C#继承的用法

using System;
namespace 继承
{
	public class cat
	{
		private string _name = null;
		private int _age = 0;
		
		public cat(string name,int age)
		{
			_name = name;
			_age = age;
			Console.WriteLine();
			Console.Write("猫的名字是{0},年龄为{1},",name,age);
		}
	}

	public class mycat:cat//继承自cat类
	{
		private int _weight;//新增 _weight属性
		public mycat(string name,int age,int weight):base(name,age)
		{
			_weight = weight;
			Console.WriteLine("重量为{0}.",_weight);
			
		}
	}

	class test
	{
		static void Main()
		{
			mycat thecat = new mycat("Tom",10,20);
		}
	}
}