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#include <math.h> double frexp(double x, int *pexp);
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.
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.
ANSI, POSIX
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