创建二叉树和实现二叉树的三种遍历

根据提示输入字符型数据创建二叉树，输入值为所有字符型数据

输出为遍历后的每个结点的值的顺序

创建二叉树并能实现二叉树的先序、中序、后序遍历

-Create a binary tree and binary tree traversal three

Create a binary input is all character data prompted, enter the character data

The output value of each node traversal sequence after

Create a binary tree and binary tree can preorder, inorder, after preorder