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Date: Tue, 28 Jun 2005 08:55:52 -0700
From: Yitzchak Scott-Thoennes <sthoenna AT efn DOT org>
To: cygwin AT cygwin DOT com
Subject: Re: HUGE is missing in math.h
Message-ID: <20050628155552.GA2792@efn.org>
References: <83d0063b0506260937400a44d3 AT mail DOT gmail DOT com> <20050627074319 DOT GA383 AT calimero DOT vinschen DOT de> <42C06EAE DOT 60207 AT redhat DOT com>
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On Mon, Jun 27, 2005 at 05:25:02PM -0400, Jeff Johnston wrote:
> Corinna Vinschen wrote:
> >On Jun 26 09:37, Humberto Bortolossi wrote:
> >
> >>Hi!
> >>
> >>I'm trying to port a C program written originally in
> >>Linux to the Microsoft Windows plataform.
> >>
> >>I've realized that math.h under cygwin doesn't
> >>define the macro HUGE, that is defined in
> >>the math.h under linux:
> >>
> >>/* Declarations for math functions.
> >>  Copyright (C) 1991-1993,1995-1999,2001,2002 Free Software Foundation, 
> >>  Inc.
> >>  This file is part of the GNU C Library.
> >>*/
> >>/* SVID mode specifies returning this large value instead of infinity.  */
> >># define HUGE           3.40282347e+38F
> >>
> >>I thought math.h should be quite portable ...
> >
> >
> >HUGE is not portable.  It's not defined in the standard, see
> >http://www.opengroup.org/onlinepubs/009695399/basedefs/math.h.html
> >Use HUGE_VAL instead. 
> >
> >However, other definitions are missing in math.h, like HUGE_VALF,
> >HUGE_VALL, INFINITY and NAN.
> >
> 
> I'll take a look at adding these unless you want to.  HUGE_VALL is the 
> only one that is difficult.

How are you planning on the others?

1.18973149535723176506e+4932L makes a nice long double +infinity for me.

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