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

namespace ChainOfResponsibility
{
    internal class Client
    {
        public static void HowToUse()
        {
            CalcHandler add = new AddHandler();
            CalcHandler sub = new SubtractHandler();
            CalcHandler mul = new MultiplyHandler();
            CalcHandler div = new DivideHandler();

            add.Next = sub;
            sub.Next = mul;
            mul.Next = div;

            int result = add.Calculate(CalcType.Multiply, 10, 20);
            Console.WriteLine(result);
        }
    }
}