Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

C# C# Basics (Retired) Perfect Final

Evan Krieger
Evan Krieger
341 Points
Posted by Evan Krieger
Evan Krieger
341 Points

Code works without error in workspace, throws argumentNullException when pasting code in answer section

My code works when running it in my workspace, but when I copy and paste it into the answer box of the final, it throws a ArgumentNullException error. What am I missing?

Program.cs 
using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {
          int currentCount = 1;

          while(true)
            {
              Console.Write("Enter the number of times to print \"Yay!\": ");

            try
            {
                var entry = Console.ReadLine();
                var numberEntered =  int.Parse(entry);

               while (currentCount <= numberEntered)
              {
                Console.WriteLine("Yay!");
                currentCount = currentCount + 1;
              }
            }
            catch(FormatException)
                {
                    Console.WriteLine("You must enter a whole number.");
                    continue;
                }
            break;
          }
        }
    }
}

1 Answer

Steven Parker
Steven Parker
231,236 Points
Steven Parker
Steven Parker
231,236 Points

:warning: Be careful about testing a challenge in an external REPL or IDE.
If you have misunderstood the challenge, it's also very likely that you will misinterpret the results.

In this case, you have added an extra loop that prevents the program from ending if bad values are entered..

A program that follows the challenge instructions will only ask for input one time, and either print "Yay!"s or an error message. But either way it should end.