Create A Simple Calculator In Javascript Hackerrank? The 189 Top Answers

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Simple calculator using Javascript

Simple calculator using Javascript

Simple calculator using Javascript

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Javascript Fundamentals : Simple Calculator Error

I have an exercise to perform Simple Calculation using Javascript. The code works fine in Visual Studio but not in the Hackerrank test site …

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Source: stackoverflow.com

Date Published: 6/12/2022

View: 1143

Day 9: Binary Calculator Topics | 10 Days of Javascript Tutorial

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Date Published: 12/3/2021

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Create a simple calculator using Javascript – QA With Experts

In this article, I have explained how you can easily create a simple calculator using javascript’s eval function (step by step tutorial with …

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simple calculator using javascript hackerrank – SourceCodeHero

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How to Create A Simple Calculator in JavaScript

Sara February 6, 2017. 5 · 1 · in. Contents. Veo; Sample Code. index.html. Veo. How to Create A Simple Calculator using JavaScript.

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Source: codingwithsara.com

Date Published: 4/24/2021

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To create a simple calculator in JavaScript hackerrank

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How to Build a Simple Calculator Using HTML, CSS, and …

Simple, calculated code is the way to go when programming. Check out how to build your own calculator in HTML, CSS, and JS.

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Date Published: 6/24/2022

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Javascript Fundamentals : Simple Calculator Error

I have an exercise to do a simple calculation using javascript. The code works fine in Visual Studio but not on the Hackerrank test site where I have to do the exercise.

HTML code: (already given, cannot be changed) :

JS file that I can modify. I can't remove the different features or add a new one

var text = ""; function update(value) { //Enter the code here. text+= value; document.getElementById('screen').value = value; } function result() { //Enter the code here. document.getElementById('screen').value = eval(text); } function form_reset() { //Enter the code here. document.getElementById('screen').value =""; text = ""; }

When I run the test, it is validated against the following test cases. It fails on the function result(); when adding 7 and 8

description('Calc Handson', function() { beforeEach(function() { document.body.innerHTML='

< INPUT TYPE="button" NAME="6" VALUE=" 6 " onclick="update(6)">

'; }); afterEach(function() { document.body.removeChild(document.getElementById('app')); }); description('Calc', function() { it('update function should exist', function() { update(1); Expect(document.getElementById("screen").value).toBe('1'); } ); it('update function should exist', function() { update(2); Expect(document.getElementById("screen").value).toBe('2'); }); it('update function should exist', function() { update(3); Expect(document.getElementById("screen").value).toBe('3'); }); it('update function should exist', function() { update (4); Expect(document.getElementById("screen").value).toBe('4'); }); it('update function should exist', function() { update(5); Expect(document. getElementById("screen").value).toBe('5'); }); it('update function should exist', function() { update(6); Expect(document.getElementById("screen").value ).toBe('6'); }); it('update function should exist', function() { update(7); Expect(document.getElementById("screen").value).toBe('7') ; }); it('Update function should exist', function() { update(8); Expect(document.getElementById("screen").val ue).toBe('8' ); }); it('update function should exist', function() { update(9); Expect(document.getElementById("screen").value).toBe('9'); }); it('update function should exist', function() { update(0); Expect(document.getElementById("screen").value).toBe('0'); }); it('update function should exist', function() { update('*'); Expect(document.getElementById("screen").value).toBe('*'); }); it('update function should exist', function() { update('+'); Expect(document.getElementById("screen").value).toBe('+'); }); it('update function should exist', function() { update('-'); Expect(document.getElementById("screen").value).toBe('-'); }); it('update function should exist', function() { update('/'); Expect(document.getElementById("screen").value).toBe('/'); }); it('Result function should exist', function() { update(7); update('+'); update(8); result(); Expect(document.getElementById("screen").value).toBe( ' fifteen'); }); it('form_reset function should exist', function() { update(7); form_reset(); Expect(document.getElementById("screen").value).toBe(''); }); }); });

Error I get is:

Node.js (linux; U; rv:v8.9.4) Calc Handson Calc result function should exist FAILED SyntaxError: Invalid regular expression: missing / at result (app/index.js:10:52) at UserContext. ( test/index_test.js:88:6) Node.js (linux; U; rv:v8.9.4): 16 of 16 executed (1 FAILED) (0.175s / 0.178s)

Help kindly.

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Create a simple calculator using Javascript

If you're just starting to learn Javascript, someone may commission you to create a basic calculator project using Javascript. So, in this article, I am going to provide you with a simple code to create a calculator with Javascript's Eval function that will do all the work for you with a single click.

The very first step is to look out for a header so each browser knows what to expect. Headers are not part of this tutorial. However, you can find loads of information by typing "HTML headers" into Google. So copy and paste the following code into a blank document and then save it as "SimpleCalculator.html" in a folder called "javascript-calculator".

Now we're going to create the main part of the calculator, so basically we're going to provide the 0-9 buttons and all the other math operators like plus (+), minus (-), divide (/), and multiples (*). )

Here is the form with table where we provide these buttons to the user

In the HTML above, we've only added buttons for our user, with each line having 4 buttons and then
. Now if you noticed that we also added a javascript function that we call when the button is clicked

One of the most important javascript functions is updateTextbox(), which updates the textbox with id=screen when a button is clicked, for example, if we click "5" on a calculator, updateTextbox(5) will be called, which will add text/ appends "5" to the main screen with the following JS code

Function updateTextbox(value){ document.getElementById("screen").value += value; }

The second most important and most important function is result() , which evaluates all text data written in the text field of the screen by using javascript's Eval function

function result(){ document.getElementById("screen").value = eval(document.getElementById("screen").value); }

The last JS function we are going to use is reset() , which clears the screen's text box data

Function reset(){ document.getElementById("screen").value = ''; }

So your complete JS code looks like this

which we will place just before in the HTML so that your full HTML will be displayed with calculator functions

< input TYPE="button" NAME="1" VALUE=" 1 " onclick="updateTextbox(1)">

In the HTML above, we simply added input-type button elements, so we can have numbers like we normally do in a regular calculator.

And we also added javascript events with method "onClick=updateTextbox" which will help us to execute math functions by passing number of expressions to JS function "Result".

You can also style buttons by giving them CSS. This step is optional, but I provide the CSS code below

input[type=button] { display: inline block; text decoration: none; Color: #fff; font weight: bold; background color: #538fbe; border: 10px ; Font size: 16px; border: 1px solid #2d6898; width: 50 pixels; text alignment: center; Background image: linear gradient (bottom, rgb(73.132.180) 0%, rgb(97.155.203) 100%)); background image: -o-linear-gradient(bottom, rgb(73,132,180) 0%, rgb(97,155,203) 100%); Background image: -moz-linear-gradient(bottom, rgb(73,132,180) 0%, rgb(97,155,203) 100%); Background image: -webkit-linear-gradient(bottom, rgb(73,132,180) 0%, rgb(97,155,203) 100%); Background image: -ms-linear-gradient(bottom, rgb(73,132,180) 0%, rgb(97,155,203) 100%); -webkit-box-shadow: 0px 3px 0px #2b638f, 0px 3px 10px rgba(0,0,0,.2); -moz-box-shadow: 0px 3px 0px #2b638f, 0px 3px 10px rgba(0,0,0,.2); Box Shadow: 0px 3px 0px #2b638f, 0px 3px 10px rgba(0,0,0,.2); }

The full output would be as follows

Gif image demo

Thanks for reading, don't hesitate to ask any questions about it in the comments section.

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