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 ();
}
}
}
