Formatting Numbers in C# - C#

Mark Schweikert

http://www.programmers-corner.com

modusponens@toadmail.com

A few examples of formatting numbers using C#

using System;

class FormattingNumbers
{
  static void Main()
  {
    decimal theDecNumber = 12345.678m; //the "m" creates a literal of type decimal from a double
    //Using the ToString Method
    //the number in the format string is the precision specifier
    Console.WriteLine("No formatting: " + theDecNumber.ToString());
    Console.WriteLine("Currency formatting: " + theDecNumber.ToString("C"));
    Console.WriteLine("Exponential formatting: " + theDecNumber.ToString("E"));
    Console.WriteLine("Fixed-point formatting: " + theDecNumber.ToString("F2"));
    Console.WriteLine("General formatting: " + theDecNumber.ToString("G"));
    Console.WriteLine("Number formatting to 2 decimal places: " + theDecNumber.ToString("N2"));
    Console.WriteLine("Number formatting to 3 decimal places: " + theDecNumber.ToString("N3"));
    Console.WriteLine("Number formatting to 4 decimal places: " + theDecNumber.ToString("N4"));
    Console.WriteLine("Percent formatting: " + theDecNumber.ToString("P0"));

    int theIntNumber = 123456;
    Console.WriteLine("Hexidecimal formatting (for integers): {0} = {1}", theIntNumber, theIntNumber.ToString("X"));

    double theDblNumber = 1234567890;
    Console.WriteLine("Custom formatting: {0} to US telephone {1}", theDblNumber, theDblNumber.ToString( "(###) ### - ####" ));

    //Keep console open if not run through command prompt
    Console.Write("\nPress Enter to Continue");
    Console.ReadLine();
  }
}