#include<stdio.h>
#include<malloc.h>
#define NULL 0
#define LEN sizeof(struct people)
struct people
{char id[20];
 char name[20];
 char sex[10];
 int birth;
 struct people *next;
};
int n;
struct people *creat(void)
{struct people *head;
 struct people *p1,*p2;
 n=0;
 p1=p2=(struct people *)malloc(LEN);
 scanf("%s%s%s%d",p1->id,p1->name,p1->sex,&p1->birth);
 head=NULL;
 while(p1->id!=0)
 {n=n+1;
  if(n==1)head=p1;
  else p2->next=p1;
  p2=p1;
  p1=(struct people *)malloc(LEN);
  scanf("%s%s%s%d",p1->id,p1->name,p1->sex,&p1->birth);
 }
 p2->next=NULL;
 return(head);
}
void print(struct people *head)
{struct people *p;
 printf("these %d records are:\n",n);
 p=head;
 if(head!=NULL)
     do
     {printf("%s %s %s %d",p->id,p->name,p->sex,p->birth);
         p=p->next;
     }while(p!=NULL);
}
void main()
{struct people *head;
printf("please input records:\n");
head=creat();
print(head);
}