473.22000000000025 instead of 473.22 ???

[Chris Tacke, eMVP]

That's simply how floats work on computers. Take a look at these:

http://www.lahey.com/float.htm
http://support.microsoft.com/default.aspx?scid=kb;EN-US;125056
http://docs.python.org/tut/node15.html

-Chris

 

[Ofer B.]

Hi all,

when I run this code:

string sNum1 = "5000"
string sNum2 = "4526.78";

double dNum = double.Parse(sNum1);
dNum = dNum - double.Parse(sNum2 );
===============================

dNum is equal 473.22000000000025 instead of 473.22.
Why does it hapened?

At the end of my calculation, I have to get zero but I get 0.00000000025

what can I do?

Thanks,
Ofer

 

[Jon Skeet [C# MVP]]

when I run this code:

string sNum1 = "5000"
string sNum2 = "4526.78";

double dNum = double.Parse(sNum1);
dNum = dNum - double.Parse(sNum2 );
===============================

dNum is equal 473.22000000000025 instead of 473.22.
Why does it hapened?

At the end of my calculation, I have to get zero but I get 0.00000000025

See http://www.pobox.com/~skeet/csharp/floatingpoint.html