On Tuesday 30 October 2007 17:31, Inga Petuhhov wrote: > A copy-paste from Python Shell: > >>> a = 1 > >>> a > > 1 > > >>> a = a + 0.4 > >>> a > > 1.3999999999999999 > > >>> a = a - 0.4 > >>> a > > 0.99999999999999989 > > >>> a == 1 > > False
Or a bit more simple (and for some maybe even more surprising): >>> 1.0 == 0.4 - 0.4 + 1.0 True >>> 1.0 == 1.0 + 0.4 - 0.4 False Floating points are not "real"s. Even simple commutative laws don't hold. Vinzent. _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
