Scientific Calculator

A modern, web-based scientific calculator built with Streamlit. Perform basic arithmetic, advanced scientific calculations, and keep a history of your calculations.

Features

✨ Core Features:

• Basic arithmetic operations (+, -, *, /)
• Advanced operations (power, modulo, reciprocal)
• Scientific functions (sin, cos, tan, sqrt, log, ln)
• Calculation history with timestamps
• Clean, responsive UI

🔢 Number Handling:

• Decimal point support with validation
• Automatic decimal precision (10 places)
• Leading zero handling
• Result formatting (removes trailing zeros)

🎯 User Experience:

• Pending operation indicator
• Real-time display updates
• Error handling with user-friendly messages
• One-click history clearing
• Keyboard-friendly button layout

Installation

1. Clone the repository:

git clone https://github.com/mdaipayan/Simple-Calculator.git
cd Simple-Calculator

2. Install dependencies:

pip install -r requirements.txt

3. Run the app:

streamlit run app.py

Project Structure

├── app.py              # Main application file
├── calculator.py       # Core calculator logic
├── config.py          # Configuration and constants
├── ui_builder.py      # UI component builders
├── requirements.txt   # Python dependencies
├── LICENSE            # MIT License
└── README.md          # This file

Architecture Improvements

This refactored version includes:

• Modular Design: Business logic separated from UI
• Reduced Duplication: Reusable button grid and component builders
• Better Error Handling: User-friendly error messages for domain errors
• Configuration Management: Centralized settings
• Improved State Management: Using setdefault() for cleaner initialization
• Enhanced Validation: Decimal and input validation
• Operation Indicator: Visual feedback for pending operations

Usage Examples

Basic Arithmetic

1. Click "5" + "3" + "=" → Result: 8
2. Click "10" ÷ "2" + "=" → Result: 5

Scientific Functions

1. Click "30" then "sin" → Result: 0.5
2. Click "16" then "√" → Result: 4

Using History

• All calculations are logged with timestamps
• View up to the last 10 calculations
• Click "Clear History" to reset

Configuration

Edit config.py to customize:

# Display precision
CALC_CONFIG['DECIMAL_PLACES'] = 10

# Maximum history items shown
CALC_CONFIG['MAX_HISTORY'] = 10

# UI layout and appearance
UI_CONFIG['LAYOUT'] = 'wide'

Error Handling

The calculator handles:

• Division by zero
• Negative square roots
• Logarithms of non-positive numbers
• Invalid input formats
• Overflow conditions

Requirements

• Python 3.7+
• Streamlit 1.0+

License

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

Future Enhancements

• Keyboard input support
• Memory operations (M+, M-, MR, MC)
• Operator chaining
• Dark mode theme toggle
• Export calculation history
• Graphing capabilities