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.\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>.
.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
.\" <mtk.manpages@gmail.com>
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" Inspired by a page by Walter Harms created 2002-08-10
.\"
.\" Japanese Version Copyright (c) 2005 Yuichi SATO
.\" and Copyright (c) 2008 Akihiro MOTOKI
.\" Translated Sat Jan 29 05:17:36 JST 2005
.\" by Yuichi SATO <ysato444@yahoo.co.jp>
.\" Updated 2008-09-18, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.TH ILOGB 3 2009-02-04 "" "Linux Programmer's Manual"
.SH ̾
ilogb, ilogbf, ilogbl \- ưλؿȤƼ
.SH
.B #include <math.h>
.sp
.BI "int ilogb(double " x );
.br
.BI "int ilogbf(float " x );
.br
.BI "int ilogbl(long double " x );
.sp
\fI\-lm\fP ǥ롣
.sp
.in -4n
glibc εǽޥ
.RB ( feature_test_macros (7)
):
.in
.sp
.ad l
.BR ilogb ():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500 || _ISOC99_SOURCE; or
.I cc\ -std=c99
.br
.BR ilogbf (),
.BR ilogbl ():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
.I cc\ -std=c99
.ad b
.SH
δؿϰλؿդȤ֤
顼ʤä硢δؿϡб
.BR logb (3)
ؿ
.I int
ǥ㥹ȤΤǤ롣
.SH ֤
ȡδؿ
.I x
λؿդȤ֤
.\" the POSIX.1 spec for logb() says logb() gives pole error for this
.\" case, but for ilogb() it says domain error.
.\" glibc: The numeric value is either `INT_MIN' or `-INT_MAX'.
.I x
ξ硢ΰ襨顼 (domain error) ȯ
.B FP_ILOGB0
֤롣
.\" glibc: The numeric value is either `INT_MIN' or `INT_MAX'.
.\" On i386, FP_ILOGB0 and FP_ILOGBNAN have the same value.
.I x
NaN ξ硢ΰ襨顼 (domain error) ȯ
.B FP_ILOGBNAN
֤롣
.I x
̵礫̵ξ硢
ΰ襨顼 (domain error) ȯ
.B INT_MAX
֤롣
.\"
.\" POSIX.1-2001 also says:
.\" If the correct value is greater than {INT_MAX}, {INT_MAX}
.\" shall be returned and a domain error shall occur.
.\"
.\" If the correct value is less than {INT_MIN}, {INT_MIN}
.\" shall be returned and a domain error shall occur.
.SH 顼
δؿƤӽФݤ˥顼ȯȽˡˤĤƤξ
.BR math_error (7)
ȤΤȡ
.PP
ʲΥ顼ȯǽ롣
.TP
ΰ襨顼: \fIx\fP 0 NaN
.\" .I errno
.\" is set to
.\" .BR EDOM .
(invalid) ư㳰
.RB ( FE_INVALID )
夬롣
.IP
δؿϡξ
.I errno
ꤷʤ
.\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6794
.TP
ΰ襨顼: \fIx\fP ̵
.\" .I errno
.\" is set to
.\" .BR EDOM .
.\" An invalid floating-point exception
.\" .RB ( FE_INVALID )
.\" is raised.
.IP
δؿϡξ
.I errno
ꤻ㳰夲ʤ
.\" FIXME . Is it intentional that these functions do not set errno,
.\" or raise an exception?
.\" log(), log2(), log10() do set errno
.\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6794
.SH
C99, POSIX.1-2001.
.SH Ϣ
.BR log (3),
.BR logb (3),
.BR significand (3)
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