一个很好的二叉树的程序，可以在vc++6.0环境下执行，可以创建，先序，中序，后序遍历，还可以输出树的叶子节点，按树状打印该二叉树-A good binary tree program, you can run under vc++6.0, you can create, the first order, in order, after traversing, you can output the tree leaf node, print the binary tree by tree