学步园

以下代码利用单向链表实现数据结构栈。分别实现了栈的基本操作方法：

1： 入栈  void push()

2:   出栈  bool pop()

3:   得到栈顶元素 bool top(int * value)

4:   判断栈是否为空 bool empty()

5:   得到栈的大小 int size()

6:  输出栈内元素 void output()

#include "Stack.h"


//构造一个空栈，头指针为空，数据项为栈的长度
CStack::CStack(void)
{
	m_value = 0xFFFFFFFF;
	m_pnext = NULL;
}


CStack::~CStack(void)
{
	printf("delete %d\n", m_value);
}

void CStack::destroy()
{
	CStack *pnode = this;
	while(m_pnext != NULL)
	{
		CStack *ptemp = m_pnext;
		m_pnext = m_pnext->m_pnext;	
		delete ptemp;
	}
}

void CStack::push(int value)
{
	CStack *newnode = new CStack;
	newnode->m_value = value;
	newnode->m_pnext = this->m_pnext;
	this->m_pnext = newnode;
	m_value++;
}

bool CStack::pop()
{
	if (m_pnext == NULL)
	{
		return false;
	}
	else
	{
		m_pnext = m_pnext->m_pnext;
	}
	m_value--;
	return true;
}

bool CStack::top(int *value)
{
	if (m_pnext != NULL)
	{
		*value = m_pnext->m_value;
		return true;
	}
	*value = 0xFFFFFFFF;
	return false;
}


int CStack::size()
{
	CStack *pnode = this;
	int count = 0;
	while(pnode->m_pnext != NULL)
	{
		count++;
		pnode = pnode->m_pnext;
	}
	return count;
}

bool CStack::empty()
{
	if (m_pnext == NULL)
	{
		return true;
	}
	return false;
}

void CStack::output()
{
	CStack *pnode = this;
	int count = 0;
	while(pnode->m_pnext != NULL)
	{
		printf("index=%d value=%d\n", count, pnode->m_pnext->m_value);
		pnode = pnode->m_pnext;
	}
}