二叉树的遍历算法

1、实验三 二叉树遍历算法一、 实验目的1 进一步理解掌握二叉树二叉链表存储结构。2 掌握二叉树遍历的递归与非递归算法。二、 实验要求1 认真阅读和掌握（先序、中序、后序和层次）遍历的递归与非递归算法。2 上机调试（先序、中序、后序和层次）遍历的递归与非递归算法。3 保存和打印出程序的运行结果，并结合程序进行分析。4 上机后，认真整理源程序及其注释，完成实验报告（包括源程序、实验结果、算法分析、心得体会等）。三、 实验内容先序、中序、后序遍历的递归与非递归算法和层次遍历的算法实现程序：#include "stdio.h"#include "stdlib.h"

2、#include "conio.h"#define maxsize 100typedef int datatype;typedef struct bnodedatatype data;struct bnode *lchild,*rchild;bnode,*btree;typedef struct bnode *node;int flag;DataType;typedef structDataType datamaxsize;int top;SeqStack,*PSeqStack;typedef struct btree datamaxsize;int front,rear;

3、SeqQueue,*PSeqQueue;typedef structbtree datamaxsize;int top;SeqStack1,*PSeqStack1;/建立一个二叉树btree create()btree t;char ch;scanf("%c",&ch);if(ch='?')t=NULL;elset=(btree)malloc(sizeof(bnode);t->data=ch;t->lchild=create();t->rchild=create();return t;/先序遍历/入栈操作void push1(PSe

4、qStack1 s,btree sq)if(s->top=maxsize-1)printf("栈满不得入栈");elses->top+;s->datas->top=sq;/出栈操作void pop1(PSeqStack1 s,btree *sq)if(s->top=-1)printf("栈空不得出栈");else*sq=s->datas->top;s->top-;/先序遍历的递归算法void PreOrder1(btree t)if(t)printf("%c",t->data);P

5、reOrder1(t->lchild);PreOrder1(t->rchild);/先序遍历的非递归算法void PreOrder2(btree t)PSeqStack1 s;s=(PSeqStack1)malloc(sizeof(SeqStack1);btree p=t;s->top=-1;while(p|s->top!=-1)if(p)printf("%c",p->data);push1(s,p);p=p->lchild;elsepop1(s,&p);p=p->rchild;/中序遍历的递归算法void InOrder1

6、(btree t)if(t)InOrder1(t->lchild);printf("%c",t->data);InOrder1(t->rchild);/中序遍历的非递归算法void InOrder2(btree t)PSeqStack1 s;s=(PSeqStack1)malloc(sizeof(SeqStack1);btree p=t;s->top=-1;while(p|s->top!=-1)if(p)push1(s,p);p=p->lchild;elsepop1(s,&p);printf("%c",p-&g

7、t;data);p=p->rchild;/后序遍历的递归算法void PostOrder1(btree t)if(t)/t=(btree)malloc(sizeof(bnode);PostOrder1(t->lchild);PostOrder1(t->rchild);printf("%c",t->data);/后序遍历的非递归算法/入栈操作void push(PSeqStack s,DataType sq)if(s->top=maxsize-1)printf("栈满不得入栈");elses->top+;s->da

8、tas->top=sq;/出栈操作void pop(PSeqStack s,DataType *sq)if(s->top=-1)printf("栈空不得出栈");else*sq=s->datas->top;s->top-;/后序遍历的非递归算法void PostOrder2(btree t)PSeqStack s;DataType sq;btree p=t;s=(PSeqStack)malloc(sizeof(SeqStack);s->top=-1;while(p|s->top!=-1)if(p)/s=(PSeqStack)mall

9、oc(sizeof(SeqStack);sq.flag=0;sq.node=p;push(s,sq);p=p->lchild;elsepop(s,&sq);p=sq.node;if(sq.flag=0)sq.flag=1;push(s,sq);p=p->rchild;elseprintf("%c",p->data);p=NULL;/按照层次遍历二叉树/队列的初始化PSeqQueue init()PSeqQueue q;q=(PSeqQueue)malloc(sizeof(SeqQueue);if(q)q->front=0;q->rear

10、=0;return q;/判断队空int empty(PSeqQueue q)if(q&&q->front=q->rear)return 1;else return 0;/入队void input(PSeqQueue q,btree x)if(q->rear+1)%maxsize=q->front)printf("队满");elseq->rear=(q->rear+1)%maxsize;q->dataq->rear=x;/出队void output(PSeqQueue q,btree *x)if(empty(q

11、)printf("队空");elseq->front=(q->front+1)%maxsize;*x=q->dataq->front;/按照层次遍历二叉树void LevelOrder1(btree t)PSeqQueue q;btree p=t;q=init();input(q,p);while(!empty(q)output(q,&p);printf("%c",p->data);if(p->lchild)input(q,p->lchild);if(p->rchild)input(q,p->

12、rchild);void main()btree t;t=create();printf("此二叉树的先序递归遍历输出为：");PreOrder1(t);printf("n");printf("此二叉树的先序非递归遍历输出为：");PreOrder2(t);printf("n");printf("此二叉树的中序递归遍历输出为：");InOrder1(t);printf("n");printf("此二叉树的中序递归遍历输出为：");InOrder2(t);printf("n");printf("此二叉树的后序递归遍历输出为：");PostOrder1(t);printf("n");printf("此二叉树的后序递归遍历输出为：&