实验目标:

(1)以二叉树的先序序列创建二叉树的二叉链表存储结构,先序序列包含空结点

(2)用递归算法实现前序遍历二叉树,输出遍历序列

(3)用递归算法实现中序遍历二叉树,输出遍历序列

(4)用递归算法实现后序遍历二叉树,输出遍历序列

(5)用非递归算法实现中序遍历二叉树,输出遍历序列

(6)求二叉树深度,返回深度值

(7)统计二叉树结点个数,返回二叉树结点个数

(8)查找二叉树结点,在根指针为 T 的二叉树中,查找值为 x 的结点, 查找成功, p 赋值为该结点指针,返回 true;查找失败, p==NULL ,返回 false


实验代码

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#include<bits/stdc++.h>
using namespace std;

#define TRUE 1
#define FALSE 0
#define OK 1
#define ERROR 0
#define INFEASIBLE -1
#define OVERFLOW -2

typedef char TElemType;

#define MAX_TREE_SIZE 100
typedef TElemType SqBiTree[MAX_TREE_SIZE];
SqBiTree bt;

typedef struct BiNode
{
TElemType data;
struct BiNode *lchild, *rchild;
}*BiTree,BiNode;

void CreateBiTree(BiTree &T)
{
char ch;
cout<<"请输入要插入的值:";
cin>>ch;
cout<<endl;
if(ch=='#') T=NULL;
else{
T=(BiTree)malloc(sizeof(BiNode));
if(T==NULL){
cout<<"分配存储空间失败!"<<endl;
return;
}
T->data=ch;
CreateBiTree(T->lchild);
CreateBiTree(T->rchild);
}
return;
}

void PreOrderTraverse (BiTree T)
{
if(T==NULL) return;
cout<<T->data<<" ";
PreOrderTraverse(T->lchild);
PreOrderTraverse(T->rchild);
}

void InOrderTraverse (BiTree T)
{
if(T==NULL) return;
InOrderTraverse(T->lchild);
cout<<T->data<<" ";
InOrderTraverse(T->rchild);
}

void PostOrderTraverse (BiTree T)
{
if(T==NULL) return;
PostOrderTraverse(T->lchild);
PostOrderTraverse(T->rchild);
cout<<T->data<<" ";
}

void InOrderTraverseNon (BiTree T)
{
BiTree stack[MAX_TREE_SIZE],Node;
int top=0;
if(T==NULL) return;

Node=T;

while (Node != NULL || top>0){
while(Node != NULL){
stack[++top]=Node;
Node=Node->lchild;
}

Node=stack[top--];
cout<<Node->data<<" ";
Node=Node->rchild;
}
}

int Depth(BiTree T)
{
if(T==NULL) return ERROR;

char maxLeft=Depth(T->lchild);
char maxRight=Depth(T->rchild);
if(maxLeft>maxRight) return (1+maxLeft);
else return (1+maxRight);
}

int Count(BiTree T)
{
if(T==NULL) return ERROR;

else return Count(T->lchild) + Count(T->rchild)+1;
}

bool Search(BiTree T, TElemType x, BiTree &p)
{
if(T==NULL) return ERROR;

if(T->data==x){
p=T;
return p;
}

if(Search(T->lchild,x,p)) return Search(T->lchild,x,p);
else return Search(T->rchild,x,p);
}

int main()
{
BiTree T;
while(1){
cout<<endl;
cout<<"**************************************************************************"<<endl;
cout<<"**1,创建二叉树,结束输入请输入“#” \t**"<<endl;
cout<<"**2,先序遍历 \t**"<<endl;
cout<<"**3,中序遍历 \t**"<<endl;
cout<<"**4,后序遍历 \t**"<<endl;
cout<<"**5,以非递归函数中序遍历 \t**"<<endl;
cout<<"**6,最大深度 \t**"<<endl;
cout<<"**7,节点数 \t**"<<endl;
cout<<"**8,查找值为x的结点 \t**"<<endl;
cout<<"**0,退出系统 \t**"<<endl;
cout<<"**************************************************************************"<<endl<<endl;

int choice;
cout<<"请输入要进行的操作:";
cin>>choice;
cout<<endl;

switch(choice){
case 1:{
CreateBiTree(T);
cout<<endl;
break;
}
case 2:PreOrderTraverse(T);cout<<endl;break;
case 3:InOrderTraverse(T);cout<<endl;break;
case 4:PostOrderTraverse(T);cout<<endl;break;
case 5:InOrderTraverseNon(T);cout<<endl;break;
case 6:cout<<Depth(T)<<endl;cout<<endl;break;
case 7:cout<<Count(T)<<endl;cout<<endl;break;
case 8:{
TElemType x;
cout<<"请输入要查找的值:";
cin>>x;
cout<<endl;
BiTree p;
Search(T,x,p);
cout<<"查找成功!"<<endl;
break;
}
case 0:exit(0);
}
}
return 0;
}