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frexp

Extract exponent.

SYNOPSIS:

  double frexp(x, expnt);
   double x;
   int expnt;
  y = frexp(x, &expnt);

DESCRIPTION:

frexp() extracts the exponent from x. It returns an integer power of two to expnt and the significand between 0.5 and 1 to y. Thus  x = y * 2**expn.