// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002331/double-log

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("  Evaluate this identity with selected values for X:");

        Console.WriteLine("                              ln(x) = 1 / log[X](B)");

        Console.WriteLine();

​

        double[] values = { 1.2, 4.9, 9.9, 0.1 };

​

        foreach (double value in values)

        {       

            // C# Extension Method: Double - Log

            Console.WriteLine("                      Log({0}) = {1:E16}", value, value.Log());

​

            // C# Extension Method: Double - Log

            double e = Math.E;

            Console.WriteLine("             1.0 / Log(e, {0}) = {1:E16}", value, 1.0 / e.Log(value));

            Console.WriteLine();

        }

    }

}