//from the book "Practical Object-Oriented Design in Ruby" by Sandi Metz
namespace POODR_Example
{
    public class Gear
    {
        private int chainring, cog, rim; //data fields
        private double tire;

        public Gear (int chainring, int cog, int rim, double tire) //constructor
        {
            this.chainring = chainring;
            this.cog = cog;
            this.rim = rim;
            this.tire = tire;
        }

        public int GetGearInches () //public accessor method
        {
            return GetRatio() * new Wheel(rim, tire).GetDiameter();
        }

        private int GetRatio () //private helper method
        {
            return chainring / cog;
        }
    }

    public class Wheel
    {
        private int rim; //data fields
        private double tire;

        public Wheel (int rim, double tire) //constructor
        {
            this.rim = rim;
            this.tire = tire;
        }

        public int GetDiameter () //public accessor method
        {
            return rim * (int)(tire * 2);
        }
    }
}