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.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\" Distributed under GPL
.\" Based on glibc infopages
.\"
.\" Japanese Version Copyright (c) 2002 Akihiro MOTOKI
.\" all rights reserved.
.\" Translated Sun Sep 22 09:46:55 2002
.\" by Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.TH SIGNBIT 3 2002-08-10 "GNU" "libc math functions"
.SH ̾
signbit \- ư¿ (sign) Ĵ٤
.SH
.B "#include <math.h>"
.sp
.BI "int signbit (" X ");"
.sp
ѥ˥ץ \-std=c99
˥ץ \-lm Ѥ뤳ȡ
.SH
`signbit' ϡư¿Ф
ŬѲǽŪʥޥǤ롣
X ͤӥåȤåȤƤ硢 0 ֤ͤ
.PP
Υޥ `x < 0.0' ƱǤϤʤ
ʤʤ顢IEEE 754 ưɽǤ 0 ĤǤ롣
`-0.0 < 0.0' Ȥӷ̤ϵ (false)
`signbit (-0.0)' 0 ֤ͤ
.SH
δؿ IEC 559 Ƥ롣
(ޤ IEEE 754/IEEE 854 ǤϿǿ侩ؿȤƤ)
.SH Ϣ
.BR copysign (3)
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