C实例 创建一个简单的链表

#include <stdio.h>

#include <stdlib.h>



struct node {

   int data;

   struct node *next;

};



struct node *head = NULL;

struct node *current = NULL;



//display the list

void printList() {



   struct node *ptr = head;



   printf("\n[head] =>");

   //start from the beginning

   while(ptr != NULL) {        

      printf(" %d =>",ptr->data);

      ptr = ptr->next;

   }



   printf(" [null]\n");

}



//insert link at the first location

void insert(int data) {

   //create a link

   struct node *link = (struct node*) malloc(sizeof(struct node));



   //link->key = key;

   link->data = data;



   //point it to old first node

   link->next = head;



   //point first to new first node

   head = link;

}



int main() {

   insert(10);

   insert(20);

   insert(30);

   insert(1);

   insert(40);

   insert(56);



   printList();

   return 0;

}