1 #include <iostream>
 2 using namespace std;
 3 typedef struct node
 4 {
 5     struct node *left, *right;
 6     char data;
 7 
 8 }BiTreeNode,*BiTree;
 9 void createBiTree(BiTree &T)
10 {
11     char c;
12     cin >> c;
13     if ('#'==c)
14     {
15      T = NULL;
16     }
17     else
18     {
19         T = new BiTreeNode;
20         T->data = c;
21         createBiTree(T->left);
22         createBiTree(T->right);
23     }
24 }
25 void preTraverse(BiTree T)
26 {
27     if (T)
28     {
29         cout << T->data << " ";
30         preTraverse(T->left);
31         preTraverse(T->right);
32     }
33 }
34 void midTraverse(BiTree T)
35 {
36     if (T)
37     {
38         midTraverse(T->left);
39         cout << T->data << " ";
40         midTraverse(T->right);
41     }
42 }
43 void postTraverse(BiTree T)
44 {
45     if (T)
46     {
47         postTraverse(T->left);
48         postTraverse(T->right);
49         cout << T->data << " ";
50     }
51 }
52 int main()
53 {
54     BiTree T;
55     cout << "按照前序顺序建立二叉树" << endl;
56     createBiTree(T);
57     cout << "二叉树创建完成" << endl;
58     cout << "前序遍历输出" << endl;
59     preTraverse(T);
60     cout << endl;
61     cout << "中序遍历输出" << endl;
62     midTraverse(T);
63     cout << endl;
64     cout << "后序遍历输出" << endl;
65     postTraverse(T);
66     cout << endl;
67 }