使用单链列表的C ++堆栈类模板实现

Question

我正在尝试使用单链表在c ++中实现堆栈，但是遇到了一些问题。推送工作正常，但弹出菜单删除了顶部，但无法更新到下一个。另外，打印功能正在获取读取访问冲突异常。任何帮助将不胜感激！

#include <iostream>  
using namespace std;

template <class T>

class node {
public:
  T data;
  node<T>* next;
};  

template <class T>

class Stack {
private:
  node<T>* top;
public:
  Stack() {
    top = nullptr;
}
bool isEmpty() {
    if (top == nullptr)
        return false;
    else
        return true;
}
T Top() {
    if (top)
        return top->data;
    else
        cout << "Stack is empty" << endl;
}
void push(const T & val) {
    if (top == nullptr) {
        top = new node<T>;
        top->next = nullptr;
        top->data = val;
    }
    else {
        node<T>* temp = new node<T>;
        temp->data = val;
        top->next = temp;
        top = temp;
    }
}
void pop() {
    if (top == nullptr) {
        cout << "Stack is empty" << endl;
        return;
    }
    else {
        cout << top->data << " is popped" << endl;
        node<T>* temp = top;
        top = top->next;
        delete temp;
    }
}
void print() {
    node<T>* temp = top;
    while (temp != nullptr)
    {
        cout << temp->data << " ";
        temp = temp->next;
    }
   }
   };  

测试堆栈类的主要功能

 int main()
 {
    Stack<int> s;
 bool flag = true;
 while (flag)
 {
     cout << "1. Push   2. Pop    3. Print    4. Quit" << endl;
     int choice;
     cin >> choice;
     switch (choice) {
     case(1):
         cout << "Enter a number to push in Stack?";
         int n;
         cin >> n;
         s.push(n);
         break;
     case(2):
         s.pop();
         break;
     case(3):
         s.print();
         break;
     case(4):
         cout << "Quitting program........." << endl;
         return 1;
     default:
         cout << "Invalid choice!!" << endl;
         break;
     }
  }
 return 0;
 }