How to Use the Calculator App

A Calculator App is a digital tool designed to perform basic arithmetic operations like addition, subtraction, multiplication, and division.

What This App Does:

This browser-based calculator lets users enter expressions using on-screen buttons, displaying and calculating the result instantly using JavaScript’s built-in evaluation function.

Steps to Use the Calculator:

1. Launch the App: Open the HTML file in your browser.
2. Input Numbers & Operations: Use the buttons to enter your arithmetic expression. For example, press 8, +, 5.
3. Get the Result: Press the = button to calculate and view the result.
4. Clear the Display: Use the Clear button to reset the calculator for a new operation.

This app supports:

• Addition (+)
• Subtraction (−)
• Multiplication (×)
• Division (÷)
• Decimal points (.)

Calculator App FAQ

Q1: What operations can this calculator perform?
A: Basic arithmetic—addition, subtraction, multiplication, and division.

Q2: What happens if I enter an invalid expression?
A: You’ll see an alert that says “Invalid expression,” and the calculator will reset.

Q3: Can I use a keyboard with this app?
A: Currently, no. It’s optimized for button input. But it can be extended to support keyboard input if desired.

Q4: Does it support parentheses or advanced math functions?
A: Not yet. This is a basic calculator. You’d need to integrate a math library or custom logic to support advanced operations.

Q5: Is this safe to use with complex expressions?
A: For simple calculations, yes. However, since it uses eval()It’s best not to modify or expose this code on untrusted websites without input sanitization.