gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Blatt<T> : Blattbaum
    {
        T val { get; set; }
        public Blatt()
        {
        }
        public override bool isLeaf()
        {
            return true;
        }
        public override bool isNode()
        {
            return false;
        }
       
    }
    class Node : Blattbaum
    {
        public Node()
        {
        }

        public override bool isLeaf()
        {
            return true;
        }
        public override bool isNode()
        {
            return false;
        }
        public Blattbaum a{get; set;}
        public Blattbaum b{get; set;}

        public void show(Blattbaum a)
        {

        }
        
            
    }
    class Blattbaum
    {
        public virtual bool isLeaf()
        {
            return false;
        }
        public virtual bool isNode()
        {
            return false;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Blatt<int> b = new Blatt<int>();
            Blatt<int> c = new Blatt<int>();
            Node n = new Node();
            n.a = b;
            n.b = c;

        }
    }
}