Re: Losing precision when converting to double
Vince P <[email protected]> Mon, 30 Oct 2006 08:30:12 -0600
| Newsgroups | gmane.comp.windows.devel.dotnet.cx |
|---|---|
| Message-ID | <003401c6fc2f$e95397f0$bbfac7d0$@net> |
Did you read the Documentation for the Decimal structure? Quote: System.Decimal Conversions from Decimal to other types are narrowing conversions that round the Decimal value to the nearest integer value toward zero. If the result of the conversion is not representable in the destination type, an OverflowException is thrown. This type provides methods that convert Decimal values to and from Single and Double. Conversions from Decimal to Single or Double are narrowing conversions that might lose precision but not information about the magnitude of the converted value. The conversion will not throw an exception. -----Original Message----- From: Discussion relating to the specifics of the C# and Managed C++ languages [mailto:[email protected]] On Behalf Of Mikael Bergforsen Sent: Monday, October 30, 2006 6:47 AM To: [email protected] Subject: [DOTNET-CX] Losing precision when converting to double Whenever the result of an operation is a double I loose precision; here are some examples: double a = 1111.111111111; //a = 1111.1111111109999 OK converting from decimal double a = Convert.ToDouble(1111.111111111M); //a = 1111.111083984375 NOT OK result of addition double a = 1111.111111111; double b = 1111.111111111; double c = a + b; //c = 2222.22216796875 NOT OK double c = 2222.222222222; // c = 2222.2222222219998 OK Any idea why this happens? =================================== This list is hosted by DevelopMentorR http://www.develop.com View archives and manage your subscription(s) at http://discuss.develop.com =================================== This list is hosted by DevelopMentor® http://www.develop.com View archives and manage your subscription(s) at http://discuss.develop.com