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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
.\" 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.\" manual page may be incorrect or out-of-date.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.
.\"
.\" References consulted:
.\" Linux libc source code
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\" 386BSD man pages
.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
.\" Modified 2002-07-27 by Walter Harms
.\" (walter.harms@informatik.uni-oldenburg.de)
.\"
.\" Japanese Version Copyright (c) 1996 Kenji Kajiwara
.\" all rights reserved.
.\" Translated Mon Jul 15 18:20:00 JST 1996
.\" by Kenji Kajiwara
.\" Proof Reading: Takashi Yoshino
.\" Updated & Modified Sun Jun 6 05:30:45 JST 2004
.\" by Yuichi SATO <ysato444@yahoo.co.jp>
.\" Updated & Modified Sat Jan 15 02:32:55 JST 2005 by Yuichi SATO
.\" Updated 2008-09-18, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.TH HYPOT 3 2008-08-05 "" "Linux Programmer's Manual"
.SH ̾
hypot, hypotf, hypotl \- 桼åɵΥؿ
.SH
.nf
.B #include <math.h>
.sp
.BI "double hypot(double " x ", double " y );
.br
.BI "float hypotf(float " x ", float " y );
.br
.BI "long double hypotl(long double " x ", long double " y );
.fi
.sp
\fI\-lm\fP ǥ롣
.sp
.in -4n
glibc εǽޥ
.RB ( feature_test_macros (7)
):
.in
.sp
.ad l
.BR hypot ():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE; or
.I cc\ -std=c99
.br
.BR hypotf (),
.BR hypotl ():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
.I cc\ -std=c99
.ad b
.SH
.BR hypot ()
ؿ
.RI sqrt( x * x + y * y )
֤ͤ
ľѤ 2 դĹ
.I x
.I y
ǤľѻѷμդĹ
ʤ
.RI ( x , y )
ȤεΥǤ롣
֥ƥåפǤϡɬװʾΥСե䥢ե
ʤ褦ˤƷ¹Ԥ롣
.\" e.g., hypot(DBL_MIN, DBL_MIN) does the right thing, as does, say
.\" hypot(DBL_MAX/2.0, DBL_MAX/2.0).
.SH ֤
ȡδؿϡ
ľѤ 2 դĹ
.I x
.I y
ǤľѻѷμդĹ֤
.I x
.I y
̵ξ硢̵礬֤롣
.I x
.I y
ΰ NaN ǡ⤦̵Ǥʤ硢
NaN ֤롣
̤Сե硢ϰϥ顼 (range error) ȯ
ƴؿϤ줾
.BR HUGE_VAL ,
.BR HUGE_VALF ,
.B HUGE_VALL
֤
ξΰ (subnormal) ǡ̤ (subnormal) ξ硢
.\" Actually, could the result not be subnormal if both arguments
.\" are subnormal? I think not -- mtk, Jul 2008
ϰϥ顼ȯ̤֤롣
.SH 顼
δؿƤӽФݤ˥顼ȯȽˡˤĤƤξ
.BR math_error (7)
ȤΤȡ
.PP
ʲΥ顼ȯǽ롣
.TP
ϰϥ顼: ̤ΥСե
.I errno
.B ERANGE
ꤵ롣
Сեư㳰
.RB ( FE_OVERFLOW )
夬롣
.TP
ϰϥ顼: ̤Υե
.\" .I errno
.\" is set to
.\" .BR ERANGE .
եư㳰
.RB ( FE_UNDERFLOW )
夬롣
.IP
ξ硢δؿ
.I errno
ꤷʤ
.\" FIXME . Is it intentional that these functions do not set errno?
.\" They do set errno for the overflow case.
.\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6795
.SH
C99, POSIX.1-2001.
.I double
Ǥδؿ SVr4, 4.3BSD ˤƤ롣
.SH Ϣ
.BR cabs (3),
.BR sqrt (3)
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