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.\" 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)
.\"
.TH STRTOD 3 "March 4th, 1996" "BSD Manual Page" "Library functions"
.SH NAME
strtod \- convert ASCII string to double
.SH SYNOPSIS
.B #include <stdlib.h>
.sp
.BI "double strtod(const char *" nptr ", char **" endptr );
.SH DESCRIPTION
The
.B strtod()
function converts the initial portion of the string pointed to by
.I nptr
to
.B double
representation.
The expected form of the string is optional leading white space as
checked by \fIisspace\fP(3), an optional plus (``+'') or minus sign
(``-'') followed by a sequence of digits optionally containing a
decimal-point character, optionally followed by an exponent. An
exponent consists of an ``E'' or ``e'', followed by an optional plus or
minus sign, followed by a non-empty sequence of digits. If the locale
is not "C" or "POSIX", different formats may be used.
.SH "RETURN VALUES"
The
.B strtod
function returns the converted value, if any.
If
.I endptr
is not
.BR NULL ,
a pointer to the character after the last character used in the conversion
is stored in the location referenced by
.IR endptr .
If no conversion is performed, zero is returned and the value of
.I nptr
is stored in the location referenced by
.IR endptr .
If the correct value would cause overflow, plus or minus
.B HUGE_VAL
is returned (according to the sign of the value), and
.B ERANGE
is stored in
.IR errno .
If the correct value would cause underflow, zero is
returned and
.B ERANGE
is stored in
.IR errno .
.SH ERRORS
.TP
.B ERANGE
Overflow or underflow occurred.
.SH "CONFORMING TO"
ANSI C
.SH "SEE ALSO"
.BR atof (3),
.BR atoi (3),
.BR atol (3),
.BR strtol (3),
.BR strtoul (3)
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