链表内冒泡排序问题，c语言版

Question

死循环了，不懂为什么，求哥哥姐姐们指教！我是新手，莫怪---

 struct student *sort(struct student *head)
{


    if(!head)
    {
        goto END;
    }
    struct student *min,*p,*end;
    struct student temp;
    for(min = head;min != NULL;min = min->next)
    {
        end = min;
    }
    for(min = head;min != NULL;min = min->next)
    {
        for(p = head;p != end;p = p->next)
        {
            printf("123");
            if(min->num > p->num)
            {
                temp = *min;
                *min = *p;
                *p = temp;
                printf("paixu\n");
            }
        }

    }

END:
    return head;

}

Answer 1

看看。。。。。。。。。。。。。。。。。。。。。。。。。。。