大家说下如何把链表里面的数据放到一个数组里面

大家说下怎么把链表里面的数据放到一个数组里面
#include <stdio.h>
#include <stdlib.h>

typedef struct node
{
 int nDate;
 struct node *pstnext;
}Node;

//链表建立
Node* creat()
{
 Node *head = NULL, *p = NULL, *s = NULL;
 int Date = 0, cycle = 1;
 head = (Node*)malloc(sizeof(Node));
 if(NULL == head)
 {
  printf("分配内存失败\r\n");
  return NULL;
 }
 head->pstnext = NULL;
 
 p = head;
 while(cycle)
 {
  printf("请输入数据且当输入数据为0时结束输入\r\n");
  scanf("%d", &Date);
  if(0 != Date)
  {
  s = (Node*)malloc(sizeof(Node));
  if(NULL == s)
  {
  printf("分配内存失败\r\n");
  return NULL;
  }
  s->nDate = Date;
  p->pstnext = s;
  p = s;
  }
  else
  {
  cycle = 0;
  }
 }
 p->pstnext = NULL;
 return(head);
}

//链表输出
int output(Node *head)//获取数据元素个数n 为存放到数组做好准备
{
  int n=0;
  Node *p = head;
 while(NULL != p)
 {
n++;
  printf("%d ", p->nDate); 
  p = p->pstnext;
 }
 printf("\r\n");
 return n;
}
int *lookup(Node *head)//把链表的数据放到数组a[k]里面去
{
int k=output(head);
Node *p=head;
int a[k];
for(int i=0;i<k;i++)
{
a[i]=p->nDate;
p=p->pstnext;
}
return a;
}
int main()
{
int *a;

Node *head=creat();
int k=output(head);
//creat();
a=lookup(head);
for(int i=0;i<k;i++)
{
printf("%d ",a[i]);
}
return 0;

}
我的源代码 有错误如下 大家帮我看看
sd.c
C:\Documents and Settings\郑奇文\sd.c(67) : error C2057: expected constant expression
C:\Documents and Settings\郑奇文\sd.c(67) : error C2466: cannot allocate an array of constant size 0
C:\Documents and Settings\郑奇文\sd.c(67) : error C2133: 'a' : unknown size
C:\Documents and Settings\郑奇文\sd.c(68) : error C2143: syntax error : missing ';' before 'type'
C:\Documents and Settings\郑奇文\sd.c(68) : error C2143: syntax error : missing ';' before 'type'
C:\Documents and Settings\郑奇文\sd.c(68) : error C2143: syntax error : missing ')' before 'type'
C:\Documents and Settings\郑奇文\sd.c(68) : error C2143: syntax error : missing ';' before 'type'
C:\Documents and Settings\郑奇文\sd.c(68) : error C2065: 'i' : undeclared identifier
C:\Documents and Settings\郑奇文\sd.c(68) : warning C4552: '<' : operator has no effect; expected operator with side-effect
C:\Documents and Settings\郑奇文\sd.c(68) : error C2059: syntax error : ')'
C:\Documents and Settings\郑奇文\sd.c(69) : error C2143: syntax error : missing ';' before '{'
C:\Documents and Settings\郑奇文\sd.c(73) : warning C4172: returning address of local variable or temporary
C:\Documents and Settings\郑奇文\sd.c(83) : error C2143: syntax error : missing ';' before 'type'
C:\Documents and Settings\郑奇文\sd.c(83) : error C2143: syntax error : missing ';' before 'type'
C:\Documents and Settings\郑奇文\sd.c(83) : error C2143: syntax error : missing ')' before 'type'
C:\Documents and Settings\郑奇文\sd.c(83) : error C2143: syntax error : missing ';' before 'type'
C:\Documents and Settings\郑奇文\sd.c(83) : warning C4552: '<' : operator has no effect; expected operator with side-effect
C:\Documents and Settings\郑奇文\sd.c(83) : error C2059: syntax error : ')'
C:\Documents and Settings\郑奇文\sd.c(84) : error C2143: syntax error : missing ';' before '{'
执行 cl.exe 时出错.

sd.obj - 1 error(s), 0 warning(s)



------解决方案--------------------

C/C++ code

int *lookup(Node *head)//把链表的数据放到数组a[k]里面去{    int k=output(head);    Node *p=head;    int *a = (int *)malloc(k*sizeof(int));    for(int i=0;i<k;i++)    {        a[i]=p->nDate;        p=p->pstnext;    }    return a;}