Assignment 5 for CSCI 431

• Running Squeak

  Squeak has been installed on all of the Sun workstations (i.e., flat-rock, hendersonville, marshall, brevard, leicester, and alexander). If you set the DISPLAY environment variable, you can remote logon to anyone of the Suns from any other workstation and run Squeak (when doing this, be sure that the machine that you are working on supports an X-windows display---any workstation will do this).

  Squeak requires an image file in which it saves your working environment. In order to run Squeak, you must have an initial copy of an image file, this can be created using the shell script:

        /usr/local/bin/runsqueak
  

  This script will check for the existence of a directory ~/CSCI431-squeak (in your home directory.) If it doesn't find the directory (eg. the first time it runs), the script will create it, populate it with the files needed and then invoke the Squeak program.

  In summary, to run Squeak, run the shell script:   /usr/local/bin/runsqueak   on a Sun workstation.

  
  

• Your Assignment

  
  

  1. Part 1: Creating Smalltalk Classes

     Follow the instructions on the attached page and submit the file that you create as your solution to Part 1 of this assignment.

     
     

  2. Part 2: Exercises with Loops and Conditionals
     1. Program 1:
        Write a procedure called sum that has one parameter called max. When called, the procedure should print the sum of all numbers between 1 and max.
     2. Program 2:
        Write a procedure called even that has one parameter called number. When called, the program should print "even" if the value of number is even, or "odd" if number is odd.
     3. Program 3:
        Write a procedure called repeat that has 2 parameters: count and text. When called, the procedure should repeat text count times. Each occurrence of text should appear on a separate line.

     
     

  3. Part 3: Looking at the Object Hierarchy
     
     1. List all parents and children of the Array class starting with the top level class in the Hierarchy. Does Smalltalk support multiple inheritance?
     2. What class does the literal 3.2 belong to? Describe a method that can be applied to this class.