//線索二叉樹結(jié)點(diǎn)類型存儲結(jié)構(gòu)體TBSTree1.h
template<class T> class TBSTree;
template<class T> struct THNode
{public:
  int lflag,rflag;//標(biāo)志域
  THNode<T> *left;//第一個(gè)孩子結(jié)點(diǎn)指針域
  THNode<T> *right;//下一個(gè)兄弟結(jié)點(diǎn)指針域
  T data;//數(shù)據(jù)域
  friend class TBSTree<T>;//線索二叉樹類為友元
//構(gòu)造函數(shù)
  THNode():left(NULL),right(NULL),lflag(0),rflag(0){ }
  THNode(int la,int ra,T value,THNode<T> *fc=NULL,
   THNode<T> *ns=NULL):data(value),left(fc),
    right(ns){lflag=la;rflag=ra;}
//訪問指針域的成員函數(shù)
  THNode<T>* &FirstChild()
   {return left;}
  THNode<T>* &NextSibling()
   {return right;}
};
//線索二叉樹類
template<class T> class TBSTree
{public:
  //由結(jié)點(diǎn)構(gòu)造線索二叉樹
  THNode<T> *GetTreeNode(T item,THNode<T> *le=NULL,
    THNode<T> *ri=NULL,int lf=0,int rf=0);
  //創(chuàng)建特定線索二叉樹
  THNode<T> *MakeCharT(THNode<T> *&,int);
  //構(gòu)造二叉鏈表表示的二叉樹(按先序次序輸入結(jié)點(diǎn)值)
  void CreateBiTree(THNode<T> *&tr);
  //先序線索化二叉樹
  void InThread1(THNode<T> *&);
  //中序線索化二叉樹
  void InThread(THNode<T> *&);
  //后序線索化二叉樹
  void InThread2(THNode<T> *&);
  //中序正向遍歷線索二叉樹
  void ThInorder(THNode<T> *&);
};
template<class T>
THNode<T> *TBSTree<T>::GetTreeNode(T item,THNode<T> *le,
   THNode<T> *ri,int lf,int rf)
{THNode<T> *p=new THNode<T>;
 p->data=item;p->left=le;p->right=ri;
 p->lflag=lf;p->rflag=rf;
 if(p==NULL)
  {cerr<<"內(nèi)存分配失敗!\n";exit(1);}
 return p;
}
template<class T>
THNode<T> *TBSTree<T>::MakeCharT(THNode<T> *&root,int num)
{THNode<T> *b,*c,*d,*e,*f,*g,*null=NULL;
 if(num==1)
 {e=GetTreeNode('R');
  f=GetTreeNode('W');
  d=GetTreeNode('P',e,f);
  g=GetTreeNode('Q');
  b=GetTreeNode('N',d,g);
  c=GetTreeNode('O');
  root=GetTreeNode('M',b,c);
 }
 else {
  g=GetTreeNode('G');
  d=GetTreeNode('D',null,g);
  b=GetTreeNode('B',d);
  e=GetTreeNode('E');
  f=GetTreeNode('F');
  c=GetTreeNode('C',e,f);
  root=GetTreeNode('A',b,c);
 }
 return root;
}
template<class T>
void TBSTree<T>::CreateBiTree(THNode<T> *&tr)
{char ch;
 cin>>ch;
 if(ch=='#') tr=NULL;
 else
 {tr=new THNode<T>;
  tr->lflag=tr->rflag=0;
  if(!tr)
   {cerr<<"內(nèi)存分配失敗!\n";exit(1);}
  tr->data=ch;
  CreateBiTree(tr->left);
  CreateBiTree(tr->right);
 }
}
template<class T>
void TBSTree<T>::InThread1(THNode<T> *&root)
{static THNode<T> *pre;
 if(root!=NULL)
 {if(root->left==NULL)
    root->lflag=1;
  if(root->right==NULL)
    root->rflag=1;
  if((pre!=NULL)&&(root->lflag==1))
    root->left=pre;
  if((pre!=NULL)&&(pre->rflag==1))
    pre->right=root;
  pre=root;
  if(root->lflag==0)
    InThread(root->left);
  if(root->rflag==0)
    InThread(root->right);
 }
}
template<class T>
void TBSTree<T>::InThread(THNode<T> *&root)
{static THNode<T> *pre;
 if(root!=NULL)
 {InThread(root->left);
  if(root->left==NULL)
    root->lflag=1;
  if(root->right==NULL)
    root->rflag=1;
  if((pre!=NULL)&&(root->lflag==1))
    root->left=pre;
  if((pre!=NULL)&&(pre->rflag==1))
    pre->right=root;
  pre=root;
  if(root->rflag==0)
    InThread(root->right);
 }
}
template<class T>
void TBSTree<T>::InThread2(THNode<T> *&root)
{static THNode<T> *pre;
 if(root!=NULL)
 {InThread(root->left);
  InThread(root->right);
  if(root->left==NULL)
    root->lflag=1;
  if(root->right==NULL)
    root->rflag=1;
  if((pre!=NULL)&&(root->lflag==1))
    root->left=pre;
  if((pre!=NULL)&&(pre->rflag==1))
    pre->right=root;
  pre=root;
 }
}
template<class T>
void TBSTree<T>::ThInorder(THNode<T> *&root)
{THNode<T> *p;
 if(root==NULL) return;
 p=root;
 while(p->lflag==0)
  p=p->left;
  do
  {cout<<p->data<<"  ";
   if(p->rflag==1)
     p=p->right;
   else
    {p=p->right;
     while(p->lflag==0)
      p=p->left;
    }
  }while(p!=NULL);
}
//線索二叉樹類相關(guān)操作的測試TBSTree1M.cpp
#include<iostream.h>
#include<iomanip.h>
#include<stdlib.h>
#include<conio.h>
#include "TBSTree1.h"

void main()
{cout<<"TBSTree1M.cpp運(yùn)行結(jié)果:\n";
 THNode<char> *q,*p;
 TBSTree<char> t;
 q=t.MakeCharT(q,2);
 cout<<"線索二叉樹的中序正向遍歷序列為:\n";
 t.InThread(q);
 t.ThInorder(q);
 TBSTree<char> d;
 p=d.MakeCharT(p,1);
 cout<<"\n線索二叉樹的中序正向遍歷序列為:\n";
 d.InThread(p);
 d.ThInorder(p);
 getch();}
TBSTree1M.cpp運(yùn)行結(jié)果:
線索二叉樹的中序正向遍歷序列為:
D  G  B  A  E  C  F  
線索二叉樹的中序正向遍歷序列為:
R  P  W  N  Q  M  O