public static void Main()
Console.Write("Input radius : ");
double radius = double.Parse(Console.ReadLine());
Console.WriteLine("----------------------------------");
double area = Math.PI*(radius*radius);
Console.WriteLine("Circle area = {0:f3}",area);
double ccf = Math.PI*2*radius;
Console.WriteLine("Circumference = {0:f3}",ccf);
double vr = (4.0/3)*(Math.PI*radius*radius*radius);
Console.WriteLine("Volumn round = {0:f3}",vr);