二叉樹遍歷-非遞歸-Cpp代碼-中序

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

//定義二叉樹結點鏈式存儲結構
struct BiTNode{
        int data;//數據域
        struct BiTNode *lchild,*rchild;//左右孩子指針
}*BiTree;

//中序遍歷函數聲明
int InOrder(struct BiTNode *BiTree);

int main()  
{
        //初始化結點
        struct BiTNode node1,node2,node3,node4,node5,node6,node7,node8,node9,node10,node11;
        node1=(struct BiTNode){6,&node2,&node3};
        node2=(struct BiTNode){4,&node4,&node5};
        node3=(struct BiTNode){8,&node6,&node7};
        node4=(struct BiTNode){1,NULL,&node8};
        node5=(struct BiTNode){5,NULL,NULL};
        node6=(struct BiTNode){7,NULL,NULL};
        node7=(struct BiTNode){11,&node9,NULL};
        node8=(struct BiTNode){3,&node10,NULL};
        node9=(struct BiTNode){9,NULL,&node11};
        node10=(struct BiTNode){2,NULL,NULL};
        node11=(struct BiTNode){10,NULL,NULL};

        //建樹
        BiTree=&node1;

        InOrder(BiTree);
        cout << endl;
        return 0;  
}

//中序遍歷-非遞歸實現
int InOrder(struct BiTNode *BiTree){
        stack<struct BiTNode*> s;
        struct BiTNode *p;//遍歷指針
        p=BiTree;
        if(BiTree==NULL){return 0;}
        while(p||!s.empty()){
                if(p){
                        s.push(p);
                        //cout << "壓棧：" << p->data << endl;
                        p=p->lchild;
                } else {
                        p=s.top();
                        cout << p->data << " ";
                        s.pop();
                        p=p->rchild;
                }
        }
        return 0;
}