Re: Floating point error

• Date: Wed, 13 Mar 1996 19:03:24 PST
• From:
  hpa@zytor.com (H. Peter Anvin)
• Reply-To:
  hpa@zytor.com (H. Peter Anvin)
• Content-Type: text

Followup to:  <96Mar13.131044pdt.7592@silk.parc.xerox.com>
By author:    Pavel Curtis <pavel@parc.xerox.com>
In newsgroup: local.moo
> 
> This is, indeed, an issue in the release and not just in any
> particular operating system.  The change (in 1.8.0) was to add a
> couple more digits to the output of floating-point numbers (DBL_DIG
> + 2 instead of just DBL_DIG, for those who know what that means).  I
> was trying to be sure of getting all of the information in the
> number, especially for DB saving, but I may have gone too far.  I'll
> look into it for 1.8.0p2.
> 

Pavel, use DBL_DIG for tostr() and toliteral(); use DBL_DIG+4 for
saving the database.  Using additional digits for db-saving makes
sense, but not for presentation (becaused I spaced out when I wrote
the original fpmoo patch, I didn't use DBL_DIG but hardcoded %15g and
%22g instead...)

	-hpa


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