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Re: Hexadecimal floats

To: Neil Booth <neil at daikokuya dot demon dot co dot uk>
Subject: Re: Hexadecimal floats
From: Fergus Henderson <fjh at cs dot mu dot oz dot au>
Date: Mon, 21 May 2001 11:46:27 +1000
Cc: "Joseph S. Myers" <jsm28 at cam dot ac dot uk>, gcc at gcc dot gnu dot org
References: <Pine.LNX.4.33.0105202005530.15795-100000@kern.srcf.societies.cam.ac.uk> <20010520211339.B21605@daikokuya.demon.co.uk>

On 20-May-2001, Neil Booth <neil@daikokuya.demon.co.uk> wrote:
> Joseph S. Myers wrote:-
> 
> > Does C++ include hexadecimal floating point constants?  How does it define 
> > preprocessing numbers?
> 
> I'm 90% sure it's the same as C89.  In other words, no.

That's correct.

The C++ grammar for preprocesing numbers is

	pp-number:
		digit
		. digit
		pp-number digit
		pp-number nondigit
		pp-number e sign
		pp-number E sign
		pp-number .

	nondigit: one of
		universal-character-name
		_
		a ... z
		A ... Z

-- 
Fergus Henderson <fjh@cs.mu.oz.au>  |  "I have always known that the pursuit
                                    |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.

References:
- Hexadecimal floats
  - From: Joseph S. Myers
- Re: Hexadecimal floats
  - From: Neil Booth

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