链栈

#include<malloc.h>
using namespace std;

#define Elemtype int
#define Maxsize 50
//带有头部节点的链栈
typedef struct LinkNode{
   Elemtype data;
   struct LinkNode *next;
}*LiStack;


//初始化
void InitStack(LiStack &L)
{
    L = (LinkNode*)malloc(sizeof(LinkNode));
    L->next = nullptr;
}

//栈判空
bool StackEmpty(LiStack L)
{
    if(L->next == nullptr)
    {
        printf("栈为空\n");
        return false;
    }
    else
    {
        printf("栈不为空\n");
        return true;
    }
}



//入栈
bool Push(LiStack &L,int e)
{
    LinkNode *s = (LinkNode*)malloc(sizeof(LinkNode));
    s->data = e;
    s->next = L->next;
    L->next = s;
    return true;
}


//出栈
bool Pop(LiStack &L,int &e)
{
    if(L->next == nullptr)
    {
        printf("栈已空\n");
        return false;
    }
    LinkNode *p = L->next;
    e = p->data;
    L->next = p->next;
    printf("出栈元素值为%d\n",e);
    free(p);
    return true;
}

//获取顶部元素
bool GetTop(LiStack L,int x)
{
    if(L->next == nullptr)
    {
        printf("栈已空\n");
        return false;
    }
    LinkNode *p = L->next;
    x = p->data;
    printf("栈顶元素值为%d\n",x);
    return true;
}

//打印栈
void PrintStack(LiStack L)
{
    LinkNode *n = L->next;
    while(n != nullptr)
    {
        printf("|___%d___|\n",n->data);
        n = n ->next;
    }
}





int main()
{
    LiStack s;
	InitStack(s);
	StackEmpty(s);
	Push(s,1);
	Push(s,2);
	Push(s,3);
	Push(s,4);
	StackEmpty(s);
	PrintStack(s);
	int e,x;
	Pop(s,e);
	PrintStack(s);
	GetTop(s,x);
    return 0;
}