继承（猫继承动物）

namespace CatClass
{
public class Animal
{
public Animal()
{
Console.WriteLine("Hello,Animal!");
}
public Animal(string name)
{
Console.WriteLine("Hello,My name is "+name +"!");
}
public void Eat()
{
Console.WriteLine("Eating ");
}
}
public class Cat : Animal
{
public Cat()
{
Console.WriteLine("Hello,Cat");
}
}
class Program
{
static void Main(string[] args)
{
Cat e = new Cat();
Animal ys = new Animal("ys");
e.Eat();
Console.ReadLine();
}
}
}