Re: Change rounding mode

Wednesday, October 15, 2008, 1:04:00 PM, Attila Szegedi wrote:

> I should probably also note that the rounding policy only applies for
> operations on BigInteger and BigDecimal numbers, and then only for  
> division and for multiplication (when the scale of the multiplication
> product is higher than the value set by ArithmeticEngine.setMaxScale()).

This is irrelevant here AFAIS; the rounding discussed here happens
when you convert a number to a string.

-- 
Best regards,
 Daniel Dekany
 
> The default ArithmeticEngine is BigDecimal based, so all divisions and
> multiplications are subject to the rounding mode. Some people use a  
> ConservativeArithmeticEngine that operates on Java finite-precision  
> types and widens them without overflow as necessary (int->long- 
 >>BigInteger, float->double->BigDecimal etc.). If you use it, then  
> rounding mode will only kick in when the values used in arithmetic  
> operations can no longer fit in a long/double and become propagated to
> BigInteger/BigDecimal internally.
>
> Meaning, if you want to rigorously enforce the rounding mode, make  
> sure you stick with the default BigDecimalArithmeticEngine.
>
> Attila.
>
> On Oct 15, 2008, at 12:53 PM, Attila Szegedi wrote:
>
>> Sure:
>>
>> freemarker.template.Configuration myConfig = ...;
>> myConfig
>> .getArithmeticEngine().setRoundingMode(BigDecimal.ROUND_HALF_UP);
>>
>> Attila.
>>
>> On Oct 15, 2008, at 9:23 AM, David Cuenca wrote:
>>
>>> Hello,
>>>
>>> I would like to know if there is an easy way to change freemarker's
>>> default rounding mode. As the freemarker manual says:
>>>
>>> "Following the financial and statistics practice, the rounding goes
>>> according the so called half-even rule, which means rounding  
>>> towards the
>>> nearest ``neighbor'', unless both neighbors are equidistant, in which
>>> case, it rounds towards the even neighbor..."
>>>
>>> But I would like to use HALF_UP.
>>>
>>> Does anybody know if it's configurable?
>>>
>>> Thanks!
>
>
>
>
>
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