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#include <stdio.h>
#include <stdlib.h>
#include <string.h>int main(void){
struct film{char name[20];int id;struct film *pre;        //前向指针struct film *next;       //后向指针
};struct film *head=NULL;struct film *ls,*lspre,*work;int i=0;char input[20];while(i<3){puts("输入姓名：");fgets(input,20,stdin);work=(struct film*)malloc( sizeof(struct film));if(head==NULL){lspre=NULL;head=work;}elsels->next=work;work->next=NULL;work->pre=lspre;strcpy(work->name,input);work->id=i;i++;ls=work;lspre=work;}//--------删除id=1 项--------------------------work=head;while(work!=NULL){if((work->id)==1){((work->pre)->next)=work->next;   //后向指针(work->next)->pre=work->pre;      //前向指针} work=work->next;}//--------利用pre反向显示--------------------------	work=lspre;while(work!=NULL){printf("%d %s\n",work->id,work->name);  work=work->pre;}//-------链表遍历---------------------------------------------------work=head;while(work!=NULL){
//		printf("name:%s  id:%d\n",work->name,work->id );work=work->next;}//--------释放全部malloc------------------------------work=head;while(work!=NULL){	ls=work->next;       	free(work);work=ls;}return 0;
}