C++实现栈的操作（push和pop）

栈的组织形式：

如上图所示：栈也是有多个数据节点组成的，每个节点包含有数据域和指向下一个节点的指针域。并且每次的push、pop和判空都是操作的栈顶指针top。

栈中每个数据节点的定义：

class data_node{
public:
	data_node() :data(0), next(NULL){}//default constructer function
	data_node(int value) :data(value), next(NULL){}//include arg constructer function
	int data;
	data_node *next;//pointer that point to next node
};

栈的类的定义：

class my_stack{
public:
	my_stack() :top(NULL){}
	void push(data_node new_data);
	void pop(data_node *pop_node);
	bool empty();
	data_node *top;
};

栈的push操作：

void my_stack::push(data_node new_data)
{
	data_node *pnode = NULL;
	pnode = new data_node(new_data.data);
	pnode->next = top;
	top = pnode;
}

void my_stack::pop(data_node *pop_node)
{
	if (empty())
	{
		printf("this stack is empty\n");
		return;
	}
	pop_node->data = top->data;
	data_node *pnode = top;
	top = top->next;
	delete pnode;
}

bool my_stack::empty()
{
	return (top == NULL);
}

 

---

完整的代码如下：

#include "stdafx.h"
#include <iostream>
#pragma warning(disable:4996)
#include <string>

using namespace std;

class data_node{
public:
	data_node() :data(0), next(NULL){}//default constructer function
	data_node(int value) :data(value), next(NULL){}//include arg constructer function
	int data;
	data_node *next;//pointer that point to next node
};

class my_stack{
public:
	my_stack() :top(NULL){}
	void push(data_node new_data);
	void pop(data_node *pop_node);
	bool empty();
	data_node *top;
};

void my_stack::push(data_node new_data)
{
	data_node *pnode = NULL;
	pnode = new data_node(new_data.data);
	pnode->next = top;
	top = pnode;
}

void my_stack::pop(data_node *pop_node)
{
	if (empty())
	{
		printf("this stack is empty\n");
		return;
	}
	pop_node->data = top->data;
	data_node *pnode = top;
	top = top->next;
	delete pnode;
}

bool my_stack::empty()
{
	return (top == NULL);
}

int main()
{
	data_node pop_node(0);
	my_stack stack;
	stack.push(3);
	stack.push(2);
	stack.push(6);//3,2,6
	stack.pop(&pop_node);
	//printf("is empty? %d\n", stack.empty());
	printf("%2d ", pop_node.data);
	stack.pop(&pop_node);
	//printf("is empty? %d\n", stack.empty());
	printf("%2d ", pop_node.data);
	stack.pop(&pop_node);
	printf("%2d\n ", pop_node.data);
	printf("is empty? %d\n", stack.empty());
	return 0;
}