That is an interesting way to store money. We developed a fixed point
arithmetic library of arbitrary precision using the algorithms described
by Knuth in his semi-numerical algorithms volume and using standard
DECIMAL(n,m) definition. Rounding is precise using an algorithm which
does not drift and intermediate. Finally the numbers are stored in
display format, right justified and with leading spaces and signs so
that they can be displayed in HTML pages or printed output without
reformating.
The arithmetic is obviously not suited to intensive calculation but is
well suited to money usage where the absence of radix changes and edit
conversions more than compensates for the arithmetic overhead, helped by
using effcient arithmetic algorithms. Another advantage is that it
makes inserting numbers in report tables absolutely trivial. They
automatically line up in right justified columns.
It was a fairly simple exercise to graft this number system into Sqlite,
really only requiring that the regular behaviour of giving a DECIMAL
type numeric affiliation be altered to text affiliation to stop Sqlite
from translating the formatted, fixed point numbers to floating point.
RohitPatel9999 wrote:
While doing currency math, a useful money class at following link, may be
used as a a reference.
http://www.di-mare.com/adolfo/p/money.htm
Yet Another C++ Money Class (by Adolfo Di Mare), The C Users Journal, Vol.10
No.4, pp [58-64], April 1992
Rohit.
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