.\" Copyright (c) 1990, 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\"     @(#)strtod.3	5.3 (Berkeley) 6/29/91
.\"
.\" Modified Sun Aug 21 17:16:22 1994 by Rik Faith (faith@cs.unc.edu)
.\" Modified Sat May 04 19:34:31 MET DST 1996 by Michael Haardt
.\"   (michael@cantor.informatik.rwth-aachen.de)
.\" Added strof, strtold, aeb, 2001-06-07
.\"
.\" Japanese Version Copyright (c) 1998-1999
.\"   Michihide Hotta and NAKANO Takeo all rights reserved.
.\" Translated Fri Jun 26 1998 by Yasushi Shoji <yashi@yashi.com>
.\" Updated & Modified Sun Mar 14 1999 by NAKANO Takeo <nakano@apm.seikei.ac.jp>
.\" Updated & Modified Sun Jul  1 16:59:53 JST 2001
.\"         by Yuichi SATO <ysato@h4.dion.ne.jp>
.\" Updated & Modified 2006-07-20,
.\"         Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.36
.\"
.TH STRTOD 3 2007-07-26 "Linux" "Linux Programmer's Manual"
.SH ̾
strtod, strtof, strtold \- ASCII ʸư¿Ѵ
.SH 
.B #include <stdlib.h>
.sp
.BI "double strtod(const char *" nptr ", char **" endptr );
.br
.BI "float strtof(const char *" nptr ", char **" endptr );
.br
.BI "long double strtold(const char *" nptr ", char **" endptr );
.sp
.in -4n
glibc εǽޥ׷
.RB ( feature_test_macros (7)
):
.in
.sp
.BR strtof (),
.BR strtold ():
_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
.I cc\ -std=c99
.SH 
.BR strtod (),
.BR strtof (),
.BR strtold ()
ؿϡ
.I nptr
ؤʸΤϤʬ
.IR double ,
.IR float ,
.I long double
ͤˤ줾Ѵ롣

Ϥʸ (Ƭʬ) ϰʲηԤƤ롣
Ƭ˥ۥ磻ȥڡ
˥ץ饹 (\(aq+\(aq) ޤϥޥʥ (\(aq\-\(aq) ε桢
θ (i) 10 ʿ(ii) 16 ʿ(iii) ̵¡
(iv) NAN (׻Ǥʤnot-a-number) Τ줫
(ۥ磻ȥڡϾάǽ
ۥ磻ȥڡ
.BR isspace (3)
Ǽ̤)
.LP
.I "10 ʿ"
 1 ʸʾ 10 ʤο󤫤ʤꡢ
ɽʸ (radix charater)
(˰¸뤬̾ \(aq.\(aq) ޤޤ뤳Ȥ⤢롣
θ 10 ʤλؿ³Ƥɤ
10 ʤλؿ \(aqE\(aq ޤ \(aqe\(aq ȡθ֤鵭 (ά)
Ӥθ³ 1 ʸʾ 10 ʤο󤫤ʤꡢ
10 βǤ뤫ɽ
.LP
.I "16 ʿ"
ϡ"0x" ޤ "0X" Ȥθ³ 1 ʸʾ 16 ʤο󤫤ʤꡢ
ɽʸޤޤ뤳Ȥ⤢롣
θ 2 ʤλؿ³Ƥɤ
2 ʤλؿ \(aqP\(aq ޤ \(aqp\(aq ȡθ֤鵭 (ά)
Ӥθ³ 1 ʸʾ 10 ʤο󤫤鹽졢
2 βǤ뤫ɽ
ɽʸ 2 ʤλؿϡɤ餫¸ߤƤϤʤʤ
.LP
.I ̵
 "INF" ޤ "INFINITY" ɽ졢ʸʸ϶̤ʤ
.LP
.I NAN
 "NAN" (ʸʸ϶̤ʤ) ɽ졢
θ \(aq(\(aq ʸ \(aq)\(aq ³⤢롣
ʸϼ˰¸ NAN ꤹ롣
.\" From glibc 2.8's stdlib/strtod_l.c:
.\"     We expect it to be a number which is put in the
.\"     mantissa of the number.
.SH ֤
δؿϡѴ줿ͤС֤

.I endptr
 NULL ǤʤȤϡѴ˻Ȥ줿ǽʸμʸؤΥݥ󥿡
.I endptr
ǻȤ¸롣

ѴԤʤäȤˤ 0 ֤롣
.I endptr
ȤƤ
.I nptr
 (ѴоݤǤʸγϥɥ쥹) ¸롣

οʸǤ뤬Ѵ̤Сե򵯤
ˤϡץ饹ޤϥޥʥ
.B HUGE_VAL
.RB ( HUGE_VALF ,
.BR HUGE_VALL )
֤ (ͤˤ)
.B ERANGE

.I errno
롣Ѵ̤ե򵯤ˤ 0 ֤ꡢ
.B ERANGE

.I errno
롣
.SH 顼
.TP
.B ERANGE
Сեޤϥեä
.SH 
C89 Ǥ
.BR strtod ()
C99 ǤϻĤ 2 ĤδؿҤƤ롣
.SH 
ԤɤξǤ 0 ֤ǽΤǡ
ץϸƤӽФ
.I errno
 0 ꤷƤӽФ
.I errno
 0 ʳͤɤǧ顼ȯɤȽǤ
ɬפ롣
.SH 
.BR strtol (3)
Υޥ˥奢ڡ򻲾ȡ
ΥڡؿλˡƱͤǤ롣
.SH Ϣ
.BR atof (3),
.BR atoi (3),
.BR atol (3),
.BR strtol (3),
.BR strtoul (3)