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From: Arne Vajhøj on 13 Feb 2010 13:40
On 10-02-2010 13:35, Tom Anderson wrote:
> On Tue, 9 Feb 2010, Arne Vajh?j wrote:
>
>> On 09-02-2010 13:12, Tom Anderson wrote:
>>> On Mon, 8 Feb 2010, Arne Vajh?j wrote:
>>>
>>>> On 08-02-2010 02:09, luc peuvrier wrote:
>>>>> On 8 f?v, 04:23, Lew<no...(a)lewscanon.com> wrote:
>>>>>> Lew wrote:
>>>>>>> just between us, after 30 years of programming I have never handled
>>>>>>> monetary data: surprise, right?
>>>>>>
>>>>>>> I am really happy to learn than float is not proper.
>>>>>>
>>>>>> Think about the reasons why.
>>>>>
>>>>> Luc:
>>>>> float is an approximate numeric datatype, as defined by ANSI
>>>>> standards.
>>>>> http://stackoverflow.com/questions/285680/representing-monetary-values-in-java:
>>>>>
>>>>>
>>>>> "Martin Fowler recommends the implementation of a dedicated Money
>>>>> class to represent currency amounts, and that also implements rules
>>>>> for currency conversion."
>>>>
>>>> That is one option.
>>>>
>>>> java.math.BigDecimal may be good enough for many cases.
>>>
>>> Or int/long and establishing a convention that you're working in pence,
>>> or thousandths of a dollar, or whatever is suitable.
>>
>> Yes, but why bother when BigDecimal already handle it.
>
> Because you can say + to an int.

+ and - is a bit easier, but *, / and IO becomes
harder.

Arne
From: Andreas Leitgeb on 14 Feb 2010 17:46
Arne Vajhøj <arne(a)vajhoej.dk> wrote:
> On 10-02-2010 13:35, Tom Anderson wrote:
>> On Tue, 9 Feb 2010, Arne Vajh?j wrote:
>>> Yes, but why bother when BigDecimal already handle it.
>> Because you can say + to an int.
> + and - is a bit easier, but *, / and IO becomes
> harder.

Multipliation with a "scalar" value isn't harder, and I haven't
yet had a need to multiply currency-values with other currency-
values. £·€, €²,£³ ?-)

about IO: well, yes, you gotta apply the scaling first.

From: Arne Vajhøj on 14 Feb 2010 20:26
On 14-02-2010 17:46, Andreas Leitgeb wrote:
> Arne Vajhøj <arne(a)vajhoej.dk> wrote:
>> On 10-02-2010 13:35, Tom Anderson wrote:
>>> On Tue, 9 Feb 2010, Arne Vajh?j wrote:
>>>> Yes, but why bother when BigDecimal already handle it.
>>> Because you can say + to an int.
>> + and - is a bit easier, but *, / and IO becomes
>> harder.
>
> Multipliation with a "scalar" value isn't harder, and I haven't
> yet had a need to multiply currency-values with other currency-
> values. £·€, €²,£³ ?-)

That is not very likely.

But some may multiply with exchange rates or interest rates.

> about IO: well, yes, you gotta apply the scaling first.

Yep.

Arne

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