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

namespace CSharpExceptionHandling
{
    class Program
    {

        public void Run()
        {
            try
            {
                double a;
                double b;

                System.Console.WriteLine
                    ("Please Enter A Number: ");
                a = double.Parse(Console.ReadLine());

                System.Console.WriteLine
                    ("Please Enter Another Number: ");
                b = double.Parse(Console.ReadLine());

                Console.WriteLine("Dividing {0} by {1}...", a, b);

                //The method doDivide throws two tyoes of exceptions:
                //- DivideByZeroException: Thrown if the user enters 0 as the second number (Number can't be divided by 0)
                //- ArithmeticException: Thrown if the user enters 0 as the first number
                Console.WriteLine("{0} / {1} = {2}",
                    a, b, doDivide(a, b));
            }

                // Most derived exception type first
            catch (System.DivideByZeroException e)
            {
                Console.WriteLine(
                    "\nDivideByZeroException! Msg: {0}",
                    e.Message);
            }

            catch (System.ArithmeticException e)
            {
                Console.WriteLine(
                    "\nArithmeticException! Msg: {0}",
                    e.Message);
            }

                // Generic exception type last
            catch
            {
                Console.WriteLine(
                    "Unknown exception caught");
            }
            finally
            {
                //This block IS ALWAYS Executed
                Console.WriteLine("'finally' block is always executed. Close file here.");
            }
        }

        // Do the division if legal
        public double doDivide(double a, double b)
        {
            if (b == 0)
                throw new System.DivideByZeroException();
            if (a == 0)
                throw new System.ArithmeticException();
            return a / b;
        }


        static void Main()
        {
            Console.WriteLine("Enter Main...");
            Program t = new Program();
            t.Run();
            Console.WriteLine("Exit Main...");
            Console.ReadLine();
        }

    }
}