using System;

abstract class Animal {
  public abstract string Name { get; }
  public abstract void WhoAreYou();
  public abstract bool Likes(string food);
  public abstract void Speak();
}

class Dog : Animal {
  private string name;
  
  public Dog(string name) {
    this.name = name;
  }
  
  public override string Name {
    get { return name; }
  }
  
  public override void WhoAreYou() {
    Console.WriteLine("I am a dog");
  }
  
  public override bool Likes(string food) { 
    return food == "bones" || food == "meat";
  }
  
  public override void Speak() {
    Console.WriteLine("Wooff");
  }
  
  public override string ToString() {
    return "dog " + name;
  }
  
  public override bool Equals(object obj) {
    Dog other = (Dog)obj;
    return name == other.name;
  }
  
  public override int GetHashCode() {
    int res = 0;
    foreach (char ch in name) res = res ^ ch;
    return res;
  }
  
  public Dog ShallowCopy() {
    return (Dog)MemberwiseClone();
  }
}

class Test {
  
  public static void Main() {
    Dog lupo = new Dog("lupo");
    Dog clone = lupo.ShallowCopy();
    if (lupo.Equals(clone))
      Console.WriteLine(lupo + " has the code " + lupo.GetHashCode());
  }
}