redhat man page for frexp

FREXP(3)						     Linux Programmer's Manual							  FREXP(3)

NAME
       frexp - convert floating-point number to fractional and integral components

SYNOPSIS
       #include <math.h>

       double frexp(double x, int *exp);

DESCRIPTION
       The frexp() function is used to split the number x into a normalized fraction and an exponent which is stored in exp.

RETURN VALUE
       The  frexp()  function  returns the normalized fraction.  If the argument x is not zero, the normalized fraction is x times a power of two,
       and is always in the range 1/2 (inclusive) to 1 (exclusive).  If x is zero, then the normalized fraction is zero and zero is stored in exp.

CONFORMING TO
       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO
       ldexp(3), modf(3)

GNU
								    1993-06-06								  FREXP(3)