You can use the samples. BUT some of them are because of bug of Gambas, not the general problem with floating points! Example, Log2(536870912) = 29 is true with double precision floating points but not with Gambas. Also 8388608.0 is 8388608.0 in double precision floating point, but in Gambas *shows* 8388607,99999999.
If you use these all as samples you will give wrong information. Jussi On Fri, Dec 23, 2011 at 20:22, Randall Morgan <rmorga...@gmail.com> wrote: > Now you guys come up with samples of floating point rounding hehehehe.... > > A couple months ago I was looking for such rounding demos for my tutorials > I am writing. Note that this is just a part of programming. Many real > numbers do not have a direct representation in base 2 (binary). So to > represent those numbers the floating point library estimates the numbers. > The way to deal with this issue is to always define the precision needed > and use the most appropriate data type then limit the precision to > something less. This is a common issue with floating point math and why you > will find many specialized math libraries for science and engineering with > use much more precise methods to represent real numbers. > > Thanks for the demos I may use them in my tutorials if that's ok with you? > > Randall > > On Fri, Dec 23, 2011 at 10:10 AM, <gam...@googlecode.com> wrote: > > > > > Comment #6 on issue 165 by jussi.la...@gmail.com: Arithmetic problem > with > > float > > http://code.google.com/p/gambas/issues/detail?id=165 > > > > That is kind of expected result, > > since with doubles (float in Gambas) the actual value is (5.025 - 5): > > 0.0250000000000003552713678800500929355621337890625000 > > And Gambas rounds it to: > > 0.0250000000000004 > > > > See this for further details: > > http://en.wikipedia.org/wiki/Floating_point > > > > > > > > > ------------------------------------------------------------------------------ > > Write once. Port to many. > > Get the SDK and tools to simplify cross-platform app development. Create > > new or port existing apps to sell to consumers worldwide. Explore the > > Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join > > http://p.sf.net/sfu/intel-appdev > > _______________________________________________ > > Gambas-user mailing list > > Gambas-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/gambas-user > > > > > > -- > If you ask me if it can be done. The answer is YES, it can always be done. > The correct questions however are... What will it cost, and how long will > it take? > > ------------------------------------------------------------------------------ > Write once. Port to many. > Get the SDK and tools to simplify cross-platform app development. Create > new or port existing apps to sell to consumers worldwide. Explore the > Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join > http://p.sf.net/sfu/intel-appdev > _______________________________________________ > Gambas-user mailing list > Gambas-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/gambas-user > ------------------------------------------------------------------------------ Write once. Port to many. Get the SDK and tools to simplify cross-platform app development. Create new or port existing apps to sell to consumers worldwide. Explore the Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join http://p.sf.net/sfu/intel-appdev _______________________________________________ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
