下拉菜单与图书源程序S_BOOK4.C

/*******************************************************/
/*        函数功能：结点删除                           */
/*        输入参数：链表头指针                         */
/*        函数输出：返回链表头指针                     */
/*******************************************************/
 struct node *del(struct node *head)
 {
  char sn[15],s;
  int m=0;
  struct node *p,*q;
  window(3,3,40,20);
  gotoxy(3,m++);
  cprintf("Please input book name\n");
  gotoxy(3,m++);
  cprintf("\nname:");scanf("%s",sn);
  p=head;
  while((p!=NULL) && (strcmp(p->name,sn)!=0))
   { q=p;p=p->link;}
  if(strcmp(p->name,sn)==0)
  {
   gotoxy(3,m++);
   cprintf("           name    price   publshier\n");
   gotoxy(3,m++);
   cprintf("Book Found:  %s      %5.2f    %s\n",p->name,p->price,p->pub);
   gotoxy(3,m++);
   cprintf("Do you want to del this book(y/n)");
   scanf("\n%c",&s);
   if(s=='y' || s=='Y')
   {
     if(p==head)head=p->link;
     else q->link=p->link;
     gotoxy(3,m++);
     cprintf("This book is deleted!\n");
     gotoxy(3,m++);
     cprintf("\n    Press any keys !");getch();
     return head;
   }
   else
     {
        gotoxy(3,m++);
        cprintf("\nThis book not delete!\n");
      }
  }
  else
    {
       gotoxy(3,m++);
       cprintf("NOT found!");
     } 
  gotoxy(3,m++); 
  cprintf("\n    Press any keys!");getch();
  return head;