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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Floating Decimal Package/Library?
References: <3D345DB3.5080609@cogeco.ca>
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> Finally, I should mention that I am using GNAT. Unless I
> am mistaken, it seemed that the decimal support wasn't
> exactly decimal (I'd have to go back and recheck, but I
> got the impression that it is implemented in binary
> floating point). If it truly is implemented in decimal,
  You got the wrong impression.  Decimal is implemented as
decimal, not binary.
type Change_In_My_Pocket is delta 0.01 digits 3;
  allows values up to $9.99 with one penny precision.
type Gates_Tax_Calculations is delta 1.0 digits 11;
  allows values up to $99 billion with rounding to whole dollars.

> Systems that are written to use binary floats for accounting
> purposes, always leave the programmer with
> the joy all of those "off by one penny" errors.
  Are you aware of the Information Systems Annex?  It's there
to make decimal accounting programming easy.