OOT: Negative number multiplication

[Alan McKinnon]

On Wednesday 24 May 2006 05:03, Groundhog wrote:
> dear friends,
>
> few weeks ago I had a question, acctually really simple question,
> but until today nobody can give me answer. okay here is my
> question:
>
> "as we know since Elementary School:
> (+) x (+) = (+)
> (+) x (-) = (-)
> (-) x (+) = (-)
> (-) x (-) = (+)
>
> now when I change with numbers:
> 5 x 3 = 5 + 5 + 5 = 15 (everybody know this very well)
> 5 x (-3) = ....................... = -15 (everybody getting
> confused) (-5) x (3) = (-5) + (-5) + (-5) = -15 (no problem with
> it) (-5) x (-3) = ....................... = 15 (then, everybody get
> frustated)
>
> could someone give answer about this 'elementary' question??

What's the problem? Your examples follow the rules you quoted exactly.

-- 
If only me, you and dead people understand hex, 
how many people understand hex?

Alan McKinnon
alan at linuxholdings dot co dot za
+27 82, double three seven, one nine three five