Calculator Console App

[ivangar]

Summary
• Add a simple console calculator application implemented as a small library.
• Implements basic arithmetic, square root, exponentiation and trigonometric operations.
• Logs operations to a JSON file and keeps an in-memory history (printable / clearable).

Library: CalculatorLibrary
• CalculatorLibrary — core engine that orchestrates operations, logging and repository.
• CalculatorMath — math helpers with safe Try-style methods for divide, sqrt, exponent and trig (with validation + rounding).
• OperationFactory — factory for creating operation model instances.
• OperationRepository — in-memory repository for operation history with printing and clearing.
• CalculatorLogWriter — JSON logging to calculator.json with write/delete semantics.

How to run / test
• Open solution in Visual Studio 2026 or run from terminal:
• Set startup project to Calculator.ivangar.
• Run the project (F5 or dotnet run from project folder).
• Exercise menu options:
• Perform operations and verify console output.
• Check calculator.json created at app working directory and verify recorded operations.
• Use "View operations" to print history; "Delete operations" to clear history and reset JSON operations array.

[github-actions]

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[TheCSharpAcademy]

@ivangar Project approved! 😄✅ And well done for extending the project and completing the challenges! That's how you learn! It's always a good use of your time. 💪💪😟

🥋You still need to submit your Freecodecamp certificate before you start earning belts 😊

Feedback
🔍It would be great if users could use their previous results in new calculations!

🔍For further refinement, I'd keep the class library independent from the UI. CalculatorMath and OperationRepository write directly to Console. Ideally, the library should return results/errors and let the console project decide how to display them. This makes CalculatorLibrary reusable with other interfaces later.

🔍Reduce repetition in Application. BaseMathOperation, SquareRootOperation, PowerOperation, and TrigonometryOperation repeat very similar try/catch and double.IsNaN handling. Consider extracting the common execution/error-handling logic into a helper method to keep things DRY.

🔍Improve naming/convention consistency. Fields such as EndApp and Calculator are private fields but use PascalCase, while _random correctly uses the conventional underscore/camelCase style. Using _endApp and _calculator would make the code more consistent with standard C# conventions.

🗺️ I noticed that the only course you've completed so are the Introduction to Object-Oriented Programming and Intro to Web APIs. 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!