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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 dif-
       fer (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 normalized 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, 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                            FREXP(3P)