Method printAsTree

java/Chapter 17/Question17_13/QuestionB.java:64–72

(BiNode root, String spaces)

	}

	public static void printAsTree(BiNode root, String spaces) {
		if (root == null) {
			System.out.println(spaces + "- null");
			return;
		}
		System.out.println(spaces + "- " + root.data);
		printAsTree(root.node1, spaces + "   ");
		printAsTree(root.node2, spaces + "   ");
	}

	public static void main(String[] args) {
		BiNode root = createTree();