### Function: frexp

Get significand and exponent of a floating point number.

Breaks the floating point number X into its binary significand SGNFCAND

(a floating point value between 0.5 (included) and 1.0 (excluded))

and an integral exponent EXP for 2, such that:

X = SGNFCAND * 2^EXP

The function returns the cons cell (SGNFCAND . EXP).

If X is zero, both parts (SGNFCAND and EXP) are zero.
(fn X)