自定义一个链式栈，c++语言实现，不足之处，还望指正！
复制代码 代码如下:
// MyStack.cpp : 定义控制台应用程序的入口点。
//自己构造一个链式栈，具有push（入栈），pop（出栈），top（取得栈顶元素），size（返回栈大小），empty（判断是否为空）等功能
#include "stdafx.h"
#include <iostream>
using namespace std;
//构造栈的节点
template <class T>
struct NODE
{
NODE<T>* next;
T data;
};
template <class T>
class MyStack
{
public:
MyStack()
{
phead = new NODE<T>;
if (phead == NULL)
{
cout << "Failed to malloc a new node. " << endl;
}
else
{
phead->data = NULL;
phead->next = NULL;
}
}

//入栈
void push(T e)
{
NODE<T>* p = new NODE<T>;
if (p == NULL)
{
cout << "Failed to malloc a new node. " << endl;
}
else
{
p->data = e;
p->next = phead->next;
phead->next = p;
}
}

//出栈
T pop()
{
T e;
NODE<T>* p = phead->next;
if(p != NULL)
{
phead->next = p->next;
e = p->data;
delete p;
return e;
}
else
{
cout << "There is no elements in the stack." << endl;
return NULL;
}
}

//取得栈顶元素
T top()
{
T e;
NODE<T>* p = phead->next;
if (p != NULL)
{
e = p->data;
return e;
}
else
{
cout << "There is no elements in the stack." << endl;
return NULL;
}
}
//取得栈中元素个数
int size()
{
int count(0);
NODE<T>* p = phead->next;
while (p != NULL)
{
p = p->next;
count++;
}
return count;
}
//判断stack是否为空
bool empty()
{
NODE<T>* p = phead;
if (p->next == NULL)
{
return true;
}
else
{
return false;
}
}
private:
NODE<T>* phead;
};
int _tmain(int argc, _TCHAR* argv[])
{
MyStack<int> sta;
sta.push(1);
sta.push(2);
sta.push(3);
cout << "The size of the stack now is " << sta.size() << endl;
sta.pop();
cout << "The top element is " << sta.top() << endl;
cout << "The size of the stack now is" << sta.size() << endl;
if (sta.empty())
{
cout << "This stack is empty." << endl;
}
else
{
cout << "This stack is not empty." << endl;
}
return 0;
}