convert a tree into its mirror

#include<iostream>
using namespace std;

class Node{
  public:
      int data;
      Node *left,*right;
      Node(int key){
        data=key;
        left=NULL;
        right=NULL;
        }
  };

void Inorder(Node* root){
  if(root==NULL)
     return;
  Inorder(root->left);
  cout<<" "<<root->data;
  Inorder(root->right);
  }

void Mirror(Node* root){
  if(root==NULL)
    return ;
  Node* temp=root->left;
  root->left=root->right;
  root->right=temp;
  Mirror(root->left);
  Mirror(root->right);
  }

int main(){
  Node *root=NULL;
  Node *newnode=new Node(1);
  root=newnode;
  root->left=new Node(9);
  root->right=new Node(3);
  (root->left)->left=new Node(2);
  (root->right)->right=new Node(4);
  Inorder(root);
  Mirror(root);
  cout<<endl<<"after making mirror tree :"<<endl;
  Inorder(root);
  return 0;
  }