namespace CatAnDog
{
abstract  class   Animal
 {
        public  abstract void Shout();
        public void Walk()
{
   Console.WriteLine(“动物走路！”);
}
      }
      class Cat:Animal
      {
         public  override void Shout()
         {
            Console.WriteLine(“我是小猫喵喵叫！”);
} 
}
class Dog:Animal
{
   public  override void Shout()
   {
      Console.WriteLine(“我是小狗汪汪叫！”);
}
}
class Program
{
   static  void Main(string[] args)
{
       Animal animal;
       animal=new Cat();
       animal.Shout();
animal.Walk();
       animal=new Dog();
       animal.Shout();
animal.Walk();
}
}
}