1ATOF(3P)                   POSIX Programmer's Manual                  ATOF(3P)
2
3
4

PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
10

NAME

12       atof - convert a string to a double-precision number
13

SYNOPSIS

15       #include <stdlib.h>
16
17       double atof(const char *str);
18
19

DESCRIPTION

21       The call atof(str) shall be equivalent to:
22
23
24              strtod(str,(char **)NULL),
25
26       except that the handling of errors may differ. If the value  cannot  be
27       represented, the behavior is undefined.
28

RETURN VALUE

30       The  atof()  function shall return the converted value if the value can
31       be represented.
32

ERRORS

34       No errors are defined.
35
36       The following sections are informative.
37

EXAMPLES

39       None.
40

APPLICATION USAGE

42       The atof() function is subsumed by strtod() but is retained because  it
43       is  used extensively in existing code. If the number is not known to be
44       in range, strtod() should be used because atof()  is  not  required  to
45       perform any error checking.
46

RATIONALE

48       None.
49

FUTURE DIRECTIONS

51       None.
52

SEE ALSO

54       strtod(),   the   Base   Definitions  volume  of  IEEE Std 1003.1-2001,
55       <stdlib.h>
56

58       Portions of this text are reprinted and reproduced in  electronic  form
59       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
60       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
61       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
62       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
63       event of any discrepancy between this version and the original IEEE and
64       The Open Group Standard, the original IEEE and The Open Group  Standard
65       is  the  referee document. The original Standard can be obtained online
66       at http://www.opengroup.org/unix/online.html .
67
68
69
70IEEE/The Open Group                  2003                             ATOF(3P)
Impressum