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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 dif-
       fer (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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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)