#include <stdio.h>
#include <stdlib.h>

typedef int ElemType;
typedef struct Lnode{
	ElemType data;
	Lnode *next;
}Lnode,*LinkNode;


int InitLinkList(LinkNode &L){
	L = (LinkNode)malloc(sizeof(Lnode));
	L -> next = NULL;
	printf("init success\n");
	return 0;
} 

int ListEmpty(LinkNode L){
	if (L->next){
		printf("Link is not null\n");
		return 0;
	}
	printf("Link is null\n");
	return 0;
}

int DestoryList (LinkNode &L){
	LinkNode p;
	while(L){
		p = L;
		L = L->next;
		free(p);
	}
	return 0;
}

int clearList(LinkNode &L){
	LinkNode p,q;
	p = L->next;
	while(p){
		q=p->next;
		free(p);
		p=q;
	}
	L->next = NULL;
	return 0;
}

int ListLength(LinkNode L){
	LinkNode p;
	int i = 0;
	p = L->next;
	while(p){
		i++;
		p = p->next;
	}
	printf("%d\n",i);
	return 0;
}


int GetElem(LinkNode L, int i){
	int j =0;
	ElemType e;
	LinkNode p;
	p = L->next;
	while(p&&i>j){
		p = L->next;
		j++;
	}
	e = p->data;
	printf("%d\n",e);
	return 0;
}

int GetElem_Data(LinkNode L, ElemType e){
	LinkNode p;
	ElemType data;
	p = L->next;
	while(p){
		data = p->data;
		if (data == e){
			printf("find in link data is %d\n",e);
			return 0;
		}
		p = p ->next; 
	}
	printf("elem not in link\n");
	return 0;
}

int InsertLinkNode(LinkNode &L, int i, ElemType e){
	LinkNode p,q;
	int j = 0;
	p = L;
	while(p&&j<i-1){
		p = p->next;
		j++;
	}
	if(!p||j>i-1){
		printf("連結串列溢位");
		return 0;
	}
	q = (LinkNode)malloc(sizeof(Lnode));
	q->data = e;
	q->next = p->next;
	p->next = q;
	return 0;
}

int ForData(LinkNode L){
	LinkNode p;
	p = L;
	while(p->next){
		p = p->next;
		printf("%d\n",p->data);
	}
	return 0;
}

int DeleteLinkNode(LinkNode &L, int i){
	LinkNode p,q;
	int j = 0;
	p = L;
	while(p->next&&j<i-1){
		p = p->next;
		j++; 
	}
	if(!(p->next)||j>i-1){
		printf("連結串列溢位");
		return 0;
	}
	q = p->next;
	p ->next = q->next;
	return 0;
	
	
}

//
//int InsertLinkNodeHead(LinkNode &L,ElemType e){
//	pass 
//}
//
//
//int InsertLinkNodeTail(LinkNode &L,ElemType e){
//	pass
//}





int main(){
	LinkNode L;
	InitLinkList(L);
	ListEmpty(L);
	for (int i=0;i<=10;i++){
		InsertLinkNode(L,i+1,i);
	}
	InsertLinkNode(L,8,22);
	DeleteLinkNode(L,1);
	DeleteLinkNode(L,10);

	ForData(L);
	GetElem_Data(L,0);
	return 0;
}  

頭插法尾插法未完成下週更新完。