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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 .