Return to atof.3 CVS log

Up to [CSRG BSD Unix] / 43BSDReno / lib / libc / stdlib

Initial revision

.\" Copyright (c) 1990 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms are permitted
.\" provided that: (1) source distributions retain this entire copyright
.\" notice and comment, and (2) distributions including binaries display
.\" the following acknowledgement:  ``This product includes software
.\" developed by the University of California, Berkeley and its contributors''
.\" in the documentation or other materials provided with the distribution
.\" and in all advertising materials mentioning features or use of this
.\" software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
.\"
.\"	@(#)atof.3	6.2 (Berkeley) 5/16/90
.\"
.TH ATOF 3 "May 16, 1990"
.UC 7
.SH NAME
atof \- convert ASCII string to double
.SH SYNOPSIS
.nf
.ft B
#include <stdlib.h>

double
atof(const char *nptr);
.ft R
.fi
.SH DESCRIPTION
The
.I atof
function converts the initial portion of the string pointed to by
.I nptr
to
.I double
representation.
.PP
It is equivalent to:
.sp
.RS
strtod(nptr, (char **)NULL);
.RE
.SH SEE ALSO
atoi(3), atol(3), strtod(3), strtol(3), strtoul(3)
.SH STANDARDS
.B Atof
conforms to ANSI X3.159-1989 (``ANSI C'').
.SH BUGS
This manual page represents intent instead of actual practice.
While it is intended that
.I atof
be implemented using
.IR strtod (3),
this has not yet happened.
In the current system,
.I atof
translates a string in the following form to a double:
an optional string of spaces, followed by an optional sign (``+'' or ``-''),
followed by a string of digits which may contain a decimal point (``.''),
followed by an optional exponent flag (``E'' or ``e''), followed by an
optionally signed integer.

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.