schveiguy at gmail.com
Fri Jan 3 14:49:34 UTC 2020
On 1/1/20 4:06 PM, Steven Schveighoffer wrote:
> On 1/1/20 3:20 PM, Ola Fosheim Grøstad wrote:
>> On Wednesday, 1 January 2020 at 19:01:36 UTC, Steven Schveighoffer wrote:
>>> That is what I use. Fixed point with a factor of power of 10. In
>>> other words, a fixed point number with 2 decimal places would be
>>> sufficient for such currency. When doing math on such types, you just
>>> need to deal with the underlying numbers, and it works fine.
>> You don't need fixed point, just store cents in 64 bit floating point
>> and you get at least the same accuracy as a 53 bit integer fixed point.
> It is stored that way. Stored as a long. Just nicer to deal with
> printing and such. And instead of having to remember the factor, it's
> stored with the type.
oops, totally misread the floating point part, I thought you said 64 bit
It's not a *terrible* idea, but as you accumulate more errors, they will
add up. In money transactions, most of the time you have a fixed
resolution, and everything is rounded at every transaction. So floating
point is not necessary. I'd much rather do integer. I like the
exactness, and with something like checkedInt, you shouldn't have
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