# How to make a calculator using javascript and html

## JavaScript code to design calculator

Create simple calculator using javascript html and css in hindi 2017

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This is an epic article where you learn how to build a calculator from scratch. Before you attempt follow through the lesson, please make sure you have a decent command of JavaScript. Minimally, you need to know these things:. I urge you to try and build the calculator yourself before following the lesson. This has already been done for you in the starter file. You can find the starter file at this pen.

Our calculator will only able to perform basic math operations: addition, subtraction, multiplication and division. I simplified this tutorial as best as I could, so you would survive :. So what exactly do we need to build this? But in fancier terms, these are the components we need:. Visually, a calculator is a table enclosed in a container. And as you should already know tables are made of rows and columns with cells to contain table data.

Calculator is one of the basic project a Javascript or any other language a newbie programmer should probably know how to create. It is a basic project because it entails arithmetic operations. All you have to do is to create a button for each numbers, arithmetic operations. Oyetoke Toby Sep 29 Each buttons created has their own event handlers and functions. Whenever a number button is clicked, it prints the number indicated on the button into the textbox which is the screen.

CSS3 box shadows are used to create the 3D effect and transitions are used for the smooth press effect. Basic regex is used for validations and text replacements. For every button number or operator pressed, the value is appended to an equation string displayed on the calculator screen which is later used in the JS eval function to generate the output.
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This tutorial provides an exercise in doing just that by describing how to build a simple calculator app. I will explain each step at a higher level than in my previous tutorials, so if you have trouble following, try doing the Random Quote Machine and Wikipedia Search App tutorials in that order, then come back to this one at a later date. Also, make sure you complete the previous tutorial which explains how the calculator layout was crafted using CSS Grid. This article focuses only on the JavaScript logic employed to make the calculator work. You can find the starting point for this tutorial on JSFiddle. It contains all the necessary markup to build the calculator layout.

## How to build a Simple Calculator App with JavaScript

Speed Coding - HTML, CSS, JS - Calculator

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