On Mon, Mar 1, 2010 at 6:32 PM, ik <ido...@gmail.com> wrote: > > http://ik.homelinux.org/ > > > On Mon, Mar 1, 2010 at 23:20, Jerry <lancebo...@qwest.net> wrote: >> >> Don't compare floating points. Ever. Now you see why. > > So if I need for example to compare currency or something that is floating > point, how do I do that ? >
Let me my 2cent obvious comments too: 1) Just in case you don't know, Curreny is ok in the sense that it's exact - ok, FP is exact in it's own way ;) -, but keep in mind that its precision is just 4 decimal places, so you must be aware of precision loss too. 2) You can determine what is "close enough" for your comparison and use Abs(A - B) < MarginOfError (and of course variants of that code). I vaguely remember some performance problem with Abs (in Delphi or in general? does FP have a signal bit?), so let someone expert chime in to say whether you should Abs or two comparisons intead ;-) Best regards, Flávio _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
