Challenges completed

[FeedMyData]

(except the AI voices commands)

[github-actions]

🚀 Project Submitted!

Thanks for submitting your project! I will review it soon.

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⚠️ If it's not marked as pending, submit it manually using the URL for this PR.

[TheCSharpAcademy]

@FeedMyData Thanks for submitting and apologies for the delay. Before we can review we need you to fix this issue:

⚠️ The project contains both Calculator and CalculatorLibrary, and Calculator.csproj correctly contains a ProjectReference to the library. However, there is no solution file (.sln) containing the two projects so it doesn't build.

Please rectify this and commit the changes when it's ready. No need to create a new pull-request😁

[FeedMyData]

Thanks for the feedback and no need to apologize. You are helping us on our freetime, I am the one who should thank you and apologize for the slow answer (I was on vacation).

[TheCSharpAcademy]

@FeedMyData Project approved! 😄✅And congratulations for completing some of the challenges. That's how you improve!! 👏👏 And you even cleaned up the original code from the tutorial, which is quite messy. 💪

Feedback
🔍️ One thing I'd improve is encapsulation. calculator.history and useCount are public fields. Prefer properties so you expose history as read-only where possible, and provide methods such as ClearHistory() instead of letting Program manipulate the calculator's internal collection directly. That would be a cleaner approach.

🔍One edge case to revisit is history logging. DoOperation() adds an OperationLog even when an operation produces NaN, such as division by zero or the square root of a negative number. It would be cleaner to only add successful calculations to the history

🗺️ I noticed that the only course you've completed so far is Introduction to Object-Oriented Programming. I'd highly recommend taking our LINQ Fundamentals course next. LINQ is one of the most important tools in modern C# and becoming comfortable with it will make your code much cleaner and more expressive.

☕If you like our roadmap, please consider buying us a coffee. We appreciate your help 🙂

Overall good work!✋🏻Looking forward to seeing your next projects!