Re: Floating Point comparison problem

here is some strange thing that happens on my system, Archlinux, AMD64
GCC 4.2.2:

int main()
{
  double a = 1.0 / 10.0;
  double b = a * 10.0;

  if( float_equality( a, b ))
    {
      std::cout << "EPSILON at job\n";
    }
  else
    {
      std::cout << "OOPS!" << std::endl;
    }

  return 0;
}
 
opposite to what FAq says this code always outputs: OOPS!

int main()
{
  double a = 1.0 / 10.0;
  double b = a * 10.0;
  const double c = 1.0;

  if( b != c )
    {
      std::cout << "Surprise ! \n" << std::endl;
    }
  else
    {
      std::cout << "== \n";
    }

  return 0;
}

   it always OUTPUTs --> ==

what is wrong here ?