头插法与尾插法

void CreateList_Head(LinkList &L){
	L=(LinkList)malloc(sizeof(LNode));
	L->next=NULL;
	LinkList s;int x;
	scanf("%d",&x);
	while(x!=9999){
		s=(LinkList)malloc(sizeof(LNode));
		s->data=x;
		s->next=L->next;
		L->next=s;
		scanf("%d",&x);
	}
}

void CreateList_Tail(LinkList &L){
	L=(LinkList)malloc(sizeof(LNode));
	LinkList s,r=L;int x;
	scanf("%d",&x);
	while(x!=9999){
		s=(LinkList)malloc(sizeof(LNode));
		s->data=x;
		r->next=s;
		r=s;
		scanf("%d",&x);
	}
	r->next=NULL;
}