School of Engineering and Applied Science Department of Computer Science CSci 133 -- Algorithms and Data Structures I http://www.seas.gwu.edu/~csci133/fall04 Prof. Michael B. Feldman mfeldman@gwu.edu

Step 1: Make sure you have both GW and SEAS accounts.

Step 2: Bring your filesystem up to the CSci 53 state.

• If you took CSci 53 last spring, you have two things to do in this step
• complete the survey form that's in info/survey.txt.
• go to your csci53 directory and erase any *.class files that are left there. This will free up some space. Don't erase your CSci 53 source code, only the class files! Type
  rm *.class
  
• If you did not take CSci 53 last spring,
  
• complete the new-student setup process, which sets up your filesystem, gives you links to the proper Java compiler, and gives you links to the programs from the Lewis & Loftus textbook. This setup page is on the web at
  http://www.seas.gwu.edu/~csci133/fall04/133f04new-student-setup.html.

• a directory csci53
• a link (shortcut) csci53/programs53, which points to the Lewis & Loftus programs
• a subdirectory, csci53/cs1, which contains a Java source file Keyboard.java. This Java class, written by Lewis & Loftus, is what we will often use to get interactive input from the keyboard.
• a subdirectory, csci53/mbf, which contains some classes written by Prof. Feldman.
  
• a few programs in csci53, which you've copied and compiled just to get the feel of the compiler.
• any source files left over from CSci 53.

Step 3: Set up your CSci 133 directory structure.

There is no special setup script for this course, because it's useful for you to understand the details of your file system by setting up some of it yourself. This will help you learn to manipulate UNIX directories.

The .kshrc file (short for "Korn Shell startup file") contains commands that are executed each time you enter a copy of the shell -- when you log in, when you call jcompile, etc. Move to your top-level directory, and bring .kshrc into your editor. It should contain the line . ~csjava/csci53.profile. Immediately below this line, add the line
export CLASSPATH=~:~/csci53:~/csci133:$CLASSPATH
which extends the path the compiler should take in looking for Java sources and class files. In UNIX, the symbol ~ ("tilde") refers to the home directory.
 

Move to your top-level directory, and type each of the following, noting down a description of what each one displays. Note that these are lower case L's and not numeral 1's.
ls -a
ls -l
ls -al
ls -alR
ls -R
The last variant will be very useful in this lab. Each time this handout says "list your file system", use the last command above.
 

In your top-level directory, type
mkdir csci133

Move into your csci133 directory, then type
ln -s ~csjava/programs133
which makes the program library visible to you.

ln -s ../csci53/cs1
ln -s ../csci53/mbf

which lets you "see" the subdirectories of your csci53 directory.

Examine mbf/Screen.java with vi and note that the first actual code line reads package mbf;  
Examine cs1/Keyboard.java with vi and note that the first actual code line reads package cs1;

The subdirectory structure matches the package structure. Java compilers REQUIRE this! In this course, whenever you copy a file from the course distribution, you must put it into the equivalent location in your own file system, otherwise you will surely get compilation errors!

Type

cp programs133/Smiley.java .

cp programs133/ShowInputLoop.java .

Type
jcompile ShowInputLoop.java
jrun ShowInputLoop

jcompile Smiley.java
jrun Smiley