Subversion Repositories Kolibri OS

Rev

Rev 1906 | Go to most recent revision | Show entire file | Regard whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 1906 Rev 3362
Line 1... Line 1...
1 
/* Copyright (C) 2002 by  Red Hat, Incorporated. All rights reserved.
 1 
/* Copyright (C) 2002 by  Red Hat, Incorporated. All rights reserved.
2 
 *
 2 
 *
3 
 * Permission to use, copy, modify, and distribute this software
 3 
 * Permission to use, copy, modify, and distribute this software
4 
 * is freely granted, provided that this notice is preserved.
 4 
 * is freely granted, provided that this notice is preserved.
5 
 */
 5 
 */
- 
 
 6 
/*
- 
 
 7 
FUNCTION
- 
 
 8 
<>--Does floating-point number have negative sign?
- 
 
 9 
 
- 
 
 10 
INDEX
- 
 
 11 
	signbit
- 
 
 12 
 
- 
 
 13 
ANSI_SYNOPSIS
- 
 
 14 
	#include
- 
 
 15 
	int signbit(real-floating <[x]>);
- 
 
 16 
 
- 
 
 17 
DESCRIPTION
- 
 
 18 
The <> macro determines whether the sign of its argument value is
- 
 
 19 
negative.  The macro reports the sign of all values, including infinities,
- 
 
 20 
zeros, and NaNs.  If zero is unsigned, it is treated as positive.  As shown in
- 
 
 21 
the synopsis, the argument is "real-floating," meaning that any of the real
- 
 
 22 
floating-point types (float, double, etc.) may be given to it.
- 
 
 23 
 
- 
 
 24 
Note that because of the possibilities of signed 0 and NaNs, the expression
- 
 
 25 
"<[x]> < 0.0" does not give the same result as <> in all cases.
- 
 
 26 
 
- 
 
 27 
RETURNS
- 
 
 28 
The <> macro returns a nonzero value if and only if the sign of its
- 
 
 29 
argument value is negative.
- 
 
 30 
 
- 
 
 31 
PORTABILITY
- 
 
 32 
C99, POSIX.
- 
 
 33 
 
- 
 
 34 
*/
Line 6... Line 35...
6 
 
 35 
 
Line 7... Line 36...
7 
#include "fdlibm.h"
 36 
#include "fdlibm.h"
8 
 
 37