Ross, To call that result "pure luck" denies the fact that digital computers, when properly functioning, are 100% deterministic.
Of course, it's not proper floating-point programming, but that doesn't mean "luck" is involved. Randall Schulz Mountain View, CA USA At 18:04 2002-03-03, Ross Smith wrote: > > From: Chuck Allison [mailto:[EMAIL PROTECTED]] > > > > I have a simple Rational number class and have discovered > > weird behavior > > with Cygwin's g++. If you look at the very short main program in file > > rtest2.cpp, you will see by the output that g++ get's the > > wrong answer for > > > > r1 / r2 == Rational(2,3); // should be true > > > > even though it prints as 2/3! Borland and Microsoft get it > > right. Any ideas? > > All code atached. > >[relevant bit of code] > >inline bool operator==(const Rational& r1, const Rational& r2) >{ > return r1.toDouble() == r2.toDouble(); >} > >This is nothing to do with Cygwin, or g++ for that matter. You're >comparing floating point numbers. Of course it's not reliable! If other >compilers happened to give you an exact equality on that particular >combination of arguments, it was pure luck. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
