using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 继承
{
class Program
{
static void Main(string[] args)
{
chinese p1=new chinese();
p1.name="陈一姐";
p1.sayhello();
p1.户口="fujian";
p1.gongfu();
person c1 = p1;//这是合理地
c1.sayhello();
// chinese c2 = new person();//这是错误的
// chinese c2 = c1;//这是错误的
chinese c2 = (chinese)c1;//保证p1一定是中国人，由程序员强行转换
c2.sayhello();
object c3 = p1;//object是所有类的基类，
c3.sayhello();//父类中没有这个函数

Console.ReadKey();
}
}
class person:Object//所有的类都是基于object类，可以不写
{
public string name { set; get; }
public int age { set; get; }
public void sayhello()
{
Console.WriteLine("{0}", this.name);
}

}
class chinese : person
{
public string 户口 { get; set; }
public void gongfu()
{
Console.WriteLine("我打");
}
}
}