Re: About conversions

[Wilhelm.Spickermann@t-online.de (Wilhelm Spickermann)]

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On 23-Nov-00 Christoph Grein wrote:
> -14 mod 5:
> 
>  There's a common rule: ("Punkt vor Strich" in German) multiplication
> (* / mod 
> rem) before addition (+ -), thus this is
>  
>       -14 mod 5 = -2**2
> 
> You wouldn't fall into the latter trap, would you?
> 
> (Hope I'm correct, did not look it up in ARM :-)

Sorry, but "mod x" always delivers values between 0 and x (x excluded).
So the result is 1 and not -4.

I do like this rule of operation, because adding or subtracting a
multiple of the right operand to the left one will not change the
result of the operation. It would be nice to have a corresponding
division, such that A = (A / B) * B + A mod B. But the Ada definition of
integer division is different -- I don�t know why -- and so we need
"rem" instead of "mod" to make the above equation (and the one You have
given) true.

Wilhelm