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

namespace ConsoleAppTestDemo1
{
    class TestDemo1
    {
        static void Main(string[] args)
        {
            Calculator c = new Calculator();
            int r = 0;
            Console.WriteLine("int MaxValue : {0}", int.MaxValue);

            try
            {
                r = c.Add(args[0], args[1]);
            }
            catch(IndexOutOfRangeException e)
            {
                Console.WriteLine("IndexOutOfRangeException ...");
                Console.WriteLine(e.Message);
                Console.WriteLine(e.StackTrace);
            }
            catch (OverflowException oe)
            {
                Console.WriteLine("OverflowException ...");
                Console.WriteLine(oe.Message);
                Console.WriteLine(oe.StackTrace);
            }
            catch (Exception e)
            {
                Console.WriteLine("Exception ...");
                Console.WriteLine(e.Message);
                Console.WriteLine(e.StackTrace);
            }
            Console.WriteLine(r);
        }

    }

    class Calculator
    {
        public int Add(string arg1, string arg2)
        {
            int a = 0;
            int b = 0;
            int result = 0;
            bool hasError = false;

            try
            {
                a = int.Parse(arg1);
                b = int.Parse(arg2);
                result = checked(a + b);
            }
            catch (ArgumentNullException ane)
            {
                Console.WriteLine("ArgumentNullException ...");
                Console.WriteLine(ane.Message);
                Console.WriteLine(ane.StackTrace);
                hasError = true;
            }
            catch (FormatException fe)
            {
                Console.WriteLine("FormatException ...");
                Console.WriteLine(fe.Message);
                Console.WriteLine(fe.StackTrace);
                hasError = true;
            }
            catch (OverflowException oe)
            {
                hasError = true;
                throw oe;
            }
            catch (Exception e)
            {
                hasError = true;
                throw e;
            }
            finally
            {
                if (hasError)
                {
                    Console.WriteLine("Exception has error!");
                }
                else
                {
                    Console.WriteLine("Done!");
                }
            }

            return result;
        }
    }
}