin is 273 degrees higher than the equivalent
   measurement in Celsius.


3. problem 2.2.4 from the book 

   "Variables and Programs" section

   Hardcopy: page 11
   Online:  http://www.htdp.org/2001-01-18/Book/node11.htm