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 correspond-
       ing 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, Standard for Information Technol-
       ogy -- 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)