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02preorder.cpp

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#include<iostream>

using namespace std;

//TreeNode

class Node{

public:

int val;

Node* left;

Node* right;

Node(int val){

this->val = val;

this->left = nullptr;

this->right = nullptr;

}

};

void displaypre(Node* root){

if(root==nullptr) return;

cout<<root->val<<" ";

displaypre(root->left);

displaypre(root->right);

}

void displayin(Node* root){

if(root==nullptr) return;

displayin(root->left);

cout<<root->val<<" ";

displayin(root->right);

}

void displaypost(Node* root){

if(root==nullptr) return;

displaypost(root->left);

displaypost(root->right);

cout<<root->val<<" ";

}

int main(){

Node* a = new Node(10);

Node* b = new Node(20);

Node* c = new Node(30);

Node* d = new Node(40);

Node* e = new Node(50);

Node* f = new Node(60);

Node* g = new Node(70);

a->left = b; a->right = c;

b->left = d; b->right = e;

c->left = f; c->right = g;

displaypre(a);

cout<<endl;

displayin(a);

cout<<endl;

displaypost(a);

}