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Present rounding modes as a table

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Benjamin Morel 2015-01-27 17:57:57 +01:00
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@ -102,16 +102,18 @@ When dividing a `BigDecimal`, you can also specify the scale of the result:
There are a number of rounding modes you can use:
- `UNNECESSARY`: assumes that rounding is unnecessary, and throws an exception if rounding was in fact necessary.
- `UP`: rounds away from zero.
- `DOWN`: rounds towards zero.
- `CEILING`: rounds towards positive infinity. If the result is positive, behaves as for `UP`; if negative, behaves as for `DOWN`.
- `FLOOR`: rounds towards negative infinity. If the result is positive, behave as for `DOWN`; if negative, behave as for `UP`.
- `HALF_UP`: rounds towards "nearest neighbor" unless both neighbors are equidistant, in which case round up. Behaves as for `UP` if the discarded fraction is >= 0.5; otherwise, behaves as for `DOWN`.
- `HALF_DOWN`: rounds towards "nearest neighbor" unless both neighbors are equidistant, in which case round down. Behaves as for `UP` if the discarded fraction is > 0.5; otherwise, behaves as for `DOWN`.
- `HALF_CEILING`: rounds towards "nearest neighbor" unless both neighbors are equidistant, in which case round towards positive infinity. If the result is positive, behaves as for `HALF_UP`; if negative, behaves as for `HALF_DOWN`.
- `HALF_FLOOR`: rounds towards "nearest neighbor" unless both neighbors are equidistant, in which case round towards negative infinity. If the result is positive, behaves as for `HALF_DOWN`; if negative, behaves as for `HALF_UP`.
- `HALF_EVEN`: rounds towards the "nearest neighbor" unless both neighbors are equidistant, in which case rounds towards the even neighbor. Behaves as for `HALF_UP` if the digit to the left of the discarded fraction is odd; behaves as for `HALF_DOWN` if it's even.
Rounding mode | Description
-------------- | -----------
`UNNECESSARY` | Assumes that no rounding is necessary, and throws an exception if it is.
`UP` | Rounds away from zero.
`DOWN` | Rounds towards zero.
`CEILING` | Rounds towards positive infinity. If the result is positive, behaves as for `UP`; if negative, behaves as for `DOWN`.
`FLOOR` | Rounds towards negative infinity. If the result is positive, behave as for `DOWN`; if negative, behave as for `UP`.
`HALF_UP` | Rounds towards "nearest neighbor" unless both neighbors are equidistant, in which case round up. Behaves as for `UP` if the discarded fraction is >= 0.5; otherwise, behaves as for `DOWN`.
`HALF_DOWN` | Rounds towards "nearest neighbor" unless both neighbors are equidistant, in which case round down. Behaves as for `UP` if the discarded fraction is > 0.5; otherwise, behaves as for `DOWN`.
`HALF_CEILING` | Rounds towards "nearest neighbor" unless both neighbors are equidistant, in which case round towards positive infinity. If the result is positive, behaves as for `HALF_UP`; if negative, behaves as for `HALF_DOWN`.
`HALF_FLOOR` | Rounds towards "nearest neighbor" unless both neighbors are equidistant, in which case round towards negative infinity. If the result is positive, behaves as for `HALF_DOWN`; if negative, behaves as for `HALF_UP`.
`HALF_EVEN` | Rounds towards the "nearest neighbor" unless both neighbors are equidistant, in which case rounds towards the even neighbor. Behaves as for `HALF_UP` if the digit to the left of the discarded fraction is odd; behaves as for `HALF_DOWN` if it's even.
### Serialization