using System;

using static System.Console;

using System.Globalization;

class SubscriptExceptionTest

{

    static void Main()

    {

        double[] nums = {15, 30, 45, 60, 2, 4, 6, 8, 9, 10};

        const double QUIT = 99;

        int input = 0;

        while(input != QUIT)

        {

            try

            {           

                WriteLine("Enter index number or 99 to quit >> ");

                input = Convert.ToInt32(ReadLine());

                if(input == QUIT)

                    WriteLine("Thanks!");

                WriteLine(nums[input]);

            }

            catch(IndexOutOfRangeException)

            {

                if(input !=QUIT)

                    WriteLine("Index was outside the bounds of the array.");

            }

        }

    }

}