class Pet
?{
??interface Iclimbtree
??{
???void climbtree();
??}
??interface Icatchmice
??{
???void catchmice();
??}
??public Pet(string name)
??{
???Name = name;
??}
??protected string Name;
??virtual public void printf()
??{
???Console.WriteLine(Name);

??}

??? public class Dog:Pet,Icatchmice,Iclimbtree
??{
???
???public void catchmice()
???{
????Console.WriteLine(" " + Name + "catch");
???}
???public void climbtree()
???{
????Console.WriteLine(" " + Name + "tree");
???}
???public Dog(string name):base(name)
???{
????
???}
???override public void printf()
???{
????Console.WriteLine("mmm" + Name+"lll");

???}
??}
? public class Cat : Pet
??{
???public Cat(string name):base(name)
???{
????
???}
???override public void printf()
???{
????Console.WriteLine("mmm" + Name + "222");

???}
??}

?}
?class Program
?{
??static void Main(string[] args)
??{
???/*Pet dog1 = new Dog();
???dog1.Name = "eat";
???dog1.printf();
???Pet cat1 = new Cat();
???cat1.Name = "drink";
???cat1.printf();*/
???Pet[] pets = new Pet[] { new Dog("aaa"), new Cat("bbb") };
???for(int i=0;i<=pets.Length;i++)
???{
????pets[i].printf();
???}
???Cat cat1 = new Cat("Tom2");
???if(cat1 is Iclimbtree)
???{
????Iclimbtree cat = (Iclimbtree)cat1;
????cat.Iclimbtree();
???}
???

??}
?}