To use the gcd code:

gcd.c - should run anywhere, but the ¿ symbol is Unicode

gcd.pas - Free Pascal compile on omega:  /usr/local/bin/fpc

gcd.s.pas - Pascal-S version (with input appended after source)

  On omega:  pascals gcd.s.pas

gcd.old.plz - PL/0 version

  On omega:  cat gcd.plz | plzero
    (where fpc plzero.pas has already been done)

gcd.new.plz - use http://ranger.uta.edu/~weems/NOTES3302/BASELINE/pl0.baseline.html

gcd.html - success depends on your browser.  Doing devious things
with the input or the JavaScript is useful for getting insight with
debugging.

gcd.plg.txt - first version is for omega, second for prolog-in-JavaScript.

On omega:

Either include /usr/local/bin on your path (shell stuff) or
execute with /usr/local/bin/gprolog.

At the prompt:

| ?- 

Enter:

[user].

Now paste the three clauses that are the program:

gcd2(A,A,A).
gcd2(A,B,G) :- A>B, C is A-B, gcd2(C,B,G).
gcd2(B,A,G) :- A>B, C is A-B, gcd2(C,B,G).

followed by control-D.

Next, enter the queries individually.  
Since Prolog can compute several answers, you need
to hit return after each one.

Use control-D to terminate the session.

gcd.rkt - DrRacket is the easiest to use, but requires installation.

gcd.sml.txt - works for both omega and SML-in-JavaScript

On Omega:

Either include /opt/sml/bin on your path (shell stuff) or
execute with /opt/sml/bin/sml.
Enter declarations/functions with copy-and-paste or
load-and-go with:  use "gcd.sml.txt";;

SML-in-JavaScript:

http://www.smlserver.org/smltojs_prompt