On Fri, Jul 25, 2003 at 04:21:36PM +0200, Jonas Maebe wrote: > > On vrijdag, jul 25, 2003, at 16:22 Europe/Brussels, James Mills wrote: > > >Why does the following result in a runtime error ? > > > >program example; > > > >const > > THE_PORT = 9999; > > > >function swapWord(w: Word): Word; > >begin > > swapWord := (w SHL 8) OR (w SHR 8); > >end; > > In Pascal, all calculations are performed using the base type (which is > 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 ? This bit of code was taken directly from server.pp in one of the old 2002 mailing threads... cheers James > > > Jonas > > > _______________________________________________ > fpc-pascal maillist - [EMAIL PROTECTED] > http://lists.freepascal.org/mailman/listinfo/fpc-pascal -- - -Zero Defect Software Engineers Group - ZDSEG - -You need only two tools. WD-40 and duct tape. -If it doesn't move and it should, use WD-40. -If it moves and shouldn't, use the tape. _______________________________________________ fpc-pascal maillist - [EMAIL PROTECTED] http://lists.freepascal.org/mailman/listinfo/fpc-pascal
