That was an interesting link, thanks. I liked other parts of the site too, for instance

http://speleotrove.com/decimal/

Any idea what decimal floating point is used for?

(I have little to no idea about CAD or financial software.

I can see that fixed-point decimal with two decimal places is useful for things where you want to be able to reason about rounding of cents.

I can also see that you'd want more than two decimal places for a lot of calculations, for instance computing interest.

But decimal floating point...what's specified in such a way that you need to use decimal floating point?

I checked the wikipedia decimal floating point page. Didn't see any concrete examples there either.)