using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { class MyMath { static void Main(string[] args) { double pi = 3.14; string num=Console.ReadLine(); double r = System.Convert.ToDouble(num); Console.WriteLine("圆周长为:{0}",2 * pi * r); Console.WriteLine("圆面积为:{0}",pi * r * r); Console.WriteLine("球体积为:{0}",4 * pi * r * r); } } }