struct Book{
    long num;    //登录号
    char name[20];   //书名
    char author[20];
    char classNum[20];
    char PC[20];  //出版单位   5798156
    char time[10];  //出版时间
    char price[10];  //价格
    struct Book *next;
}Book;
struct Book *FindByName(struct Book *head)
{   
    struct Book *pr = head,*p = NULL;   
    char a[20];
    int flag=0;
    if(head == NULL)   //链表为空
    {
        printf("数据库没有图书!\n");
        return head;
    }
       else
       {
           printf("请输入要查找的书名：\n");
           scanf("%s",a);
           while(pr != NULL)
           {
               while((strcmp(a,pr->name)!=0)&&(pr->next!=NULL))
               {
                   p = pr;                     //   出错点
                   pr = pr->next;
               }
               if( strcmp(a,p->name)==0)//找到节点
               {
                printf("2. if\n");
                   flag++;
                   printf("***********************************************************************\n");
                   printf("%d. ",flag);
                   printf("登录号：%d\n",p->num);
                   printf("书名：%s\n",p->name);   
                   printf("作者：%s\n",p->author);
                   printf("分类号：%s\n",p->classNum);
                   printf("出版单位：%s\n",p->PC);
                   printf("出版时间：%s\n",p->time);
                   printf("价格：%s\n",p->price);   
               }
               else
               {
                   break;
               }
               pr = pr->next;            
           }
           if(flag==0)
               printf("没有找到该图书!\n");
       }
       return head;
}

输入书名时的a～～～