模拟实现链栈

#include<stdio.h>
#include<malloc.h>
#include<CertExit.h>
#include<assert.h>
typedef int DataType;
typedef struct node
{
    DataType data;
    struct node* pNext;
}*PNode,Node;
typedef struct linkStack
{
    PNode top;
    size_t sz;
}*LinkStack;
LinkStack creat()
{
    LinkStack lstack = (LinkStack)malloc(sizeof(struct linkStack));
    if (NULL == lstack)
    {
        exit(0);
    }
    lstack->top = nullptr;
    lstack->sz = 0;
    return lstack;
}
int IsEmpty(LinkStack lstack)
{
    assert(lstack);
    if (nullptr == lstack->top || 0 == lstack->sz)
    {
        return 1;
    }
    return 0;
}
PNode getTop(LinkStack lstack)
{
    if (lstack->sz == 0)
    {
        return nullptr;
    }
    return lstack->top;
}
int getSize(LinkStack lstack)
{   
    assert(lstack);
    return lstack->sz;
}
void PushStack(LinkStack lstack, DataType data)
{
    assert(lstack);
    PNode newNode = (PNode)malloc(sizeof(Node));
    if (NULL == newNode)
    {
        printf("内存分配失败！！");
        exit(0);
    }
    newNode->data = data;
    newNode->pNext = getTop(lstack);
    lstack->top = newNode;
    lstack->sz++;
}
PNode PopStack(LinkStack lstack)
{
    if (IsEmpty(lstack))
    {
        return NULL;
    }
    PNode node = lstack->top;
    lstack->top = lstack->top->pNext;
    --(lstack->sz);
    return node;
}
void DestroyStack(LinkStack lstack)
{
    if (IsEmpty(lstack))
    {
        free(lstack);
        lstack = nullptr;
        printf("链栈已空，无需删除\n");
        return;
    }
    do
    {
        PNode pTemp;
        pTemp = PopStack(lstack);
        free(pTemp);
    } while (lstack->sz > 0);
    printf("链栈销毁成功");

}

int main()
{
    LinkStack lstack = creat();
    PushStack(lstack, 10);
    PushStack(lstack, 20);
    PushStack(lstack, 60);
    PushStack(lstack, 70);
    PushStack(lstack, 40);
    while (lstack->sz > 0)
    {
        printf("%d\t", PopStack(lstack)->data);
    }
    system("pause");
}