On Wed, 3 Mar 2021 07:20:03 GMT, Joe Darcy <[email protected]> wrote:
> I considered @stuart-marks previous suggestion during the code review of
> JDK-8261123 to include a more explicit discussion of why, say, different
> representations of 2 should not be regarded as equivalent. After
> contemplating several alternatives, I didn't find anything simpler than
> Stuart's 2/3 example so I used that as seen in the diff.
>
> A short digression, BigDecimal supports both fixed-point style and
> floating-point style rounding. Floating-point rounding primarily replies on
> the number of precision digits, regards of their scale, while fixed-point
> style rounding prioritizes the scale. The number of digits of eventual output
> is a function of number number of digits in the inputs and the number of
> precision digits in a floating-point style rounding. A floating-point style
> rounding has a preferred scale, rather than a fixed scale based on the
> inputs. The fixed-point style divide method used in the example has a scale
> based on the dividend, allowing a relatively simple expression to show a
> distinction between 2.0 and 2.00.
src/java.base/share/classes/java/math/BigDecimal.java line 3146:
> 3144: * method since the former has [{@code BigInteger},
> 3145: * {@code scale}] components equal to [20, 1] while the latter has
> 3146: * components equals to [200, 2].
s/equals/equal/
-------------
PR: https://git.openjdk.java.net/jdk/pull/2804
