A lightweight browser-based calculator built using HTML, CSS, and JavaScript. This project demonstrates basic DOM manipulation, event handling, and dynamic expression evaluation in JavaScript.
- Basic arithmetic operations (+, −, ×, ÷)
- Decimal support
- Parentheses support for complex expressions
- Real-time display updates
- Clear (AC) and Backspace functionality
- Input validation to prevent invalid expressions
- Responsive centered UI
- HTML5 – Structure of the calculator
- CSS3 – Styling and layout
- JavaScript (Vanilla) – Logic and calculations
click the link to visit the calculator
simple-calculator/
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└── index.html # Main calculator file (HTML + CSS + JS)
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Download or clone the repository
git clone https://github.com/your-username/simple-calculator.git
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Open the project folder
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Double-click index.html OR open with Live Server
That’s it. No frameworks, no dependencies, no emotional damage.
This project helps understand:
- DOM manipulation
- JavaScript event handling
- Expression parsing
- UI design fundamentals
- Basic input validation
The calculator uses JavaScript’s dynamic function evaluation for computing expressions. While input validation is implemented, this approach should be avoided in production-grade applications.
- Keyboard input support
- Dark/light theme toggle
- Scientific calculator functions
- Calculation history
- Improved expression parser (without dynamic evaluation)
Hrikved Paul Cybersecurity enthusiast | SOC aspirant
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