树的程序包，我是个初学者，源码是从某书配套光盘中拷贝出来的，希望站长给个学习的机会，让我成为归站的会员，谢谢站长-Tree package, I was a beginner , source code is copied from a book supporting the CD out, I hope to give owners a chance to learn , so I became a member owned stations , thank webmaster