Homework 0

Note: This assignment is not required, and you will submit nothing as proof that you completed it. We do, however, strongly recommend that you try it out, before Homework 1 is distributed. The purpose of Homework 0 is to become acquainted with the local programming environment. Without this, future assignments will be unnecessarily difficult.

In this assignment, you will download a program from the Web and compile it on your local machine, using a simple step-by-step process. This is a hurdle we must leap in order to have interesting programming homeworks later.

The program we'll run tests the primality of a number. In Homework 1, we'll modify this program for efficiency, but for now we just want to run it at least once.

You may run into problems in the course of following these steps. If so, find a friend, ask a TA, or contact the instructor.

• Set up the system.
  1. We'll use the CMU Macintosh system, so find one and log in.
  2. Create a folder in which to store this homework.
  3. In the Finder, Open Netscape Navigator. (It may be in the ``Netscape Navigator'' folder, which itself may be in the ``WWW'' folder.)
  4. In Netscape, go to the course home page (http://www.cs.cmu.edu/~cburch/pgss/). Select the link labeled ``Prime.java''. Select ``Save As...'' from the File menu, and save the file (in the folder you created) as ``Prime.java''.
  5. Quit Netscape.
• Create the project.
  1. In the Finder, Open CodeWarrior IDE. (It's probably in the ``Programming'' folder, in the folder titled ``CodeWarrior'', in its folder titled ``Metrowerks CodeWarrior''.)
  2. In CodeWarrior, select ``New Project...'' from the File menu. This will bring up a dialog box.
  3. Click on the triangle next to ``Java'', and select ``Java Application''. Unselect the checkbox for ``Create Folder''. Click ``OK''.
  4. Enter the folder you created in the new dialog box. Name the project ``Prime.proj'', and click ``Save''.
  5. Select ``TrivialApplication.java'' in the project window and choose ``Remove Files'' from the Project menu.
  6. Choose ``Add Files...'' from the Project menu, and select ``Prime.java''. Click ``Add'', then ``Done''. This should insert ``Prime.java'' into the project window.
  7. Choose ``Project Settings'' from the Edit menu. Select ``Java Project'', and type ``Prime'' in place of ``TrivialApplication'' (in the ``Main Class'' text field). Click on ``OK''.
• Debug and run the program.
  1. Still in CodeWarrior, double-click on ``Prime.java'' in the project window. This should bring up the code for you to view and edit. Find the function PrimeTestAll, and look over it. (This is the part you'll modify in Homework 1.)
  2. Add an error to ``PrimeTestAll''. (Remove the line ``int i;'', for example.) Now select ``Run'' from the Project menu.
  3. If you successfully inserted an error, a window should appear describing some problems with the program. Close the window and undo your change.
  4. Now select ``Run'' from the Project menu again. This should begin the application. Go ahead and try a few numbers to make sure the code is correct. (Do this by typing something in the text field and clicking ``Test''. The answer will appear at the top of the dialog.) Click ``Quit'' to quit.
• You're done! If you don't feel comfortable with any of the above steps, try them again. Be sure to log out (through the right-hand key-icon menu) after you're finished.