编写一个C#程序.

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

namespace ConsoleApplication1
{
class Program
{
public class Circle//Circle类
{
public Circle(double r)//构造函数，用来获取半径值
{
this.Radius = r;
}
private double _Radius;//半径
public double Radius
{
get { return _Radius; }
set { _Radius = value; }
}
}
static void Main(string[] args)
{
Circle c1 = new Circle(2);
Circle c2 = new Circle(10);
Circle c3 = new Circle(8);
Circle c4 = new Circle(4);
Circle c5 = new Circle(12);//实体化的同时，通过调用构造函数给半径赋值
Circle[] circles = new Circle[5] { c1,c2,c3,c4,c5};//定义一个Circle类数组
int [] rs = new in