Console Calculator Pro

An interactive console-based calculator built as part of The C# Academy curriculum. The goal is to practice C# console application development.

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Features

• Interactive TUI: Powered by Terminal.Gui, the application renders a fully interactive, mouse-friendly interface directly in the terminal — tabs, styled buttons, and a dual-line display included.
• Complex expression evaluation: Powered by NCalc, supports operator precedence, parentheses, and localized operators (e.g. 19×(38÷4)+2). Results are formatted to up to 8 decimal places.
• Keyboard support: Full keyboard input — digits, operators, Enter to evaluate, Backspace to delete, and C to clear.
• Graceful error handling: Invalid expressions and undefined results (e.g. division by zero) produce an Error state without crashing.
• Clean architecture: UI, engine, and evaluation logic are separated into distinct layers. CalculatorEngine depends on IBasicService, injected via constructor — making the core fully testable without touching the UI.
• Unit tested: Core behaviour is covered by xUnit + FluentAssertions tests across both BasicService and CalculatorEngine.
• Planned — AI Voice Input: As part of the C# Academy's AI Challenge, future versions will integrate Azure Language Services to accept spoken calculations.

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Tech Stack

Runtime	C# / .NET 10
TUI framework	Terminal.Gui
Expression parser	NCalcSync
Testing	xUnit + FluentAssertions
Planned	Azure Cognitive Services (speech-to-text)

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How to Run

# 1. Clone the repository
git clone https://github.com/your-username/ConsoleCalculator.git
cd ConsoleCalculator

# 2. Restore dependencies
dotnet restore

# 3. Run the application
dotnet run --project src/ConsoleCalculator

# 4. Run the test suite
dotnet test