Dear All, Thanks a lot for your contributions.
Now I get cleared. I have read the articles given by you peoples & few more regarding the float properties & how it is storing, retriving in the system, number system controversies... Some important basic things to consider while we use float. Float value is influenced by the followings. 1) Precision 2) Accuracy 3) Rounded-off 4) Rounded-off error 5) Infinites & Nan. Please go through the following link which is very easy to understand the internal mechanism. http://www.developerfusion.co.uk/show/4691/1/ And more over, I found that the issue is due to attempt to handle the infinites & NaN which reflects in Finite numbers too... Many Thanks Friends:) With Best Regards, Velsankar On Sep 7, 5:09 pm, Jonathan <[EMAIL PROTECTED]> wrote: > It is a memory problem, but it has nothing to do with memory being > bad. It has to do with how the numbers are represented in a relatively > small amount of memory. Wikipedia has an excellent article on the > topic:http://en.wikipedia.org/wiki/IEEE_754. Read that, and try to > answer Mr. Lopez's question "How would the computer increment by a > 10th? How is it represented in binary?" and you'll see the problem. > You can also google IEEE 754 for even more info. > > (Answer: You can't represent 0.1 in a floating number, you can only > get close.) > > On Sep 6, 12:17 pm, "Charles A. Lopez" <[EMAIL PROTECTED]> > wrote: > > > Here are my thoughts > > > Before and after the decimal point a number is stored in the computer as > > binary. > > > Before the decimal we have > > > 2^0 = 1 > > 2^1 = 2 > > 2^2 = 4 > > 2^3 = 8 > > 2^4 = 16 > > 2^5 = 32 > > 2^6 = 64 > > 2^7 = 128 > > > After the decimal we have > > > 2^-1 = 1/2 = .5 > > 2^-2 = 1/4 = .25 > > 2^-3 = 1/8 = .125 > > 2^-4 = 1/16 = .0625 > > 2^-5 = 1/32 = .03125 > > 2^-6 = 1/64 = 0.015625 > > 2^-7 = 1/128 = 0.0078125 > > > How would the computer increment by a 10th? How is it represented in binary? > > > On Fri, Sep 5, 2008 at 1:17 AM, velsankar <[EMAIL PROTECTED]> wrote: > > > > A very basic problem, every one used to come across on our learning > > > times itself (mostly overlooked & the result oriented attitude rather > > > than why it is happening), still we have solution to avoid these.But > > > anyone know why it is happening???? The problem is the following code > > > only: > > > > for (floati = 10; i <= 11; i =i+ 0.1f) > > > Console.WriteLine(i); > > > > We will get answer as 10,10.0,....,10.9 > > > > Look @ the condition: it's <= & not <. Obviously, 11.0 should come. > > > Why it is not coming? > > > > When I asked my profs on my college days(even seniors, expd's), they > > > advised to use double. Of course, its a solution to get 11.0. But what > > > happened tofloat? Is thefloatnot precise???? For some days(truly in > > > years), I believed it might be memory issue. Because when we see the > > > entire 32 bytes of the incrementfloatvalue, it is not increasing > > > 0.10000000000.... but 0.10000010000 (The value is not constant, It can > > > be in any one of the 256 bits). Recently I tested with fresh(means the > > > first application to run after installed the windows embedded xp os) > > > thin client. Shocked!!!! The end result is same:( > > > > Is it Really a memory problem? If so, how can we identify better than > > > test as first application after os installed. Or the way I looking the > > > problem???. And more it is not the language issue. Its starts with c > > > only. Tested with c++, java also. I want to know the reason. Please > > > don't suggest to use double, if so why it is happening withfloat& > > > not with double??? > > > > Think, its not looks like advanced level programming, But the issue @ > > > core, fundamentals, how far we are understanding our process. Hope I > > > will get the genuine cause. > > > -- > > Charles A. Lopez > > [EMAIL PROTECTED] --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "DotNetDevelopment, VB.NET, C# .NET, ADO.NET, ASP.NET, XML, XML Web Services,.NET Remoting" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://cm.megasolutions.net/forums/default.aspx -~----------~----~----~----~------~----~------~--~---
