老师叫我们做一个链表的综合操作实例 作业 根据课本中的
#include<malloc.h>
#define NULL 0
#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 *)maollc(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);
}
void print(struct student *head)
{    struct student *p;
    printf("\nNow,These %d records are:\n",n);
    p=head;
    if(head!=NULL)
    do
         {printf("%ld%5.1f\n",p->num,p->score);
          p=p->next;
         }
         while(p!=NULL);
}
struct student *del(struct student *head,long num)
{
    struct student *p1,*p2;
    if(head==NULL)
        {printf("\nlist null!\n");
        goto end;
        }
    p1=head;
    while(num!=p1->num && p1->next!= NULL)
    {p2=p1;p1=p1->next;}
    if(num == p1->num)
        {
        if(p1==head) head=p1->next;
        else p2->next=p1->next;
        printf("delete:%d\n",num);
        n=n-1;
           }
else printf("delte:\%ld",num);
return(head);
}
struct student * insert(struct student *head,struct student *stud)
    {struct student *p0,*p1,*p2;
    p1=head;
    p0=stud;
    if(head==NULL)
    {head=p0;p0->next=NULL;}
    else
    {while((p0->num>p1->num)&&(p1->next!=NULL))
     {
     p2=p1;
     p1=p1->next;
     }
       if(p0->num<=p1->num)
         {if(head==p1) head=p0;
         else p2->next=p0;
         p0->next=p1;}
     else
   {p1->next=p0;p0->next=NULL;}}
   n=n=1;
   return(head);
   main()
      {struct student *head,stu;
      long del_num;
      printf("input records:\n");
      head=creat();
      print(head);
      printf("\ninput the deleted number:");
      scanf("%ld",&del_num);
      head=del(head,del_num);
      print(head);
      printf("\ninput the inserted record:");
      scanf("%ld,%f",&stu.num,&stu.score);
      head=insert(head,&str);
      print(head);
      } 我就把这些写下来 不知道怎么组合起来