怎么把单链表长度去掉啊（就是不要请输入链表的长度），求求解

#include<stdio.h>
#include<stdlib.h>
#define OK 1
#define ERROR -1
typedef int Status;
typedef int ElemType;
typedef struct LNode{
ElemType data;
struct LNode *next;
}LNode,*LinkList;

Status InitList(LinkList &L){
L = new LNode;
L->next = NULL;
return OK;
}

void CreateList(LinkList &L,int m){
LinkList t;
printf("请输入数值：");
for(int p = 0 ; p < m ; p++){
t = new LNode;
scanf("%d",&t->data);
t->next = L->next;
L->next = t;
}
}
int GetMax(LinkList L){
LNode *pmax,*p;
if(L->next == NULL)
return NULL;
pmax = L->next;
p = L->next->next;
while (p){
if(p->data > pmax->data)
pmax = p;
p = p->next;
}
return pmax->data;
}

int main(){
int n,a;
LinkList L;
InitList(L);
printf("请输入链表的长度：");
scanf("%d",&n);
CreateList(L,n);
a=GetMax(L);
printf("最大结点：%d\n",a);
return 0;
}

修改如下，供参考：

#include<stdio.h>
#include<stdlib.h>
#define OK 1
#define ERROR -1
typedef int Status;
typedef int ElemType;
typedef struct LNode{
    ElemType data;
    struct LNode *next;
}LNode,*LinkList;

Status InitList(LinkList &L){
    L = new LNode;
    L->next = NULL;
    return OK;
}

void CreateList(LinkList &L,int m){
    LinkList t;
    printf("请输入数值：");
    for(int p = 0 ; p < m ; p++){
        t = new LNode;
        scanf("%d",&t->data);
        t->next = L->next;
        L->next = t;
    }
}
void CreateList_1(LinkList &L){ //修改
    LinkList t;
    ElemType data;
    printf("请输入数值(-1:结束输入)：");
    while (1){
        scanf("%d",&data);
        if (data == -1) break;
        t = new LNode;
        t->data = data;
        t->next = L->next;
        L->next = t;
    }
}
int GetMax(LinkList L){
    LNode *pmax,*p;
    if(L->next == NULL)
       return NULL;
    pmax = L->next;
    p = L->next->next;
    while (p){
       if(p->data > pmax->data)
          pmax = p;
       p = p->next;
    }
    return pmax->data;
}

int main(){
    int n,a;
    LinkList L,L1;  //修改
    //InitList(L);
    InitList(L1);   //修改
    //printf("请输入链表的长度：");
    //scanf("%d",&n);
    //CreateList(L,n);
    CreateList_1(L1);//修改
    a=GetMax(L1);    //修改
    printf("最大结点：%d\n",a);

    return 0;
}