using System;

public class Program

{

    class Circle{

        int radius;

        // Citire 

        public void ReadCircleInfo(){

            Console.WriteLine("Citirea circului.");

            Console.WriteLine("Introduces lungimea razei (numarul natural)");

            Console.Write("lungimea razei = ");

            // nu facem validare, presupunem că utilizatorul va introduce o valoare validă          

            string rawInputValue = Console.ReadLine();

            radius = Convert.ToInt32(rawInputValue);

        }

        // Afisare

        public void PrintCircleInfo(){

            Console.WriteLine("\n===========================");         

            Console.WriteLine("Afisare circului");

            Console.WriteLine("Lungimea razei: " + radius);

            Console.WriteLine("Diametrul: " + Math.Round(GetDiameter(), 2));

            Console.WriteLine("Lungimea discului: " + Math.Round(GetCircleLength(), 2));

            Console.WriteLine("Suprafata: " + Math.Round(GetArea(), 2));            

            Console.WriteLine("===========================");                       

            Console.WriteLine();

        }

        // determinarea lungimii dicului

        public double GetCircleLength(){

            // L = 2 x PI x R

            return 2 * radius * Math.PI;

        }

        // dimatrul

        public double GetDiameter(){

            // D = 2 x R

            return 2 * radius;

        }

        // suprafata

        public double GetArea(){

            // S = PI x R^2

            return Math.PI * radius * radius;

        }

    }

    public static void Main()

    {

        Circle circle = new Circle();

        circle.ReadCircleInfo();

        circle.PrintCircleInfo();

    }

}