Csharp/C Sharp/Class Interface/params

Using variable-length argument lists.

using System;
public class VarargsTest
{
   public static double Average( params double[] numbers )
   {
      double total = 0.0; // initialize total
      foreach ( double d in numbers )
         total += d;
      return total / numbers.Length;
   } 
   public static void Main( string[] args )
   {
      double d1 = 10.0;
      double d2 = 20.0;
      double d3 = 30.0;
      double d4 = 40.0;
      Console.WriteLine("d1 = {0:F1}\nd2 = {1:F1}\nd3 = {2:F1}\nd4 = {3:F1}\n",d1, d2, d3, d4 );
      Console.WriteLine( "Average of d1 and d2 is {0:F1}",Average( d1, d2 ) );
      Console.WriteLine( "Average of d1, d2 and d3 is {0:F1}",Average( d1, d2, d3 ) );
      Console.WriteLine( "Average of d1, d2, d3 and d4 is {0:F1}",Average( d1, d2, d3, d4 ) );
   }
}