atof(3p) - phpMan

ATOF(3P)                   POSIX Programmer's Manual                  ATOF(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
NAME
       atof - convert a string to a double-precision number
SYNOPSIS
       #include <stdlib.h>
       double atof(const char *str);

DESCRIPTION
       The call atof(str) shall be equivalent to:

              strtod(str,(char **)NULL),
       except that the handling of errors may differ. If the value  cannot  be
       represented, the behavior is undefined.
RETURN VALUE
       The  atof()  function shall return the converted value if the value can
       be represented.
ERRORS
       No errors are defined.
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       The atof() function is subsumed by strtod() but is retained because  it
       is  used extensively in existing code. If the number is not known to be
       in range, strtod() should be used because atof()  is  not  required  to
       perform any error checking.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       strtod(),   the   Base   Definitions  volume  of  IEEE Std 1003.1-2001,
       <stdlib.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the  referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003                             ATOF(3P)