code: public static double getRoundedEvenExp (final double dValue, @Nonnegative final int nScale)
    {
      return getRounded (dValue, nScale, RoundingMode.HALF_EVEN, EDecimalType.EXP);
    }
docs: Round using the {@link RoundingMode#HALF_EVEN} mode and exponential
  representation
  
  @param dValue
  The value to be rounded
  @param nScale
  The precision scale
  @return the rounded value