链表怎么运行不了

人走茶凉

# include <stdio.h>
# include <malloc.h>
# define LEN sizeof(struct Student)
struct Student
{
long num;
float socre;
struct Student * next;
};
int n;//定义全局变量n,n是结点个数
struct Student * creat()//建立链表函数
{
struct Student * head;
struct Student *p1,*p2;
n = 0;
p1 = p2 = (struct Student *)malloc(LEN);
scanf("%ld,%f",p1->num ,p1->socre );
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->socre );
}
p2->next = NULL;
return (head);
}
void print(struct Student * head)//输出链表函数
{
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->socre );
   p = p->next;
  }while(p != NULL);
}
int main()
{
struct Student * head;
head = creat();
print( head);
return 0;
}







//一运行就应用程序错误，

牡丹花下死做鬼

# include <stdio.h>
# include <malloc.h>
# define LEN sizeof(struct Student)
struct Student
{
        long num;
        float socre;
        struct Student * next;
};

int n;//定义全局变量n,n是结点个数

struct Student * creat()//建立链表函数
{
        //struct Student * head;
        struct Student * he;
        struct Student *p1,*p2;
        n = 0;
        p1 = p2 = (struct Student *)malloc(LEN);
        //scanf("%ld,%f",p1->num ,p1->socre );
        scanf("%ld,%f",&p1->num ,&p1->socre );
        he = 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->socre );
                */
                if(n == 1)
                {
                        he = p1;
                }
                else
                {
                        p2 = (struct Student *)malloc(LEN);
                        p1->next = p2;
                        scanf("%ld,%f",&p2->num ,&p2->socre );
                        p1 = p2;
                }
        }
        //p2->next = NULL;
        p1->next  = NULL;
        return (he);
}
void print(struct Student * head)//输出链表函数
{
        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->socre );
                        p = p->next; 
                }while(p != NULL);
}
int main()
{
        struct Student * head;
        head = creat();
        print( head);
        return 0;
}

人走茶凉

牡丹花下死做鬼 发表于 2014-9-27 09:24

谢谢了，发现问题了，我这里scanf("%ld,%f",p1->num ,p1->socre );
后面少了2个位取于符号，但是很奇怪，居然编译没提示错误，