文本为一个用c语言编写用于产生一个二叉树的源码文本。以三元组形式输入任意二叉树（以大写字母表示结点），求以任意一选定结点为子树的深度。如，在输入示范题中的二叉树之后，程序显示：Please select a node: 输入 ‘B’，回车后，程序显示‘3’。-Text for a written in c used to produce a binary tree source text. With three yuan group form input arbitrary binary tree (with a capital letter says node), asks to a selected node for any son the depth of the tree. If the input and demonstration of the question after the binary tree, the program shows: Please select a node: input "B", enter, the program shows　3 ".