print elements between a given range

#include<iostream>
using namespace std;

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

void Print(Node* root,int first,int last){
  if(root==NULL)
    return;
  if(first<root->data)
    Print(root->left,first,last);
  if(root->data>=first && root->data<=last)
    cout<<" "<<root->data;
  if(root->data<last)
    Print(root->right,first,last);
  }

void Insert(Node **root_ref,int key){
  if(*root_ref==NULL){
    *root_ref=new Node(key);
    return;
    }
  if((*root_ref)->data<key)
    Insert(&((*root_ref)->right),key);
  else
     if((*root_ref)->data>key)
       Insert(&((*root_ref)->left),key);
  }

int main(){
 Node *root=NULL;
 Insert(&root,5);
 Insert(&root,7);
 Insert(&root,2);
 Insert(&root,8);
 int k1=0,k2=10;
 Print(root,k1,k2);
 return 0;
 }