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.
Jonas
_______________________________________________ fpc-pascal maillist - [EMAIL PROTECTED] http://lists.freepascal.org/mailman/listinfo/fpc-pascal
