Use C++ to implement the queue program code

C++ to achieve the queue, if there are shortcomings, also hope to correct

//Myqueue.cpp: defines the entry point for the console application.
//Implement a chained queue, including a header. Queue operations include pop at the end of the queue, push at the end of the queue,
//Get the team head element (front_element), the team tail element (back_element), the number of queue elements (size),
//Whether the queue is empty (empty).
#include "stdafx.h"
#include <iostream>
using namespace std;
//Defines the node structure of the queue
template <class T>
struct NODE
{
 NODE<T>* next;
 T data;
};
template <class T>
class MyQueue
{
public:
 MyQueue()
 {
  NODE<T>* p = new NODE<T>;
  if (NULL == p)
  {
   cout << "Failed to malloc the node." << endl;
  }
  p->data = NULL;
  p->next = NULL;
  front = p;
  rear = p;
 }
//Join at the back of the line
 void push(T e)
 {
  NODE<T>* p = new NODE<T>;
  if (NULL == p)
  {
   cout << "Failed to malloc the node." << endl;
  }
  p->data = e;
  p->next = NULL;
  rear->next = p;
  rear = p;
 }
//At the head of the team
 T pop()
 {
  T e;
  if (front == rear)
  {
   cout << "The queue is empty." << endl;
   return NULL;
  }
  else
  {
   NODE<T>* p = front->next;
   front->next = p->next;
   e = p->data;
   //Notice that when there is only one element and it is removed, the node that rear points to is removed
   //It should point to the header
   if (rear == p)
   {
    rear = front;
   }
   delete p; p = NULL;
   return e;
  }
 }
 //Gets the queue head element
 T front_element()
 {
  if (front == rear)
  {
   cout << "The queue is empty." << endl;
   return NULL;
  }
  else
  {
   NODE<T>* p = front->next;
   return p->data;
  }
 }
 T back_element()
 {
  if (front == rear)
  {
   cout << "The queue is empty." << endl;
   return NULL;
  }
  else
  {
   return rear->data;
  }
 }

 //Gets the number of queue elements
 int size()
 {
  int count(0);
  NODE<T>* p = front;
  while (p != rear)
  {
   p = p->next;
   count++;
  }
  return count;
 }

 //Determines if the queue is empty
 bool empty()
 {
  if (front == rear)
  {
   return true;
  }
  else
  {
   return false;
  }
 }
private:
 NODE<T>* front; //Pointer to the header. The front -> Next -> Data is the first element in the header.
 NODE<T>* rear;//Pointer to the end of the queue (the last element added)
};
int _tmain(int argc, _TCHAR* argv[])
{
 MyQueue<int> myqueue;
 cout << myqueue.size() << endl;
 myqueue.push(10);
 myqueue.push(20);
 myqueue.push(30);
 cout << myqueue.front_element() << endl;
 cout << myqueue.back_element() << endl;
 myqueue.pop();
 if (myqueue.empty())
 {
  cout << "The queue is empty now." << endl;
 }
 else
 {
  cout << "The queue has " << myqueue.size() << " elements now." << endl;
 }
 myqueue.pop();
 myqueue.pop();
 if (myqueue.empty())
 {
  cout << "The queue is empty now." << endl;
 }
 else
 {
  cout << "The queue has " << myqueue.size() << " elements now." << endl;
 }
 return 0;
}