// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002317/double-isnan

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("It returns a value indicating whether a value is not-a-number.\n");

​

        Display(32.0, 12);

        Display(32.0, 0.0);

        Display(-5, 0.0);

        Display(0.0, 0.0);

    }

    public static void Display(double d1, double d2)

    {

        // C# Extension Method: Double - IsNaN

        bool result = (d1 / d2).IsNaN();

​

        Console.WriteLine("{0}/{1} = {2}", d1, d2, result);

    }

}