#include <math.h>
double frexp(double x, int *pexp);
Description
This function separates the given value x into a mantissa m in the
range [0.5,1) and an exponent e, such that m*2^e = x.
It returns the value of the mantissa and stores the integer exponent in
*pexp.
Return Value
The mantissa. If the value of x is NaN or Inf, the
return value is NaN, zero is stored in *pexp, and
errno is set to EDOM. If x is zero, *pexp and
the return value are also both zero.
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