二叉树

//以下是头文件 BTree.h
struct BTreeNode{
    ElemType data;
    BTreeNode* left;
    BTreeNode* right;
};
void InitBTree(BTreeNode* &BT)
{
    BT=NULL;
}
void CreateBTree(BTreeNode* &BT,char* a)
{
    BTreeNode* s[10];
    int top=-1;
    BT=NULL;
    BTreeNode *p;
    int k;
    istrstream ins(a);
    char ch;
    ins >>ch;
    while(ch!='@')
    {
        switch(ch)
        {
        case '(':
            top++;s[top]=p;k=1;
            break;
        case')':
            top--;
            break;
        case',':
            k=2;
            break;
        default:
            p=new BTreeNode;
            p->data=ch;p->left=p->right=NULL;
            if(BT==NULL)
                BT=p;
            else{
                switch(k)
                {
                case 1:
                    s[top]->left=p;
                    break;
                case 2:
                    s[top]->right=p;
                }
            }
        }
        ins>>ch;
    }
}

int BTreeEmpty(BTreeNode* BT)
 {
     return BT==NULL;
 }
 void Preorder(BTreeNode* BT)//前序遍历
 {
     if(BT!=NULL){
         cout<<BT->data<<' ';
         Preorder(BT->left);
         Preorder(BT->right);
     }
 }
 void Inorder(BTreeNode* BT)//中序遍历
 {
     if(BT!=NULL){
         Inorder(BT->left);
         cout<<BT->data<<' ';
         Inorder(BT->right);
     }
 }
 void Postorder(BTreeNode* BT)//后序遍历
 {
     if(BT!=NULL){
         Postorder(BT->left);
         Postorder(BT->right);
         cout<<BT->data<<' ';
     }
 }
 void Levelorder(BTreeNode* BT)
 {
     BTreeNode* q[30];
     int front=0,rear=0;
     BTreeNode* p;
     if(BT!=NULL){
         rear=(rear+1)%30;
         q[rear]=BT;
     }
     while(front!=rear)
     {
         front=(front+1)%30;
         p=q[front];
         cout<<p->data<<' ';
         if(p->left!=NULL){
             rear=(rear+1)%30;
             q[rear]=p->left;
         }
         if(p->right!=NULL)
         {
             rear=(rear+1)%30;
             q[rear]=p->right;
         }
     }
 }
 BTreeDepth(BTreeNode* BT)
 {
     if(BT==NULL)
         return 0;
     else
     {
         int dep1=BTreeDepth(BT->left);
         int dep2=BTreeDepth(BT->right);
         if(dep1>dep2)
             return dep1+1;
         else
             return dep2+1;
     }
 }
 void PrintBTree(BTreeNode* BT)
 {
     if(BT!=NULL)
     {
         cout<<BT->data;
         if(BT->left!=NULL||BT->right!=NULL)
         {
             cout<<'(';
             PrintBTree(BT->left);
             if(BT->right!=NULL)
             cout<<',';
             PrintBTree(BT->right);
             cout<<')';
         }
     }
 }
 void DeleteBTree(BTreeNode* BT)
 {
     if(BT!=NULL)
     {
         DeleteBTree(BT->left);
         DeleteBTree(BT->right);
         delete BT;
     }
 }
 void ClearBTree(BTreeNode* &BT)
 {
     DeleteBTree(BT);
     BT=NULL;
 }


//以下是源文件部分
#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
#include<strstrea.h>
typedef char ElemType;
 

#include"BTree.h"
void main()
{
    BTreeNode* bt;
InitBTree(bt);
char b[50];
cout<<"输入以'@'字符作为结束符的二叉树广义表表示:"<<endl;
cin.getline(b,sizeof(b));
CreateBTree(bt,b);
PrintBTree(bt);
cout<<endl;
cout<<"前序:";
Preorder(bt);cout<<endl;
cout<<"中序:";
Inorder(bt);cout<<endl;
cout<<"后序:";
Postorder(bt);cout<<endl;
cout<<"按层:";
Levelorder(bt);cout<<endl;
cout<<"二叉树的深度为:";
cout<<BTreeDepth(bt)<<endl;
ClearBTree(bt);
getch();
}

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