ATOF
Section: POSIX Programmer's Manual (P)
Updated: 2003
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 .
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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