projects / apple / libc.git / blame
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|---|---|---|
| 59e0d9fe A |
1 | .\" Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org> |
| 2 | .\" All rights reserved. | |
| 3 | .\" | |
| 4 | .\" Redistribution and use in source and binary forms, with or without | |
| 5 | .\" modification, are permitted provided that the following conditions | |
| 6 | .\" are met: | |
| 7 | .\" 1. Redistributions of source code must retain the above copyright | |
| 8 | .\" notice, this list of conditions and the following disclaimer. | |
| 9 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
| 10 | .\" notice, this list of conditions and the following disclaimer in the | |
| 11 | .\" documentation and/or other materials provided with the distribution. | |
| 12 | .\" | |
| 13 | .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
| 14 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 16 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 17 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 18 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 19 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 20 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 21 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 22 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 23 | .\" SUCH DAMAGE. | |
| 24 | .\" | |
| 25 | .\" $FreeBSD: src/lib/libc/gen/signbit.3,v 1.3 2003/02/24 22:53:20 ru Exp $ | |
| 26 | .\" | |
| 27 | .Dd February 11, 2003 | |
| 28 | .Dt SIGNBIT 3 | |
| 29 | .Os | |
| 30 | .Sh NAME | |
| 31 | .Nm signbit | |
| 32 | .Nd "determine whether a floating-point number's sign is negative" | |
| 33 | .Sh LIBRARY | |
| 34 | .Lb libc | |
| 35 | .Sh SYNOPSIS | |
| 36 | .In math.h | |
| 37 | .Ft int | |
| 38 | .Fn signbit "real-floating x" | |
| 39 | .Sh DESCRIPTION | |
| 40 | The | |
| 41 | .Fn signbit | |
| 42 | macro takes an argument of | |
| 43 | .Fa x | |
| 44 | and returns non-zero if the value of its sign is negative, otherwise 0. | |
| 45 | .Sh SEE ALSO | |
| 46 | .Xr fpclassify 3 , | |
| 47 | .Xr math 3 | |
| 48 | .Sh STANDARDS | |
| 49 | The | |
| 50 | .Fn signbit | |
| 51 | macro conforms to | |
| 52 | .St -isoC-99 . | |
| 53 | .Sh HISTORY | |
| 54 | The | |
| 55 | .Fn signbit | |
| 56 | macro was added in | |
| 57 | .Fx 5.1 . |