Conting the number of decimals (variant of the Math.Round utility)?

Hot Topic

SqlDataSource Exception Handling
How to Determine size of the C# Object
File access from a Web Service
oleDbCommand Fill error
XslCompiledTransform - closes tags
Problems with events in .Net Remoting
Data trasfering tip required
Data access error
DirectoryInfo and System Volume Info
Continue a foreach loop after exception

.NET Development

Formatting DisplayMember string in a ComboBox
System.Transactions.Transaction promoting to DTC (illogically)? Why?
Server cannot access application directory.The directory does not exist or is not accessible
MS-RFID forum
XslCompiledTransform.Transform very slow
Fill an irregular shape with color in System.Drawing
Application updating itself
unknown exception - HELP!
How to get Physical path from a mapped drive in dot net
Calling a stored SQL Proceedure from VB

Conting the number of decimals (variant of the Math.Round utility)?

I would like to count the number of decimals (i.e. number of digits below the fractional comma/point) in a double value. I can think of many (dirty & not culture safe) ways of doing this, but I am looking for a reliable solution.

Does anyone has a solution to this problem

Thanks in advance,
Joannes

Answer this question

Conting the number of decimals (variant of the Math.Round utility)?

  • jazg

    I'm the development owner of Double. Since Double is internally base 2 rather than base 10, any attempt to count the decimals will be imprecise, so the techniques in the previous post are about your best option. However, this won't work reliabily for more than about 12 digits. If accuracy matter, I recommend using the Decimal type instead.

  • Danny Tsai

    Hi!

    You have at least two choices:

    1. format to string using current culture and count characters after separator (a little weird, but easy to implement and understand culture settings)

    2. do something like that pseudocode:

    double current = your_value - Math.Floor(your_value);

    int count = 0;

    while(current != 0)

    {

    count++;

    current *= 10;

    current = current - Math.Floor(current);

    }



  • Conting the number of decimals (variant of the Math.Round utility)?
Answer this question