数据存储的链表操作

链表实现数据的存储，解决数组存储数据的不便利性

实例代码如下：

/* films2.c -- 使用结构链接表 */
#include <stdio.h>
#include <stdlib.h>			/* 提供malloc()原型 */
#include <string.h>			/* 提供strcpy()原型 */
#define TSIZE 45			/* 存放片名的数组大小 */
struct film
{
	char title[TSIZE];
	int rating;
	struct film *next;		/* 指向链表的下一个结构 */
};

int main(void)
{
	struct film *head = NULL;
	struct film *prev, *current;
	char input[TSIZE];

	/* 手机并存数信息 */
	puts("Enter first movie title: ");
	while(gets(input) != NULL && input[0] != '\0')
	{
		current  = (struct film *) malloc(sizeof(struct film));
		if(head == NULL)	/* 第一个结构 */
		{
			head = current;
		}
		else				/* 后续结构 */
		{
			prev->next = current;
		}
		current->next = NULL;
		strcpy(current->title, input);
		puts("Enter your rating <0-10>: ");
		scanf("%d", &current->rating);
		while(getchar() != '\n')
		{
			continue;
		}
		puts("Enter next movie title (empty line to stop)");
		prev = current;
	}

	/* 给出电影的列表 */
	if(head == NULL)
	{
		printf("No data entered. ");
	}
	else
	{
		printf("Here is the movie list :\n");
	}

	current = head;
	while(current != NULL)
	{
		printf("Movie: %s Rating: %d\n",current->title,current->rating);
		current = current->next;
	}
	/* 任务完成，因此释放所分配的内存 */
	current = head;
	while(current != NULL)
	{
		free(current);
		current = current->next;
	}
	printf("Bye!\n");
}