From: Erik Max Francis <max AT alcyone DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Spotting NaNs
Date: Thu, 23 Apr 1998 08:22:04 -0700
Organization: Alcyone Systems
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Paul Derbyshire wrote:

> I also noticed neither isnan() nor isnanf() appear to be ANSI or
> POSIX. Are they
> widely supported? Or a Gnu extension? or...?

isnan, isinf, and finite (returns true is the parameter is not +-INF or
NAN) are BSD 4.3 routines.  Unfortunately, neither are ANSI or POSIX,
and there is no standard way to tell whether they are available.

-- 
         Erik Max Francis, &tSftDotIotE / mailto:max AT alcyone DOT com
                       Alcyone Systems / http://www.alcyone.com/max/
  San Jose, California, United States / icbm:+37.20.07/-121.53.38
                                     \
                       "Magnificent / desolation."
                                   / Buzz Aldrin, on the Moon