Add interactive calculator web application

[Copilot]

Implements a homework assignment: a browser-based calculator with standard arithmetic operations.

Implementation

• HTML structure (index.html): Calculator display with 4×5 button grid, accessibility attributes for screen readers
• CSS styling (style.css): Grid layout, gradient background, hover animations
• JavaScript logic (script.js):
  • Arithmetic evaluation with error handling
  • Keyboard navigation (0-9, operators, Enter/Escape/Backspace)
  • Note on eval() usage for educational context

Interface

Usage

Open index.html in browser. Supports click and keyboard input with standard calculator shortcuts.

Original prompt

homework

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