Calculator App Project
Project Objectives
- Build a functional calculator using JavaScript
- Practice working with arithmetic operators
- Implement event handling for button clicks
- Manipulate the DOM to update the display
- Handle user input and validation
Prerequisites: Before starting this project, you should complete the JavaScript Operators tutorial.
Project Description
In this project, you'll create a calculator application that can perform basic arithmetic operations. This project will help you understand how to work with JavaScript operators, handle user input, and update the display dynamically.
Your Calculator Should Include:
- A display area for input and results
- Buttons for numbers 0-9
- Buttons for basic operations (+, -, *, /)
- Clear and equals buttons
- Basic error handling for invalid operations
- A clean, user-friendly interface
Getting Started
Step 1: Set Up Your Project Files
Create the following files for your project:
index.html- The HTML structurestyles.css- CSS styles for your calculatorscript.js- JavaScript code for calculator logic
Step 2: Create the HTML Structure
Set up the basic HTML structure in your index.html file:
Step 3: Add Basic Styles
Add some basic styles to your styles.css file:
Step 4: Implement Calculator Logic
Add the basic calculator logic to your script.js file:
Challenge Yourself
Once you've completed the basic calculator, try these enhancements:
Advanced Features
- Add support for decimal numbers
- Implement keyboard input support
- Add memory functions (M+, M-, MR, MC)
- Include scientific calculator functions
- Add a calculation history feature
Testing Your Calculator
Test your calculator with these scenarios:
- Basic arithmetic operations (2 + 2 = 4)
- Multiple operations (2 + 3 * 4 = 14)
- Division by zero (should show error)
- Large numbers (check for overflow)
- Decimal calculations (0.1 + 0.2 = 0.3)