# Calculator App Implementation Plan

## Project Structure

- **calculator_app/**
  - **index.html**: The main HTML file containing the calculator layout.
  - **styles.css**: The CSS file for styling the calculator.
  - **app.js**: The JavaScript file for calculator logic.

## Implementation Steps

1. **Create `index.html`**
   - Set up the basic HTML structure.
   - Include buttons for digits (0-9), operations (+, -, *, /), and functionalities (C for clear, = for equals).
   - Add a display area to show input and results.

2. **Create `styles.css`**
   - Style the calculator layout, buttons, and display.
   - Ensure responsive design for different screen sizes.

3. **Create `app.js`**
   - Implement logic to handle button clicks.
   - Perform calculations and display results.
   - Handle edge cases and errors (e.g., division by zero).

4. **Test the application**
   - Verify all functionalities work as expected.
   - Test edge cases and ensure reliable performance.