static void Main(string[] args)
{
Console.WriteLine("Hello World!");
Console.WriteLine();
Tree Oak = new Tree();
Oak.AddFirst(7);
Oak.Root.Left = new Node(2);
Oak.Root.Left.Left = new Node(4);
Oak.Root.Left.Right = new Node(5);
Oak.Root.Right = new Node(3);
Console.WriteLine("Inorder Traversal");
Oak.Inorder(Oak.ReturnRoot());
Console.WriteLine(" ");
Console.WriteLine();
Console.WriteLine("Preorder Traversal");
Oak.Preorder(Oak.ReturnRoot());
Console.WriteLine(" ");
Console.WriteLine();
Console.WriteLine("Postorder Traversal");
Oak.Postorder(Oak.ReturnRoot());
Console.WriteLine(" ");
Console.ReadLine();
}