A modern calculator built with WPF and C#, featuring state machine architecture and full keyboard support.
✨ Features
✅ Basic Operations - Add, Subtract, Multiply, Divide
✅ Operation Chaining - 5 + 3 + 2 = evaluates left-to-right
✅ Large Numbers - Supports up to 9.2 quintillion (64-bit long)
🎹 Keyboard Support - Full keyboard + mouse input
🔄 State Machine - Prevents input bugs, clean UX flow
🛡️ Error Handling - Division by zero protection with MessageBox alerts
📦 Modular Design - Separate UI and logic layers
Prerequisites Visual Studio 2019+, .NET Framework 4.7.2+
git clone https://github.com/fahmimee03/wpf-calculator.git
cd wpf-calculator
#Open Learning.sln in Visual Studio
#Press F5 to run
Learning/
├── Calculator/ # WPF UI Project
│ ├── MainWindow.xaml # UI Layout
│ └── MainWindow.xaml.cs # UI Logic + State Machine
│
└── Learning/ # Class Library
----├── BasicCalculator.cs # Core logic
----├── ScientificCalculator.cs
----├── ProgrammerCalculator.cs
----└── NumberConverter.cs # Binary/Hex/Octal
EnteringFirstNumber → OperationSelected → EnteringSecondNumber → ResultDisplayed
↑----------------------------------------------------------------------------------------↓
└────────────────── (New Calculation) ───────────────────┘
Why?
Prevents bugs like displaying "53" when user types 5 + 3 (should show "3").
- State Pattern - Manages calculator input flow
- Inheritance - Scientific/Programmer extend BasicCalculator
- Separation of Concerns - UI (WPF) ↔ Logic (DLL)
- Event-Driven - Single event handler for multiple buttons
Contributions welcome! Areas for improvement:
🔬 Scientific mode UI (logic exists)
💻 Programmer mode UI (Binary/Hex/Octal display)
📜 Calculation history panel
💾 Memory functions (M+, M-, MR, MC)
🎨 Themes/skins support
Please:
Fork the repository
Create feature branch (git checkout -b feature/amazing)
Commit changes (git commit -m 'Add amazing feature')
Push to branch (git push origin feature/amazing)
Open Pull Request
Design inspired by Windows Calculator
Built as part of C# WPF learning journey
State machine pattern from software engineering best practices