Calculator Application

A modern calculator application built with Python and Tkinter, featuring a personalized welcome screen and customizable color themes.

Features

• User-friendly graphical interface
• Personalized welcome screen
• Customizable calculator background color
• Basic arithmetic operations (+, -, *, /)
• Chaining calculations
• Error handling for incorrect calculations
• Centered windows for better user experience

Requirements

• Python 3.x
• Tkinter (usually comes with Python installation)

Project Structure

calculator/
│
├── calculator.py       # Main calculator implementation
├── main.py            # Entry point of the application
├── icon.ico           # Application icon
└── README.md          # Documentation

Installation

1. Clone the repository or download the source code
2. Ensure Python 3.x is installed on your system
3. Place an icon file named icon.ico in the project directory
4. Run the application using main.py

Usage

1. Run the application:

   python main.py

2. On the welcome screen:

   • Enter your name
   • Choose a custom background color (optional)
   • Click "Login" to access the calculator
   • Or click "Quit" to exit

3. Using the calculator:

   • Click number buttons (0-9) to input values
   • Use operation buttons (+, -, *, /, %) for calculations
   • Press "=" to see the result
   • Press "C" to clear the display
   • Results can be used in subsequent calculations

Features Details

Welcome Screen

• Personalized greeting with user's name
• Color picker for calculator customization
• Input validation for smooth user experience

Calculator

• Large, clear display for calculations
• Intuitive button layout
• Error handling for invalid operations
• Continuous calculation support
• Responsive design
• Custom background color based on user selection

Technical Implementation

The project consists of two main classes:

WelcomeMessage Class

• Handles initial user interaction
• Manages name input and color selection
• Provides smooth transition to calculator

Calculator Class

• Implements core calculator functionality
• Manages calculation display and updates
• Handles user input and mathematical operations
• Provides error handling and input validation

Error Handling

The calculator includes robust error handling for:

• Division by zero
• Invalid mathematical expressions
• Syntax errors
• Empty calculations

Contributing

Feel free to fork this project and submit pull requests for any improvements.

License

This project is open-source and available for personal and educational use.