he precision of the value, implying that it is in the range 0.95 to
      1.05. Similarly, the precision indicated by the trailing zeros of
      <code>y</code> indicates that the value is in the range 1.09995 to
      1.10005. If we add the two lowest values in the ranges we get 0.95 +
      1.09995 = 2.04995 and if we add the two highest values we get 1.05 +
      1.10005 = 2.15005, so the range of the result of the addition implied by
      the precision of its operands is 2.04995 to 2.15005. The result 