struct student *inser(struct student *head,struct student *student)
{
    struct student *p0,*p1,*p2;//p0 为要插入的 指针， p2表示什么？
    p1=head;
    p0=stud;
    if(head==NULL)
    {
        head=p0;
        po=next->=NULL;
        }
        else
        {
            while((p0->num>pl->num)&&(p1->next!=NULL))
            {
                p2=p1;
                p1=p1->next;//while判断是找到比被插入结点值大的点，  括号里这两句是做什么的，前面不是没有用到p2，这里怎么突然用到了
                }
                if(p0->num<=p1->num)//这一句是说找到比被插入结点值小的点吧？
                {
                    if(head==p1)
                        head=p0;
                    else
                        p2->next=p0
                    p0->next=p1;
                    }
                    else
                    {
                        p1->next=p0;//
                        p0->next=NULL;
                        }
                        n=n+1;
                        return head;
            }
    }

[ 本帖最后由 NeQhk 于 2015-1-19 17:29 编辑 ]