#include<stdio.h>
#include<stdlib.h>
#include<malloc.h>
#define len sizeof(struct student)

struct student
{
    int number;
    char name[20];
    struct student *next;
}
main()
{
    struct student *creat(void);
    void print(struct student *p4);
    struct student *p4,*p3;
    p3=creat();
    print(p3);
}
struct student *creat(void)
{
    struct student *p1,*p2,*p;
    int i=1;
    FILE *fp;
    if((fp=fopen("name2.txt","r")==NULL))
    {
        printf("cannot open");
        exit(0);
    }
   
    p1=(struct student *)malloc(len);
    if((p1=(struct student *)malloc(len)) == NULL)
    {
     printf("不能成功分配存储空间。");
     exit(1);
    }
    else printf("hello");
    fscanf(fp,"%d%s\n",&p1->number,&p1->name);
    p2=p1;
    while(p1->number!=2012210420)
    {
        if(i>1)
        {
            p2->next=p1;
            p2=p1;
        }
        else p=p1;
        i++;
        p1=(struct student *)malloc(len);
        if((p1=(struct student *)malloc(len)) == NULL)
        {
         printf("不能成功分配存储空间。");
         exit(1);
        }
        fscanf(fp,"%d%s\n",&p1->number,&p1->name);//???????????????
    }
    p2->next=NULL;
    free(fp);
    fclose(fp);
    return(p);
}
void print(struct student *p4)
{   
    struct student *p;
    p=p4;
    do
    {
        printf("%d %s\n",p->number,p->name);
        p=p->next;
    }while(p!=NULL);
}

这~~~~~~~~~~~·能具体点吗·？