建立三个学生的单链表试试感觉

#include <stdio.h>

#include <stdlib.h>

#include <malloc.h>

#define LEN sizeof(struct student)

struct student

{

    long num;

    float score;

    struct student*next;

};

int n;

struct student* creat(void)

{

    struct student*head;

    struct student*p1,*p2;

    n = 0;

    p1 = p2 =(struct student*)malloc(LEN);

   scanf("%ld,%f",&p1->num,&p1->score);

    head = NULL;

   while(p1->num!=0&&n<3)

    {

       n=n+1;

       if(n==1) head = p1;

       else p2->next = p1;

       p2 = p1;

       p1 =(struct student *)malloc(LEN);

      scanf("%ld,%f",&p1->num,&p1->score);

    }

    p2->next= NULL;

    return head;

}

int main()

{

    struct student*head,*p;

    p = head =creat();

    while(p!=NULL)

    {

      printf("%ld,%f\n",p->num,p->score);

       p = p->next;

    }

    return 0;

}