数据结构二叉树——递归遍历



#include <iostream>
#include <cstdlib>
using namespace std;

struct BinTreeNode{
 int date;
 BinTreeNode *liftChild, *rightChild;
}

class BinaryTree{
public:
 BinaryTree();
 BinaryTree(BinaryTree &s);
 ~BinaryTree();
 void CreateBinTree(BinTreeNode *&SubTree);
 bool IsEmpty();
 void InOrder();
 void InOrder(BinTreeNode *subTree);
 void PreOrder();
 void PreOrder(BinTreeNode *subTree);
 void PostOrder();
 void PostOrder(BinTreeNode *subTree);
 int Count();
 int Count(BinTreeNode *subTree);

private:
 BinTreeNode *root;

};
//构造函数
BinaryTree::BinaryTree():root(NULL){}
BinaryTree::BinaryTree(BinaryTree &s){

}

//判空
bool BinaryTree::IsEmpty(){
 return root == NULL ? true : false;
}
//中序遍历
void BinaryTree::InOrder(){
 InOrder(root);
}
void BinaryTree::InOrder(BinTreeNode *subTree){
 if(subTree != NULL){
  InOrder(subTree->liftChild);
  cout << subTree->date;
  InOrder(subTree->rightChild);
 }
}

//先序遍历
void BinaryTree::PreOrder(){
 PreOrder(root);
}
void BinaryTree::PreOrder(BinTreeNode *subTree){
 if(subTree != NULL){
  cout << subTree->date;
  PreOrder(subTree->liftChild);
  PreOrder(subTree->rightChild);
 }
}

//后续遍历
void BinaryTree::PostOrder(){

 PostOrder(root);
}
void BinaryTree::PostOrder(BinTreeNode *subTree){
 if(subTree != NULL){
  PostOrder(subTree->liftChild);
  PostOrder(subTree->rightChild);
  cout << subTree->date;
 }
}

int main(){

 system("pause");
 return 0;
}

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