链表创建，打印，插入，删除等操作

链表创建，打印，插入，删除等操作。（谭浩强：《c语言程序设计-v2》）
#include
#include
#include

#define LEN sizeof(struct student) 
struct student
{
  long num;
  float score;
  struct student *next;
};
int n;
// ---- creat chain
struct student *creat_chain(void)
{
   struct student *head = NULL, *p = NULL, *q = NULL; 
   n = 0;
   q = p = (struct student *) malloc(LEN); 
  scanf("%ld, %f", &p->num, &p->score);  // 输入时用逗号隔开
  printf("Num is %d,Score is %5.1f \n", p->num, p->score);
  while (p->num != 0)
  { 
    n=n+1;
    if (n == 1)     head = p;
    else   q->next = p;
  q = p;
   p = (struct student *) malloc(LEN); 
   scanf("%ld, %f", &p->num, &p->score);
   printf("Num is %d,Score is %f \n", p->num, p->score);
  }
 q->next = NULL;
 return (head);
}

//---- print chain
void print_chain(struct student *head)
{
    struct student *p;
    printf("The chain is : \n");
    p = head;
  if (head != NULL)
     do  
    {
       printf("%ld, %5.1f\n", p->num, p->score);
       p = p->next;
    }
   while(p!=NULL);
 }

//----
int main(void)
{
  struct student *head;
   head = creat_chain();
   print_chain(head);
   return 0;
}  

/*--  E  --*/
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