using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace GeometricFigures

{

    public class Circle

    {

        private int _radius;

​

        public int Radius

        {

            get { return _radius; }

            set

            {

                 if (value < 1)

​

                     throw new ArgumentException("Radius is not integer!");

                _radius = value;

            }

        }

​

        public Circle(int radius)

        {

            Radius = radius;

        }

​

        public double EvaluateSquare(int radius)

        {

            double square = Math.PI * radius * radius;

            return square;

        }

    }

​

    public class InputOutput

    {

        public static void AskForRadius()

        {

            Console.WriteLine("Enter the Radius for your circle:");

        }

​

       /* public static int CheckValue()

        {

            int radius;

            if (int.TryParse(Console.ReadLine(), out radius))

                return radius;

​

            return -1;

        }*/

    }

​

    public class Program

    {

        public static void Main(string[] args)

        {

            InputOutput.AskForRadius();

            //int radius = InputOutput.CheckValue();

            Circle firstCirle = new Circle(15);

            Console.WriteLine(firstCirle.Radius);

            double result = firstCirle.EvaluateSquare(firstCirle.Radius);

            Console.WriteLine(result);

        }

    }

}

​

​