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15-Digit Calculator with 7-Segment Display

Overview

This Windows Forms application implements a 15-digit calculator with a realistic 7-segment display simulation. The calculator supports basic arithmetic operations (addition, subtraction, multiplication, division), decimal values, and includes advanced features like positive/negative toggling and multi-operation chaining.

Features

• 🧮 15-digit precision display with 7-segment LED simulation
• ⚡ Basic operations: Addition, Subtraction, Multiplication, Division
• 🔢 Decimal support with intelligent dot handling
• 🔄 Operation chaining for complex calculations
• ➕/➖ Sign toggle for positive/negative values
• 🔙 Backspace functionality for error correction
• 🧹 Clear button to reset calculations
• 📊 Visual tracking of current operation and previous values

Code Structure

Key Components:

1. Main Form (frm15DigitScreen):

   • Manages calculator state and UI interactions
   • Handles digit input and operations
   • Tracks calculation history

2. 7-Segment Display Control (ctrlLCDScreen):

   • Custom control that simulates a 15-digit LED display
   • Handles value formatting and digit rendering

3. Calculation Logic:

   • State machine for operation management
   • Double precision arithmetic
   • Input validation and error handling

Important Methods:

• DoOperations() - Executes arithmetic operations based on current state
• _SetOperation() - Manages operation transitions
• _GetInput() - Processes digit and special character input
• DoCalculation() - Performs chained operations
• BackSpace() - Handles digit removal

Getting Started

Prerequisites

• .NET Framework 4.7.2 or later
• Visual Studio 2019+ (recommended)

Installation

1. Clone the repository:

   git clone https://github.com/MohmdAliMohmd/15-digit-calculator.git

2. Open the solution in Visual Studio
3. Build the solution (Ctrl+Shift+B)
4. Run the application (F5)

Usage

1. Enter numbers using the digit buttons
2. Use . for decimal values
3. Select an operation (+, -, ×, ÷)
4. Continue calculations or press = for results
5. Use C to clear the current calculation
6. Toggle sign with +/- button

License

This project is licensed under the MIT License - see the LICENSE.md file for details.

Contributing

Contributions are welcome! Please follow these steps:

1. Fork the project
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a pull request

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Note: This project includes a custom 7-segment display control that simulates physical calculator displays. The implementation handles digit limitations (15 digits max) and decimal point constraints intelligently.