cpp/C5/P9/c9-9.c

#include <stdio.h>
#include <stdlib.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=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 *pt;
  pt=creat();                                                // 函数返回链表第一个结点的地址 
  printf("\nnum:%ld\nscore:%5.1f\n",pt->num,pt->score);      // 输出第一个结点的成员值
  return 0;
};