On 2018-12-17 9:16 AM, James K. Lowden wrote:
On Sat, 15 Dec 2018 01:24:18 -0800
Darren Duncan wrote:
If yours is a financial application then you should be using exact
numeric types only
Color me skeptical. That very much depends on the application. IEEE
double-precision floating point is accurate to within 15 decimal
digits. The example given,
211496.26
gives, safely, a margin of 6 order of magnitude. If the application is
taking sums of 100's of thousands of dollars, it will stay accurate to
within a penny using floating point until there are millions of
entries:
10^15 รท 10^8 = 10^7
I doubt the financial application exists that sums milliions of entries
AND cares about the last penny.
In modern days, getting to millions of financial transaction entries in a short
time is common, and we still care about the last penny, I know from experience.
-- Darren Duncan
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