using System;

namespace MobilePhoneDevice
{
    internal class GSM
    {
        private string model;
        private string manufacturer;
        private Battery battery;

        public GSM(string model, string manufacturer, Battery battery)
        {
            this.Model = model;
            this.Manufacturer = manufacturer;
            this.Battery = battery;
        }
        public string Model
        {
            get
            {
                return this.model;
            }
            set
            {
                this.model = value;
            }
        }

        public string Manufacturer
        {
            get
            {
                return this.manufacturer;
            }
            set
            {
                this.manufacturer = value;
            }
        }

        public Battery Battery
        {
            get
            {
                return this.battery;
            }
            set
            {
                //if (this.battery.HoursIdle < 0)
                //{
                //    throw new IndexOutOfRangeException("Hours idle cant be a negative number");
                //}
                this.battery = value;
            }
        }
    }

    class Battery
    {
        private int hoursIdle;
        public Battery(int hoursIdle)
        {
            this.HoursIdle = hoursIdle;
        }

        public int HoursIdle
        {
            get
            {
                return this.hoursIdle;
            }
            set
            {
                if (value < 0)
                {
                    throw new IndexOutOfRangeException("Hours idle cant be a negative number");
                }
                this.hoursIdle = value;
            }
        }
    }

    public class MobilePhoneDevice
    {
        static void Main()
        {
            GSM asdf = new GSM("3310", "Nokia", new Battery(-1));
        }
    }
}