C语言数据结构链表尾插法有关问题！求解释

typedef struct LNode{
    ElemType date;
    struct LNode *next;
}*LinkList;

//Initial LinkList
void InitL(LinkList &L){
    L = (LinkList)malloc(sizeof(LNode));//we just need a RAM directory to told us where the LinkList is.
    L->next = NULL;
}

//Create LinkList
void CreateL(LinkList &L){
    int len;    //Firstly,we need to known the length of the LinkList.
    printf("Please input L length:");
    scanf("%d", &len);
    for(int i = 0 ; i < len; i++){
        LinkList p = (LinkList)malloc(sizeof(LNode));    //or LinkList p = new LNode(c++)
        if(!p)
            printf("Error\n");
        printf("Please input LinkList number:");
        scanf("%d", &p->date);
                  //tail insert
                  L->next = p;
                  L = p;
    }

}