[fpc-pascal]runtime 201 with swapword function
prologic at daisy.ods.org
Fri Jul 25 16:40:41 CEST 2003
On Fri, Jul 25, 2003 at 04:30:24PM +0200, Jonas Maebe wrote:
> On vrijdag, jul 25, 2003, at 16:32 Europe/Brussels, James Mills wrote:
> >>In Pascal, all calculations are performed using the base type (which
> >>longint in FPC), so if w > 255, then w shl 8 > high(word) and will
> >>result in a range check error when assigning to swapWord. Even if we
> >>calculated everything using words, you'd still get an overflow error,
> >>this time when doing the shl.
> >How can I correct this ?
> Use a typecast:
> function swapWord(w: Word): Word;
> swapWord := Word((w SHL 8) OR (w SHR 8));
Excellent thank you :)
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