using System;

​

public class My

{

    public int x;

    public My(int v)

    {

        x = v;

    }

}

​

public class ShowClass

{

    static public void Show(My o)

    {

        Console.Write(o.x + " ");

    }

    static public void Neg(My o)

    {

        o.x = -o.x;

    }

}

​

​

public class Program

{

    public static void Main()

    {

        My[] arr = new My[3];

        arr[0] = new My(1);

        arr[1] = new My(2);

        arr[2] = new My(3);

        Console.Write("mass = ");

        Array.ForEach(arr,ShowClass.Show);

        Console.Write("\nmass(neg) = ");

        Array.ForEach(arr,ShowClass.Neg);

        Array.ForEach(arr,ShowClass.Show);

    }

}