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

SYNOPSIS

#include <math.h>
double frexp(doublex, 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.