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From: ForthNet@willett.pgh.pa.us (ForthNet articles from GEnie)
Newsgroups: comp.lang.forth
Subject: Files on-line
Message-ID: <2739.UUL1.3#5129@willett.pgh.pa.us>
Date: 13 May 91 11:56:21 GMT
Organization: (n.) to be organized.  But that's not important right now.
Lines: 37

Category 1,  Topic 3
Message 120       Mon May 13, 1991
D.RUFFER [Dennis]            at 00:13 EDT
 
>>> New File <<<

[ If you would like a copy of any of these files, drop me a note at
  one of the addresses at the end of this message.  Binary files are
  UUencoded.  In order for me to answer your request, you MUST:
    Include the line containing the file name.  (so I know what you want.)
    Include your email address in the _body_ of the message.
	You _must_ include an address *relative to* the InterNet.
  -Doug Philips]


  No. File Name      Type Address       YYMMDD    Bytes Accesses Lib
 2428 TURTLES.ARC     X   R.BERKEY      910512    16384      1    10
  Desc: Turtle graphics / division demo

This code gives a visual tour of Zafar Essak's 1986 FORML Conference
Proceedings paper, "Turtles Explore Floored Division" (cited as an example of
the usefulness of truncated-to-zero division).  No programming required!  Many
variations of turtle-drawn circles appear, using different division
algorithms, rounding adjustments, and implementation approaches.  The most
significant compares a turtle-circle drawn with unrounded truncated-to-zero
division alongside a "high precision" turtle-circle, showing a greater than
20% error in the length of the diameter.  This code requires an EGA color
adaptor for an IBM-AT.  Software required is F-PC, and the code has been
tested on F-TZ 3.21 and F-PC 3.50.  To run from the DOS command line, type: F-
PC MKTURTLE OK CLS BYE

Keywords: F-PC, FPC, FTZ, MSDOS, SOURCE, GRAPHICS, DIVISION, FORML
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