//参考博客：https://blog.csdn.net/weixin_37716512/article/details/104068102
#include <iostream>  //引入头文件
using namespace std;

typedef int Elemtype;

#define Maxsize 10
#define ERROR 0
#define OK    1

typedef struct Linknode
{
	Elemtype data;   // 数据域
	struct Linknode *next;   //指针域
}Linknode,* LinkStack;


void InitStack(LinkStack& L)
{
	L = (LinkStack)malloc(sizeof(Linknode));
	L->next = NULL;
}

bool StackEmpty(LinkStack L)
{
	if (L->next == NULL)   //堆空
	{
		cout<<"栈为空"<<endl;
		return ERROR;
	}
	else              //不空
	{
		cout << "栈不为空" << endl;
		return OK;
	}
}

bool Push(LinkStack &L, Elemtype e)
{
	Linknode *s = (LinkStack)malloc(sizeof(Linknode));
	s->data = e;
	s->next = L->next;
	L->next = s;
	return OK;
}

bool Pop(LinkStack& L, Elemtype &e)
{
	if (L->next == NULL)
	{
		cout << "栈为空" << endl;
		return ERROR;
	}
	Linknode* p = L->next;
	e = p->data;
	L->next = p->next;
	cout << "出栈元素值为: " << e << endl;
	free(p);
	return OK;
}

bool GetTop(LinkStack& L, Elemtype& e)
{
	if (L->next == NULL)
	{
		cout << "栈为空" << endl;
		return ERROR;
	}
	e = L->next->data;
	cout << "栈顶元素值为: " << e << endl;
	return OK;
}

void PrintStack(LinkStack L)
{
	Linknode* p= L->next;
	while (p != NULL)
	{
		cout << "|______" << p->data << "______|" << endl;
		p = p->next;
	}
}
int main(void)
{
	LinkStack S = NULL;
	InitStack(S);
	StackEmpty(S);
	Push(S, 1);
	Push(S, 2);
	Push(S, 3);
	Push(S, 4);
	StackEmpty(S);
	PrintStack(S);
	int e = 0, x = 0;
	Pop(S, e);
	PrintStack(S);
	GetTop(S, x);
}