using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Task1
{
    class Program
    {
        static Random rnd = new Random();
        static void Main(string[] args)
        {
            int n = 10;
            Action<object, BallEventArgs> logBallError = (s, a) => Console.WriteLine(a.Msg);
            Ball[] ballArr = Enumerable.Range(0, n)
                .Select(x =>
                {
                    var b = new Ball(x);
                    b.RaiseBallError += logBallError;
                    return b;
                })
                .ToArray();

            for (int i = 0; i < ballArr.Length; i++)
            {
                ballArr[i].R = rnd.Next(711) - 5 + rnd.NextDouble();
            }

            Console.Read();

            //Ball ball = new Ball(10);
            //ball.RaiseBallError += (s, a) => Console.WriteLine(a.Msg);
        }
    }

    class BallEventArgs : EventArgs
    {
        public string Msg { get; set; }

        public BallEventArgs(string msg)
        {
            Msg = msg;
        }
    }

    class Ball
    {
        public static double maxR = 500;

        public event Action<object, BallEventArgs> RaiseBallError;

        double r;
        public double R
        {
            get
            {
                return R;
            }

            set
            {
                if (value > maxR || value <= 0)
                {
                    Error($"Boom: Invalid radius = {value}");
                    return;
                }
            }
        }

        public Ball(double r)
        {
            R = r;
        }

        private void Error(string message)
        {
            RaiseBallError?.Invoke(this, new BallEventArgs(message));
        }

    }
}