编译通过，可是在运行的时候，出栈根本不显示~求大神帮忙解决~代码如下：
#include <stdio.h>
#include <malloc.h>
typedef char ElemType;
typedef struct lsnode{
    ElemType data;
    struct lsnode *next;
}LinkStack;
void InitStack(LinkStack *ls)
{
    ls = NULL;
}
int StackEmpty(LinkStack *ls)
{
    if(ls == NULL)
        return 1;
    else
        return 0;
}
void Push(LinkStack *ls,ElemType x)
{
    LinkStack *p;
     p = (LinkStack *)malloc(sizeof(LinkStack));
     p ->data = x;
     p ->next = ls;
     ls = p;
}
int Geop(LinkStack *ls,ElemType *x)
{
    if(ls == NULL)
        return 0;
    else
    {
        *x = ls ->data;
        return 1;
    }
}
int Pop(LinkStack *ls,ElemType *x)
{
    LinkStack *p;
    if(ls == NULL)
        return 0;
    else
    {
        p = ls;
        *x = p ->data;
        ls = p ->next;
        free(p);
        return 1;
    }
}
void main(void)
{
    LinkStack *ls;
    ElemType e;
    ls = (LinkStack *)malloc(sizeof(LinkStack));
    InitStack(ls);
    printf("Stack %s\n",(StackEmpty(ls)==1?"empty":"inempty"));
    printf("Push a into Stack\n");
    Push(ls,'a');
    printf("Push b into Stack\n");
    Push(ls,'b');
    printf("Push c into Stack\n");
    Push(ls,'c');
    printf("Push d into Stack\n");
    Push(ls,'d');
    printf("Stack %s\n",(StackEmpty(ls)==1?"empty":"inempty"));
    Geop(ls,&e);
    printf("Get the top one:%c\n",e);
    printf("Pop in order\n");
    while(!StackEmpty(ls))
    {
       Pop(ls,&e);
       printf("%c\n",e);
    }
    printf("\n");
}