public static void Main()
{
var tree =
new Tree <int>(7,
new Tree <int>(19,
new Tree <int>(1),
new Tree <int>(12),
new Tree <int>(31)),
new Tree <int>(21),
new Tree <int>(14,
new Tree <int>(23),
new Tree <int>(6)));
Console.WriteLine("Tree (indented):");
tree.Print();
Console.WriteLine(string.Join(' ', tree.OrderDFS()));
Console.WriteLine(string.Join(' ', tree.OrderBFS()));
Console.Write("Tree nodes:");
tree.Each(c => Console.Write(" " + c));
Console.WriteLine();
Console.WriteLine();
var binaryTree =
new BinaryTree <string>("*",
new BinaryTree <string>("+",
new BinaryTree <string>("3"),
new BinaryTree <string>("2")),
new BinaryTree <string>("-",
new BinaryTree <string>("9"),
new BinaryTree <string>("6")));
Console.WriteLine("Binary tree (indented, pre-order):");
binaryTree.PrintIndentedPreOrder();
Console.Write("Binary tree nodes (in-order):");
binaryTree.EachInOrder(c => Console.Write(" " + c));
Console.WriteLine();
Console.Write("Binary tree nodes (post-order):");
binaryTree.EachPostOrder(c => Console.Write(" " + c));
Console.WriteLine();
}