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Simple Calculator using HTML, CSS & JavaScript

This Simple Calculator App is a beginner-friendly project built using HTML5, CSS3, and Vanilla JavaScript. It performs basic arithmetic operations like addition, subtraction, multiplication, and division — making it a perfect mini project for new developers to understand core JavaScript logic and DOM manipulation.

🔹 Key Features:

  • Basic Operations: Addition, Subtraction, Multiplication, Division, and Decimal Handling.
  • Clear & Delete: Reset the full input or delete the last digit using dedicated buttons.
  • Error Handling: Invalid expressions are caught and displayed as "Error".
  • Responsive Layout: Clean and centered UI layout using basic CSS Flexbox.

📁 File Structure:

calculator-app/
├── index.html
├── style.css
└── script.js

⚙️ How to Run:

  1. Clone or download the repository to your local machine.
  2. Open index.html in your browser.
  3. Try out the calculator functions like basic math, clear, delete, and decimal operations.

💡 Why Build This?

This project is an excellent way to practice and demonstrate your skills in:

  • Basic DOM manipulation
  • Event handling in JavaScript
  • JavaScript methods like eval(), slice(), and try-catch blocks
  • Styling layouts with Flexbox and responsive units

🔗 GitHub Repository

You can view or download the full project source code from my GitHub:

👉 View on GitHub

🧪 Live Demo on CodePen

Want to try it without downloading? Check it out live on CodePen:

▶️ Open Calculator on CodePen

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