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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>


       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 .