[Cfp-interest 2407] Re: x++ and DFP

[Mike Cowlishaw]

> C23 says in 6.5.2.4 Postfix increment and decrement operators 
> that "1" is added.  Joseph Myers has raised the question:
> Which quantum exponent does that "1" have?
> 
> For example, should it be 1e0 or 1000000e-6 for 7 digit DFP numbers?
> 
> My guess is:  the nearest quantum exponent of what 'x' has.

I think that could have some odd effects when 'x' has extreme exponents.

I would/do use 1e0 (that is, '1', as written, not '1.0', '1.00', etc.) and
calculate using the rules for addition or subtraction.

Mike