(ANSI Standard)
#include <math.h> y = frexp( x, expptr );
"frexp" returns the mantissa of "x" as a double precision number less than 1. It also stores an integer N in the memory location indicated by "expptr", such that
x = y * 2**N;
If "x" is zero, "frexp" returns zero for both the mantissa and exponent.
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