using System;
class Swapper
{
       public void Swap(ref double x, ref double y)

    {
        double temp = x; //copy x into temp
        x = y; //copy y into x
        y = temp; //copy temp into y (copy the original value of x into y)
    }
    static void Main()
    {
        Swapper switcher = new Swapper();
        var first = 10.5; var second = 10.6;
        Console.Write("first=" + first + "nsecond=" + second + "n"); // before swap
        switcher.Swap(ref first, ref second);
        Console.Write("first=" + first + "nsecond=" + second + "n"); // after swap

    }
}

class Swapper2
{
    public void Swap2(ref dynamic x2, ref dynamic y2)
    {
        dynamic temp2 = x2;
        x2 = y2;
        y2 = temp2;
    }

    static void Main2()
    {
        Swapper2 switcher2 = new Swapper2();
        dynamic first2 = 6549744554; dynamic second2 = 10.6M;
        Console.Write("first=" + first2 + "nsecond=" + second2 + "n");
        switcher2.Swap2(ref first2, ref second2);
        Console.Write("first=" + first2 + "nsecond=" + second2 + "n");

    }
}

using System;

class Swapper
{
    public void Swap(ref double x, ref double y)

    {
        double temp = x; //copy x into temp
        x = y; //copy y into x
        y = temp; //copy temp into y (copy the original value of x into y)
    }

    public void Swap2(ref dynamic x2, ref dynamic y2)

    {
        dynamic temp2 = x2;
        x2 = y2;
        y2 = temp2;
    }

    static void Main()
    {
        Swapper switcher = new Swapper();
        var first = 10.5; var second = 10.6;
        Console.Write("first=" + first + "nsecond=" + second + "n"); // before swap
        switcher.Swap(ref first, ref second);
        Console.Write("first=" + first + "nsecond=" + second + "n"); // after swap


        Swapper switcher2 = new Swapper();
        dynamic first2 = 6549744554; dynamic second2 = 10.6M;
        Console.Write("first=" + first2 + "nsecond=" + second2 + "n");
        switcher2.Swap2(ref first2, ref second2);
        Console.Write("first=" + first2 + "nsecond=" + second2 + "n");

    }
}