Console.Write - rounds.!!!

[Piotrekk]

Hi
I have a numerical problem.
Iam calculating vector is that is 0.xxxxxxxxxxx
and the calculating error for this vector. After that i correct first
vector.
The vectors differ on ~8 place after floating point. Debugger sees the
difference, but when i use Write method, i cant, because its rounding
my vectors.
Anyone can help?
PK

 

[Guest]

Instead of using Console.Write(float), which gives you the default format,
you can use Console.Write(float.ToString()), which allows you to specify your
own format for the output. For example:

float fValue = ...;
Console.Write(fValue.ToString("R"))

This would output all digits of the floating point number with no rounding.

Hope this helps.

Brian.

 

[Piotrekk]

Thank you

 

[Jon Skeet [C# MVP]]

Instead of using Console.Write(float), which gives you the default format,
you can use Console.Write(float.ToString()), which allows you to specify your
own format for the output. For example:

float fValue = ...;
Console.Write(fValue.ToString("R"))

This would output all digits of the floating point number with no rounding.

No, that doesn't output all the digits. It outputs enough to be able to
get back to that exact floating point number when parsing, which isn't
the same thing.

If you want to get the *exact* value of a floating point number, see
http://www.pobox.com/~skeet/csharp/DoubleConverter.cs