Creating a Simple Calculator with HTML, CSS, and JavaScript

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A calculator is a basic and essential tool for daily life and it can be a great project for beginners to learn HTML, CSS, and JavaScript. In this article, we'll show you how to build a simple calculator from scratch using these technologies.

Creating a Simple Calculator with HTML, CSS, and JavaScript
Creating a Simple Calculator with HTML, CSS, and JavaScript

Step 1: Setting up the HTML


To start, we need to create the basic structure of the calculator using HTML. We'll create a table with 4 rows and 5 columns to display the calculator buttons. Each cell of the table will contain a button for a number, operator, or special function (such as clear or equal).

Here's the HTML code:

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<table>  <tr>    <td><button>1</button></td>    <td><button>2</button></td>    <td><button>3</button></td>    <td><button>+</button></td>    <td><button>C</button></td>  </tr>  <tr>    <td><button>4</button></td>    <td><button>5</button></td>    <td><button>6</button></td>    <td><button>-</button></td>    <td><button>CE</button></td>  </tr>  <tr>    <td><button>7</button></td>    <td><button>8</button></td>    <td><button>9</button></td>    <td><button>*</button></td>    <td><button>=</button></td>  </tr>  <tr>    <td><button>0</button></td>    <td><button>.</button></td>    <td colspan="2"><button>/</button></td>    <td></td>  </tr></table>

Step 2: Styling the Calculator with CSS


Now that we have the basic structure of the calculator, let's add some styles to make it look nice and professional. We'll use CSS to adjust the size and color of the buttons, and to give the calculator a border.

Here's the CSS code:

table {  margin: 0 auto;  border: 2px solid black; }button {  width: 50px;  height: 50px;  font-size: 20px;  color: white;  background-color: black;  border: none; }button:hover {  background-color: gray; }

Step 3: Adding Functionality with JavaScript


Finally, we'll add the functionality to the calculator using JavaScript. When a button is clicked, we'll capture its value and update the display to show the result.

Here's the JavaScript code:

const buttons = document.querySelectorAll("button");const display = document.querySelector("#display"); for (const button of buttons) {  button.addEventListener("click", function () {    const value = this.innerHTML;    switch (value) {      case "+":      case "-":      case "*":
Creating a Simple Calculator with HTML, CSS, and JavaScript


Frequently Asked Questions


What is a calculator?

A calculator is a device or software application used to perform basic arithmetic operations.

Why build a calculator with HTML, CSS, and JavaScript?

Building a calculator with HTML, CSS, and JavaScript is a great project for beginners to learn and practice web development skills, such as creating a user interface, styling with CSS, and adding interactivity with JavaScript.

How do I create a calculator with HTML, CSS, and JavaScript?

To create a calculator with HTML, CSS, and JavaScript, you first need to create the structure of the calculator using HTML, add styles to make it look nice with CSS, and finally, add the functionality to the calculator using JavaScript.

What is the process of building a calculator with HTML, CSS, and JavaScript?

The process of building a calculator with HTML, CSS, and JavaScript involves setting up the HTML structure, styling the calculator with CSS, and adding the functionality with JavaScript. The HTML structure consists of buttons for the numbers, operators, and special functions. CSS is used to adjust the size, color, and border of the buttons. JavaScript is used to capture the values of the buttons when they are clicked and update the display to show the result.

How can I make my calculator look professional with CSS?

To make your calculator look professional with CSS, you can adjust the size and color of the buttons, add hover effects, and give the calculator a border. You can also use CSS to set the width and height of the buttons, set the font size, and define the background color and color of the text.

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