Copyright (c) 1990 The Regents of the University of California.
All rights reserved.
%sccs.include.redist.man%
@(#)atof.3 6.2 (Berkeley) 05/16/90
All rights reserved.
%sccs.include.redist.man%
@(#)atof.3 6.2 (Berkeley) 05/16/90
ATOF 3 ""
C 7 NAME
atof - convert ASCII string to double
SYNOPSIS
#include <stdlib.h> double atof(const char *nptr);
DESCRIPTION
The
atof function converts the initial portion of the string pointed to by
nptr to
double representation.
It is equivalent to:
strtod(nptr, (char **)NULL);
SEE ALSO
atoi(3), atol(3), strtod(3), strtol(3), strtoul(3)
STANDARDS
Atof conforms to ANSI X3.159-1989 (``ANSI C'').
BUGS
This manual page represents intent instead of actual practice.
While it is intended that
atof be implemented using
strtod (3), this has not yet happened.
In the current system,
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.