创建动态单链表

#include <stdio.h>
#include<string.h>
#include<stdlib.h>

struct Student
{
 long num;
 float score;
 struct Student* next;
};
int n;

struct Student* creat(void)//构造一个函数，函数返回值为指针，该指针是指向结构体类型
{
 struct Student* head;
 struct Student *p1,*p2;// 定义三个结构体指针
 n = 0;
 p1=p2 = (struct Student*)malloc(sizeof(struct Student));//给p1和p2创建一个结构体容量的内存空间
 scanf("%d,%f", &(*p1).num, &(*p1).score);//输入p1所指结构体内各元素值
 head = NULL;//赋值HEAD为空指针
 while (p1->num != 0)//判断p1指向的结点内number元素是否为0
 {
  n = n + 1;//n的值加1
  if (n == 1) head = p1;//head指向第一个结点
  else p2->next = p1;//如果n的值不为1，则使p2所指的结构体内next指针指向p1.
  p2 = p1;//把p1赋值给p2,即使p2指针向前移动到p1.
  p1 = (struct Student*)malloc(sizeof (struct Student));//继续给p1开辟空间
  scanf("%d,%f", &p1->num, &p1->score);//输入p1指向的新结点值。
  //scanf("%d,%f ", &p1->num, &p1->score);//此处需要特别注意多一个 需要多一行。在这卡了很久。
 }
 p2->next = NULL;//当p1所指结点中number元素为0时，赋值p2->next为空。
 return(head);//返回头指针
}

/*struct Student*creat(void)
{
 struct Student *head;
 struct Student *p1, *p2;
 n = 0;
 p1 = p2 = (struct Student*)malloc(sizeof (struct Student));
 scanf("%d,%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(sizeof (struct Student));
  scanf("%d,%f", &p1->num, &p1->score);
 }
 p2->next = NULL;
 return(head);
}*/
/*void printing(struct Student *head)
{
struct Student *p;
p = head;
if (head != NULL)
do
{
printf("%1d%5.1f ", p->number, p->mark);
p=p->next;
} while (p != NULL);
}*/
int main()
{
 struct Student* Creat(void);
 //void printing(struct Student* head);
 struct Student *pt;
 pt = creat();
 printf(" number:%1d mark:%5.1f ", pt->num, pt->score);
 //printing(head);
 return 0;
}