二叉树遍历 前序遍历 后序遍历 中序遍历 非递归前序遍历 二叉树遍历非递归

#include<iostream>
using namespace std;

/**
二叉树的遍历：前序，后序，中序
二叉树的非递归遍历：前序，后序，中序
参考文献：http://topic.csdn.net/t/20060802/17/4922659.html
***/
typedef struct BiTNode
{
char data;
struct BiTNode  *lchild,*rchild;

}BiTNode,*BiTree;


int CreateBiTree(BiTree &T)
{
char ch;

cin.get(ch);
if(ch == ' ')
T = NULL;
else
{
if(!(T = (BiTNode*)malloc(sizeof(BiTNode))))
exit(0);
T->data = ch;
CreateBiTree(T->lchild);
CreateBiTree(T->rchild);
}
return 1;

}


int PreOrderVisit(BiTree &T)
{
if(T)
{
cout<<T->data<<endl;
PreOrderVisit(T->lchild);
PreOrderVisit(T->rchild);
return 1;
}else
return  1;

}


int MidOrderVisit(BiTree &T)
{
if(T)
{
MidOrderVisit(T->lchild);
    cout<<T->data;
MidOrderVisit(T->rchild);
return 1;

}
else
return 1;
}



int LastOrderVisit(BiTree &T)
{
if(T)
{
LastOrderVisit(T->lchild);
LastOrderVisit(T->rchild);
cout<<T->data;
}
else
return 1;
}




//先序遍历二叉树：非递归
int PreOrderVisit2(BiTree &T)
{
BiTree temp = T;
cout<<"非递归前序遍历树:"<<endl;
BiTree stack[100] ;
int top = -1;
while(T||top>-1)
{
while(T)
{
cout<<T->data<<" ";
stack[++top] = T;
T = T->lchild;
}
if(top>-1)
{
T = stack[top--];
T = T->rchild;
}
}
T = temp;
cout<<endl;
return 1;
}

//中序遍历二叉树：非递归
int MidOrderVisit2(BiTree &T)
{
BiTree temp = T;
cout<<"非递归中序遍历树:"<<endl;
BiTree stack[100] ;
int top = -1;
while(T||top>-1)
{
while(T)
{

stack[++top] = T;
T = T->lchild;
}

if(top>-1)
{
T = stack[top--];
cout<<T->data<<" ";
T = T->rchild;
}
}
cout<<endl;
T = temp;
return 1;
}

//后序遍历二叉树：非递归
int LastOrderVisit2(BiTree &T)
{
BiTree temp = T;
cout<<"非递归后序遍历树:"<<endl;
BiTree stack[100] ;
int tag[100];
int top = -1;
while(T||top>-1)
{
while(T)
{ 
int pointer = ++top;
stack[pointer] = T;
tag[pointer] = 0;
T = T->lchild;
}

while(top>-1&&tag[top]==1)
{
T = stack[top--];
cout<<T->data<<" ";
}

if(top>-1)
{
tag[top] = 1;
T = stack[top];
T = T->rchild;
}else
break;
}
cout<<endl;
T = temp;
return 1;
}


int main()
{

  BiTree T;
  //例如:
  // abc空格空格de空格g空格空格f空格空格空格
  cout<<"创建树：输入数据，Enter键结束："<<endl;
  CreateBiTree(T);
/* cout<<"前序遍历树:"<<endl;
  PreOrderVisit(T);
  cout<<"中序遍历树:"<<endl;
  MidOrderVisit(T);
  cout<<"后序遍历树:"<<endl;
  LastOrderVisit(T);*/


  PreOrderVisit2(T);
  MidOrderVisit2(T);
  LastOrderVisit2(T);

}