Floating point roundoff error

[Arne Vajhøj]

I have heard that if dealing with $, one should use 'cents'.
Or rather, use in int representation of cents, and only format
to dollars on output. Thoughts?

int is also used, but more work to do yourself. And rounding
can be tricky.

Oh - and always long - never int - 2 billion cents is just
20 million dollars.

Arne

 

[Arne Vajhøj]

Others say to keep a long of mils (if we're talking U.S. currency
units), giving one extra decimal digit of accuracy at the expense of one
in range.

But within the area more precision is not necessarily better.

Rounding rules is determined by business rules.

Arne