Path: utzoo!utgpu!water!watmath!clyde!rutgers!sri-unix!quintus!ok
From: ok@quintus.UUCP (Richard A. O'Keefe)
Newsgroups: comp.lang.prolog
Subject: Triangle puzzle
Message-ID: <651@cresswell.quintus.UUCP>
Date: 15 Feb 88 05:03:00 GMT
Organization: Quintus Computer Systems, Mountain View, CA
Lines: 16

To follow up my "review" of "Prolog Programming in Depth",
I thought I'd take one of their examples and show how to
revise it, making it cleaner & faster & so on.  The one
I picked was "TRIANGLE.PRO", pp 234-237.  I got 1/3rd of
the way through typing it in, and found it too painful to
continue.  Has anyone got a machine-readable version of
this program they could send me?  They report that the
Arity Prolog *interpreter* takes "a little over a minute",
but this doesn't mean a great deal, especially as there
appear to be two typos in the jump/3 table.  For what
it's worth:
	jump(5,8,13).	should be jump(5,8,12).
and
	jump(13,21,11).	should be jump(13,12,11).
My version in compiled Quintus Prolog on a SUN-3/50 takes
0.75 seconds, but this doesn't mean much.