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FREXP(3P)                  POSIX Programmer's Manual                 FREXP(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
       frexp, frexpf, frexpl - extract mantissa and  exponent  from  a  double
       precision number
SYNOPSIS
       #include <math.h>
       double frexp(double num, int *exp);
       float frexpf(float num, int *exp);
       long double frexpl(long double num, int *exp);

DESCRIPTION
       These  functions shall break a floating-point number num into a normal-
       ized fraction and an integral power of 2. The integer exponent shall be
       stored in the int object pointed to by exp.
RETURN VALUE
       For  finite  arguments,  these functions shall return the value x, such
       that x has a magnitude in the interval [0.5,1) or 0, and num  equals  x
       times 2 raised to the power *exp.
       If  num  is  NaN,  a  NaN  shall  be returned, and the value of *exp is
       unspecified.
       If num is +-0, +-0 shall be returned, and the value of *exp shall be 0.
       If num is +-Inf, num shall be  returned,  and  the  value  of  *exp  is
       unspecified.
ERRORS
       No errors are defined.
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       None.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       isnan(),    ldexp(),   modf(),   the   Base   Definitions   volume   of
       IEEE Std 1003.1-2001, <math.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                            FREXP(3P)