using System;

public class Program

{

    public static void Main()

    {

        var a1 = 0.1f;

        var a2 = 0.2f;

        var b1 = 0.10000001f;

        var b2 = 0.20000002f;

        var b3 = 0.30000003f;

​

        Console.WriteLine("float X1: " + (0.3f == a1 + a2));                

        Console.WriteLine("float X2: " + (b3 == b1 + b2));              

        Console.WriteLine("float Y: " + (0.3f == 0.1f + 0.2f));

        var d1 = 0.1d;

        var d2 = 0.2d;

        var d3 = 0.3d;

        var e1 = 0.1001d;

        var e2 = 0.2001d;

        var e3 = 0.3002d;

        Console.WriteLine("double X: " + (d3 == d1 + d2));      

        Console.WriteLine("double Y: " + (e3 == e1 + e2));

        Console.WriteLine("double Z: " + (0.3d == 0.1d + 0.2d));

        Console.WriteLine("decimal " + (0.3m == 0.1m + 0.2m));

        //

    }

}