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.