二叉树的构造与遍历

 1 #include <iostream>
 2 using namespace std;
 3 
 4 typedef struct node
 5 {
 6     char data;
 7     struct node *lchild;
 8     struct node *rchild;
 9 }BiTreeNode,*BiTree;
10 
11 void createBiTree(BiTree &T)
12 {
13     char c;
14     cin>>c;
15     if(c=='#') T=NULL;
16     else{
17         T=new BiTreeNode;
18         T->data=c;
19         createBiTree(T->lchild);
20         createBiTree(T->rchild);
21     }
22 }
23 
24 void preTraverse(BiTree T)
25 {
26     if(T){
27         cout<<T->data<<" ";
28         preTraverse(T->lchild);
29         preTraverse(T->rchild);
30     }
31 }
32 
33 void midTraverse(BiTree T)
34 {
35     if(T){
36         midTraverse(T->lchild);
37         cout<<T->data<<" ";
38         midTraverse(T->rchild);
39     }
40 }
41 
42 void postTraverse(BiTree T)
43 {
44     if(T){
45         postTraverse(T->lchild);
46         postTraverse(T->rchild);
47         cout<<T->data<<" ";
48     }
49 }
50 
51 int main()
52 {
53     BiTree T;
54     createBiTree(T);
55     cout<<"二叉树构造成功！"<<endl;
56     cout<<"先序遍历二叉树："<<endl;
57     preTraverse(T);
58     cout<<endl;
59     cout<<"中序遍历二叉树："<<endl;
60     midTraverse(T);
61     cout<<endl;
62     cout<<"后序遍历二叉树："<<endl;
63     postTraverse(T);
64     return 0;
65 }