2018-10-25作业一

using System;

 using System.Collections.Generic;

using System.Linq; using System.Text;

namespace ConsoleApplication1

 { class Program

 { static void Main(string[] args)

{ double r = 5;

 double pi = 3.14;

double s=pi*r*r ;

double c=pi*r *2;

 Console.WriteLine("面积是{0}周长是{1}", s, c);

Console.ReadKey ();

}

 }

}