编译环境：vc6.0++
目的：单向链表的建立
代码：
#include "stdio.h"
#include <malloc.h>

struct LNode
{
    int data;
    struct LNode*next;
};

struct LNode*create(int n)
{
    int i,a;
    struct *head;
    struct *p1;
    struct *p2;
    head=NULL;
    printf("Input the integers:\n");
    for(i=n;i>0;--i)
    {
        p1=(struct LNode*)malloc(sizeof(struct LNode));
        scanf("%d",&a);
        p1->data=a;
        if(head==NULL)
        {
            head=p1;
            p2=p1;
        }
        else
        {
            p2->next=p1;
            p2=p1;
        }
    }
    p2->next=NULL;
    return head;
}


main()
{
    int n;
    struct LNode *q;
    printf("Iput the count of the nodes you want to creat:");
    scanf("%d",&n);
    q=create(n);
    printf("The result is:\n");
    while(q)
    {
        printf("%d ",q->data);
        q=q->next;
    }
    getch();
}


问题：语句p1->data=a;  总报错：error C2037: left of 'data' specifies undefined struct/union '$S2'
请知道的指点下为什么

解决了书写错误悲剧啊