Re: fuzzy rounding, roundoff, roundup(), et cetera.

From: John Denker <jsd av8n com>
To: gnumeric-list gnome org
Subject: Re: fuzzy rounding, roundoff, roundup(), et cetera.
Date: Sat, 10 Jul 2021 14:52:15 -0700

I coded a version of roundup(xx, pp)

It correctly handles all the tricky cases I know of, including:
  ru 0.24999999999999997 16
  ru 0.1250000001000003 16
  ru 0.49999999999999997 16
  ru 0.1 -15

It comes with a test harness, and an updated preliminary specification,
in my fpu_exceptions.c program.
See the "ru" and "ruspec" commands in particular.
Interested parties are invited to experiment with it.
If you find a case that doesn't seem to be handled correctly,
please let me know.

  https://www.av8n.com/cgit/FPU/tree/fpu_exceptions.c

Follow-Ups:
- question for code pointer | was: Aw: Re: fuzzy rounding, roundoff, roundup(), et cetera.
  - From: newbie nullzwei

References:
- deco-Math project, step 00_a: exact bin and dec 'ranges' (in gnumeric). follow up.
  - From: newbie-02
- Re: fuzzy rounding, roundoff, roundup(), et cetera.
  - From: John Denker

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