t;<" 6：统计笼子里的动物种类及数量；"<<endl;
  cout<<" 7: 退出程序;"<<endl;
  cout<<"------------------------------------------"<<endl;
 while(i)
 {
  cout<<"请选择您的*作：";
  cin>>i;
  switch(i)
  {
  case 1:
   cout<<" 往哪只笼子里面放: ";
   cin>>j;
   cin>>cat;    
   while (shelves.push_cat(cat, j)==0)
   {
    cout<<" 笼子里已有动物，请换一个笼子: ";
    cin>>j;
   }
   break;
  case 2:
   cout<<" 往哪只笼子里面放: ";
   cin>>j;
   cin>>dog;    
   while (shelves.push_dog(dog, j)==0)
   {
    cout<<" 笼子里已有动物，请换一个笼子: ";
    cin>>j;
   }
   break;
  case 3:
   cout<<" 往哪只笼子里面放: ";
   cin>>j;
   cin>>snake;    
   while (shelves.push_snake(snake, j)==0)
   {
    cout<<" 笼子里已有动物，请换一个笼子: ";
    cin>>j;
   }
   break;
  case 4: 
   cout<<" 查询哪只笼子: ";
   cin>>j;
   shelves.seek(j);
   break;
  case 5: 
   cout<<" 删除哪只笼子里的动物: ";
   cin>>j;
   shelves.del(j); break;
  case 6:
   shelves.count(); break;
  default: i=0; break;
  }
  cout<<endl;
 }
}

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