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  1. 123

    A JavaScript calculator is a simple web-based tool that performs basic arithmetic operations like addition, subtraction, multiplication, and division using HTML for structure, CSS for styling, and JavaScript for logic.

    Example: Basic Functional Calculator

    <!DOCTYPE html>
    <html>
    <head>
    <style>
    body { font-family: Arial; display: flex; justify-content: center; align-items: center; height: 100vh; background: #f2f2f2; }
    .calculator { width: 300px; background: #fff; border-radius: 15px; padding: 20px; box-shadow: 0 8px 16px rgba(0,0,0,0.1); }
    .display { width: 100%; height: 50px; text-align: right; font-size: 1.5rem; margin-bottom: 20px; border: none; background: #ffeb3b; border-radius: 8px; padding-right: 10px;}
    .buttons { display: grid; grid-template-columns: repeat(4,1fr); gap: 10px;}
    button { padding: 20px; font-size: 1.2rem; border-radius: 10px; border:none; cursor:pointer;}
    </style>
    </head>
    <body>
    <div class="calculator">
    <input type="text" id="display" class="display" disabled>
    <div class="buttons">
    <button onclick="clearDisplay()">C</button>
    <button onclick="appendOp('/')">/</button>
    <button onclick="appendOp('*')">*</button>
    <button onclick="appendOp('-')">-</button>
    <button onclick="appendNum('7')">7</button>
    <button onclick="appendNum('8')">8</button>
    <button onclick="appendNum('9')">9</button>
    <button onclick="appendOp('+')">+</button>
    <button onclick="appendNum('4')">4</button>
    <button onclick="appendNum('5')">5</button>
    <button onclick="appendNum('6')">6</button>
    <button rowspan="2" onclick="calculate()">=</button>
    <button onclick="appendNum('1')">1</button>
    <button onclick="appendNum('2')">2</button>
    <button onclick="appendNum('3')">3</button>
    <button onclick="appendNum('0')">0</button>
    </div>
    </div>

    <script>
    let current = '', prev = '', op = '';

    function appendNum(num) {
    current += num;
    updateDisplay();
    }

    function appendOp(operation) {
    if (current === '') return;
    if (prev !== '') calculate();
    op = operation;
    prev = current;
    current = '';
    }

    function calculate() {
    if (prev === '' || current === '') return;
    let result;
    const a = parseFloat(prev), b = parseFloat(current);
    switch(op) {
    case '+': result = a + b; break;
    case '-': result = a - b; break;
    case '*': result = a * b; break;
    case '/': if (b === 0) { alert("Cannot divide by zero"); return;} result = a / b; break;
    default: return;
    }
    current = result.toString();
    op = ''; prev = '';
    updateDisplay();
    }

    function clearDisplay() {
    current = ''; prev = ''; op = '';
    updateDisplay();
    }

    function updateDisplay() {
    document.getElementById('display').value = `${prev} ${op} ${current}`;
    }
    </script>
    </body>
    </html>
    Cóipeáilte!
    Aiseolas
    Go raibh maith agat!Inis tuilleadh dúinn
  2. GeeksForGeeks
    https://www.geeksforgeeks.org › javascript › javascript-calculatorAistrigh an toradh seo

    JavaScript Calculator App - GeeksforGeeks

    23 Iúil 2025 · To build a simple calculator using JavaScript, we need to handle basic arithmetic operations such as addition, subtraction, multiplication, and division. JavaScript, along with HTML …

    • To build a simple calculator using JavaScript, we need to handle basic arithmetic operations such as addition, subtraction, multiplication, and division. JavaScript…

    Féach torthaí ó geeksforgeeks.org amháin
  3. log4javascript.org
    https://log4javascript.org › javascript-calculatorAistrigh an toradh seo

    JavaScript Calculator: HTML, Functions, and Advanced …

    6 Feabh 2024 · Below, we’ll explore how to make a calculator in JavaScript, taking a detailed look at the components involved, the HTML code needed, and the …

  5. DEV Community
    https://dev.to › codehuntersharath › how-to-crea…Aistrigh an toradh seo

    How To Create a Calculator Using HTML CSS

    4 Noll 2023 · Welcome to our JavaScript Calculator Coding Tutorials. In this article, we'll walk you through a step-by-Step guide to building a fully functional …

  6. Educative
    https://www.educative.io › answers › how-to-build-a...Aistrigh an toradh seo

    How to build a calculator in JavaScript - Educative

    JavaScript is a versatile programming language that allows us to create dynamic and interactive web applications. Let's build a simple calculator using HTML, CSS, and JavaScript.

  7. TutorialsPoint
    https://www.tutorialspoint.com › article › real-time...Aistrigh an toradh seo

    Create a Calculator using HTML, CSS, and JavaScript

    Calculator is a simple tool which performs basic arithmetic calculations like Addition, Subtraction, Multiplication and Division. In this article, we are going to discuss how to create a Calculator using …

  8. WsCube Tech
    https://www.wscubetech.com › resources › javascript › ...Aistrigh an toradh seo

    JavaScript Simple Calculator Program (4 Ways With Code)

    Master JavaScript calculator programs with ease! Explore four simple ways to create a calculator using JavaScript code. Learn now!

  9. Programiz
    https://www.programiz.com › javascript › examples › ...Aistrigh an toradh seo

    JavaScript Program to Make a Simple Calculator

    In this example, you will learn to write a program to make a simple calculator in JavaScript.

  10. agirlamonggeeks.com
    https://agirlamonggeeks.com › how-to-make-a...Aistrigh an toradh seo

    How Can You Make a Calculator in JavaScript?

    Learn how to make a calculator in JavaScript with this easy step-by-step guide. Perfect for beginners, this tutorial covers all the essential coding techniques to build a functional calculator.

  11. Delft Stack
    https://www.delftstack.com › howto › javascript …Aistrigh an toradh seo

    How to Create A Simple Calculator in JavaScript - Delft …

    2 Feabh 2024 · This article shows how to develop simple calculator using multiple ways on JavaScript.

  12. Envato Tuts+
    https://webdesign.tutsplus.com › build-a-simple...Aistrigh an toradh seo

    Build a simple calculator with HTML, CSS, and JavaScript

    21 Lún 2024 · In this tutorial, we'll build a calculator with HTML, CSS, and JavaScript. Use it to perform basic operations: subtraction, addition, …

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