C语言实现单链表的基本操作

内容介绍：这个博客只有代码实现，没有逻辑解释

链表结点

typedef struct node{
	int data;
	struct node *next;
}LNode, *LinkedList;

1.数据的两中插入方式

1>头插法

LinkedList headInsert(LinkedList *L){
	LinkedList p,s;
	(*L) = s = (LinkedList)malloc(sizeof(LNode));
	s->next = NULL;
	int num;
	scanf("%d", &num);
	while(num != -1){
		p = (LinkedList)malloc(sizeof(LNode));
		p->data = num;
		p->next = s->next;
		s->next = p;
		scanf("%d", &num);
	}
	return s;
}

2>尾插法

LinkedList tailInsert(LinkedList *L){
	LinkedList p,s;
	int num;
	(*L) = s = (LinkedList)malloc(sizeof(LNode)); 
	s->next = NULL;
	scanf("%d", &num);
	while(num != -1){
		p = (LinkedList)malloc(sizeof(LNode));
		p->data = num;
		p->next = NULL;
		s->next = p;
		s = p;
		scanf("%d", &num);
	}
	return (*L);
} 

2.增(给第k给结点之后增加一个值为x的结点)

void  add(LinkedList L, int k, int x){
	int num;
	LinkedList p,s;
	p = L->next;
	for(int i=1; i<k; i++){
		p = p->next;
	} 
	s = (LinkedList)malloc(sizeof(LNode));
	s->data = x;
	s->next = p->next;
	p->next = s;
}

3.删（删除第k个结点）

void deleteK(LinkedList L, int k){
	LinkedList p,q;
	p = L->next;
	for(int i=1; i<k-1; i++){
		p = p->next;
	}
	q = p->next;
	p->next = q->next;
	free(q);
} 

4.改（更改第k个结点的值为x）

void update(LinkedList L, int k, int x){
	LinkedList p = L->next;
	for(int i=1; i<k; i++){
		p = p->next;
	}
	p->data = x;
} 

5.查（查询第k个结点的值 ）

int getK(LinkedList L, int k){
	LinkedList p = L->next;
	for(int i=1; i<k; i++){
		p = p->next;
	} 
	return p->data;
}

完整代码：

#include
#include
#include
 
typedef struct node{
	int data;
	struct node *next;
}LNode,*LinkedList;

//头插法 
LinkedList headInsert(LinkedList *L){
	LinkedList p,s;
	(*L) = s = (LinkedList)malloc(sizeof(LNode));
	s->next = NULL;
	int num;
	scanf("%d", &num);
	while(num != -1){
		p = (LinkedList)malloc(sizeof(LNode));
		p->data = num;
		p->next = s->next;
		s->next = p;
		scanf("%d", &num);
	}
	return s;
}

//尾插法
LinkedList tailInsert(LinkedList *L){
	LinkedList p,s;
	int num;
	(*L) = s = (LinkedList)malloc(sizeof(LNode)); 
	s->next = NULL;
	scanf("%d", &num);
	while(num != -1){
		p = (LinkedList)malloc(sizeof(LNode));
		p->data = num;
		p->next = NULL;
		s->next = p;
		s = p;
		scanf("%d", &num);
	}
	return (*L);
} 

//给第k给结点之后增加一个值x
void  add(LinkedList L, int k, int x){
	int num;
	LinkedList p,s;
	p = L->next;
	for(int i=1; i<k; i++){
		p = p->next;
	} 
	s = (LinkedList)malloc(sizeof(LNode));
	s->data = x;
	s->next = p->next;
	p->next = s;
}

//删除第k个结点
void deleteK(LinkedList L, int k){
	LinkedList p,q;
	p = L->next;
	for(int i=1; i<k-1; i++){
		p = p->next;
	}
	q = p->next;
	p->next = q->next;
	free(q);
} 

//更改第k个结点的值为x
void update(LinkedList L, int k, int x){
	LinkedList p = L->next;
	for(int i=1; i<k; i++){
		p = p->next;
	}
	p->data = x;
} 

//查询第k个结点的值 
int getK(LinkedList L, int k){
	LinkedList p = L->next;
	for(int i=1; i<k; i++){
		p = p->next;
	} 
	return p->data;
}

//输出链表所有值 
void print(LinkedList L){
	LinkedList p = L->next;
	while(p){
		printf("%d\t", p->data);
		p = p->next;
	}
	printf("\n");
}

//主函数 
int main(){
	LinkedList head = NULL;

//	头插	
	head = headInsert(&head);
//	尾插 
	head = tailInsert(&head);
	print(head);
	
//	增
	add(head, 3, 4);
	print(head);
	
//	删 
	deleteK(head, 4);
	print(head); 
	
//  改	
	update(head, 4, 4);
	print(head);
	
//  查	
	int num = getK(head, 3);
	printf("%d",num);
}