nbsp; for (i=0; i<4; i++)
   sum[i]=0;
 }
 int push_cat(Cat &cat, int n)
 {
  cats[n] = cat;  
  if (cage[n]!=NONE) return 0;
  else {
   sum[0]++;
   return cage[n]=CAT;
  }
 }
 int push_dog(Dog &dog, int n)
 {
  dogs[n]=dog;  
  if (cage[n]!=NONE) return 0;
  else{
   sum[1]++;
   return cage[n]=DOG;
  }
 }
 int push_snake(Snake &snake, int n)
 {  
  snakes[n]=snake;  
  if (cage[n]!=NONE) return 0;
  else {
   sum[2]++;
   return cage[n]=SNAKE;
  }
 }
 void del(int n)
 {
  if (cage[n]==CAT) sum[0]--;
  if (cage[n]==DOG) sum[1]--;
  if (cage[n]==SNAKE) sum[2]--;
  if (cage[n]==NONE)
   cout<<"笼子里没有动物"<<endl;
  else
  { 
   cage[n]=NONE;
   cout<<"已删除笼子里的动物"<<endl;
  }  
  cout<<endl;
 }
 void seek(int n)
 {
  if (cage[n]==NONE) cout<<"第"<<n<<"个笼子里没有动物"<<endl;
  if (cage[n]==CAT)
  {
   cout<<"第"<<n<<"个笼子里的动物为猫,";
   cats[n].ShowMe();
  }
  if (cage[n]==DOG)
  {
   cout<<"第"<<n<<"个笼子里的动物为狗,";
   dogs[n].ShowMe();
  }
  if (cage[n]==SNAKE)
  {
   cout<<"第"<<n<<"个笼子里的动物为蛇,";   
   snakes[n].ShowMe();
  }
  cout<<endl;  
 }
 void count()
 {  
  cout<<"笼子里的猫总共有："<<sum[0]<<"只"<<endl;
  cout<<"笼子里的狗总共有："<<sum[1]<<"只"<<endl;
  cout<<"笼子里的蛇总共有："<<sum[2]<<"只"<<endl;
  cout<<endl;
 }
};
void main()
{
 char c;
 Cat cat;
 Dog dog;
 Snake snake;
 Shelves shelves;
 int i=1,j;
 cout<<"这是关于往笼子里放动物的问题: "<<endl;
 cout<<endl;
  cout<<" 1: 往笼子里放猫；"<<endl;
  cout<<" 2: 往笼子里放狗；"<<endl;
  cout<<" 3: 往笼子里放蛇；"<<endl;
  cout<<" 4: 查询笼子里的动物；"<<endl;
  cout<<" 5: 删除笼子里的动物；"<<endl;
  cout&l

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