Question double , number of decimal places

[andrews]

Is there a fast way to get a number of double type with n decimal places.

f.e. x = 0.254789457845128.......
I want x as 0.25478945 with 8 decimals

Thanks for any response

 

[jmcilhinney]

That's true, but what will you do if you want to truncate to other than 8 decimal places? Maybe you don't need flexibility but it's not a bad idea to provide it anyway. It's really a good idea to build up a reusable library of functions like this that you can reference in any project and not have to keep doing the same thing over and over.

 

[andrews]

Yes, you are right but my function TruncateNew is doing this.
And I have already a DLL library with 31 functions and 18 subs.
Regards

 

[andrews]

And a little faster

Public Function TruncateNew(ByVal source As Double, ByVal decimals As Integer) As Double
Dim i As Integer
Dim difference As Double
difference = 2
For i = 1 To decimals
difference = difference * 10
Next
difference = 1 / difference
Return Math.Round(source - difference, decimals)
End Function

time : 11.1 seconds