CS 4480, Fall 2007
Programming Assignment 1
Due Tuesday, September 25, 2007

Write a LISP function to compute n!
Submit a script (see below) with your functon and several test cases to the submission system. Turn in a hard copy in class.

The submission system is at: http or https://pollux.csustan.edu/cshomework

Making a Record of a Program Run (by Dr. Sarraille): Now that you are sure the program is working correctly, let's do another test. This one will be "for the record." Enter "script p1.script" and wait until the computer writes a prompt on the screen again. (There may be a slight delay. The prompt you get now may be different than before.)

Here's an explanation of what you just did: The "script" command turns on a program that makes a record of whatever appears on the screen. The command you entered was "script p1.script" so the record the script program makes will be a file called p1.script.

Enter "a.out" and see your "Hello World!" message written to the screen again. Now enter "exit" to turn off the scripting program. From the time you entered "script p1.script" to the time you entered "exit", all things that were written on the screen were also recorded in the file called p1.script.

Enter clear to clear the screen. Now enter "cat p1.script". This causes the computer to type the contents of the script file you made. It should look something like this:

Script started on Sat Aug 21 19:05:11 2004
jdoe@vega:(~) a.out
Hello World!
jdoe@vega:(~) exit
script done on Sat Aug 21 19:17:37 2004
Note that the script file (named p1.script) starts and ends with "timestamps" that tell when the script was started, and when it was completed. In between it reproduces what you typed.

Now enter "jove p1.script" so you can look at the script file with the JOVE editor. You see your script. You also see "weird" characters in the script like ^M at the end of each line, and maybe some other things. These characters are an undesirable side-effect of the way the scripting program interacts with special characters that handle the terminal display. The weird characters are sometimes visible, and sometimes not, depending on just how you try to display your script file. The characters were not visible when you displayed p1.script with "cat," but they were visible when you used JOVE. Do a C-x C-c command to exit JOVE.

When you turn in a real programming assignment, you will be sending me the source code, plus a script similar to the one you just made. The script will be a record that will show me that you did the right kind of testing of your program.

I require you to run your script through a filter before you send it to me. It's a way to get rid of most of the weird characters, so the script will be more readable. It is easy to do, no matter how big the script is.

Here's how: Enter "cat p1.script | col -b > temp". This command pipes the script file to the input of the command "col -b > temp", which filters out some of the weird characters and writes the output to a file named temp. Now the temp file is the filtered version of the script. Enter "mv temp p1.script" to replace the script file with the new filtered version. Now enter "jove p1.script" again. See how the file has been cleaned up? Good. Exit JOVE again by doing a C-x C-c command.