Re: boolean operators

[David Jones <drj@...>]

On 21 Sep 2006, at 23:40, Doug Currie wrote:

> Thursday, September 21, 2006, 6:01:12 PM, David Jones wrote:
>
> > Funny how no-one ever wants round-away-from 0, could be called
> > "inflate" perhaps?
>
> I just happen to be working on my decNumber documentation...
>
> decNumber.ROUND_CEILING     round towards +infinity
> decNumber.ROUND_UP          round away from 0
> decNumber.ROUND_HALF_UP     0.5 rounds up
> decNumber.ROUND_HALF_EVEN   0.5 rounds to nearest even
> decNumber.ROUND_HALF_DOWN   0.5 rounds down
> decNumber.ROUND_DOWN        round towards 0 (truncate)
> decNumber.ROUND_FLOOR       round towards -infinity

That's not your decNumber documentation, it's Java's  
java.math.BigDecimal documentation. :)

I can't believe they (whoever created java.math.BigDecimal) called  
"truncate" "Round Down".  I would naively expect Round Down to be the  
same as floor.  I can't believe you copied them.  Does your number  
line look like a V with 0 at the bottom centre?

It seems that ISO C 1999 (borrowed from IEC 60559) agree more with  
me.  ISO C has FE_DOWNWARD and FE_TOWARDZERO and as far as I can tell  
they're different.

Cheers,
 drj