链表模板（头插模块）

#include<stdio.h>struct node{    int num;    struct node *next;};typedef struct node Node;typedef Node * Link;void init_link(Link *head){    *head = NULL;}void insert_head_node(Link newnode,Link *head){    newnode->next = *head;        *head = newnode;}void display_link(Link head){    Link temp = head;    while(temp != NULL)    {        printf("%d\n",temp->num);temp = temp->next;    }}int main(){    Link head;    Link newnode;    int i;    init_link(&head);    if(head == NULL)    {        printf("head is NULL!\n");    }    for(i = 0; i < 10; i++)    {        newnode = (Link)malloc(sizeof(Node));newnode->num = i+1;insert_head_node(newnode,&head);    }    display_link(head);//(遍历这个链表检查是否插入成功)    return 0;}