{"id":1465,"date":"2016-07-17T04:10:24","date_gmt":"2016-07-17T04:10:24","guid":{"rendered":"http:\/\/javascript-tutor.net\/?p=1465"},"modified":"2017-09-21T13:35:01","modified_gmt":"2017-09-21T13:35:01","slug":"creating-simple-calculator","status":"publish","type":"post","link":"https:\/\/javascript-tutor.net\/index.php\/2016\/07\/17\/creating-simple-calculator\/","title":{"rendered":"Creating a Simple Calculator"},"content":{"rendered":"

We can create a simple calculator that adds two numbers.<\/p>\n

First we create a function that generates two random numbers that are less than 100 and converts them into integers , as follows:<\/p>\n

<script>
\nfunction RandomFn() {
\ndocument.getElementById(“num1”).innerHTML = parseInt(Math.random()*100);
\ndocument.getElementById(“num2”).innerHTML = parseInt(Math.random()*100);<\/p>\n

}<\/p>\n

The innerHTML property is to specify the HTML content of an element. The parseInt function is to convert a number into interger so that it can be manipulated mathematically.<\/p>\n

The function to add two numbers is shown as follows:<\/p>\n

function myFunction() {
\nvar number1;
\nvar number2;
\nnumber1=document.getElementById(‘num1’).innerHTML ;
\nnumber2=document.getElementById(‘num2’).innerHTML;
\nvar sum=parseInt(number1)+parseInt(number2);
\ndocument.getElementById(‘ans’).textContent=”The sum of two numbers= “+sum;
\n}<\/p>\n

textContent method is to display the output within a HTML element.<\/p>\n

The complete HTML code is as follows:<\/p>\n

<!DOCTYPE html>
\n<html>
\n<head>
\n<title>Simple JS Calculator><\/title>
\n<meta name=viewport content=”width=device-width, initial-scale=1″>
\n<\/head>
\n<body onload=”RandomFn()”>
\n<script type=”text\/javascript” src=”kidmath.js”><\/script>
\n<h3>Addition of Two Numbers<\/h3>
\n<p>Please calculate the sum of two numbers.<\/p>
\n<form id=”Myform”>
\nNumber 1: <b id=”num1″><\/b><br><br>
\nNumber 2: <b id=”num2″><\/b>
\n<p id=”ans”>Calculate the sum of two numbers<\/p><br>
\n<input type=”button” value=”Calculate” onclick=”myFunction()”><br><br>
\n<input type=”button” value=”Next Question” onclick=”Nextq()”>
\n<\/form>
\n<script>
\nfunction Nextq() {
\nlocation.reload();
\n}
\n<\/script>
\n<script>
\nfunction RandomFn() {
\ndocument.getElementById(“num1”).innerHTML = parseInt(Math.random()*100);
\ndocument.getElementById(“num2”).innerHTML = parseInt(Math.random()*100);<\/p>\n

}
\n<\/script><\/p>\n

<\/body>
\n<\/html><\/p>\n

Click Simple Calculator<\/a> to see the output.<\/p>\n","protected":false},"excerpt":{"rendered":"

We can create a simple calculator that adds two numbers. First we create a function that generates two random numbers that are less than 100 and converts them into integers , as follows: <script> function RandomFn() { document.getElementById(“num1”).innerHTML = parseInt(Math.random()*100); document.getElementById(“num2”).innerHTML = parseInt(Math.random()*100); } The innerHTML property is to specify the HTML content of an … Continue reading “Creating a Simple Calculator”<\/span><\/a><\/p>\n","protected":false},"author":35895,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1465","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nCreating a Simple Calculator - Learn JavaScript Online | Free Interactive JavaScript Tutorials<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/javascript-tutor.net\/index.php\/2016\/07\/17\/creating-simple-calculator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Creating a Simple Calculator - Learn JavaScript Online | Free Interactive JavaScript Tutorials\" \/>\n<meta property=\"og:description\" content=\"We can create a simple calculator that adds two numbers. First we create a function that generates two random numbers that are less than 100 and converts them into integers , as follows: <script> function RandomFn() { document.getElementById(“num1”).innerHTML = parseInt(Math.random()*100); document.getElementById(“num2”).innerHTML = parseInt(Math.random()*100); } The innerHTML property is to specify the HTML content of an … Continue reading "Creating a Simple Calculator"\" \/>\n<meta property=\"og:url\" content=\"https:\/\/javascript-tutor.net\/index.php\/2016\/07\/17\/creating-simple-calculator\/\" \/>\n<meta property=\"og:site_name\" content=\"Learn JavaScript Online | Free Interactive JavaScript Tutorials\" \/>\n<meta property=\"article:published_time\" content=\"2016-07-17T04:10:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2017-09-21T13:35:01+00:00\" \/>\n<meta name=\"author\" content=\"Liew Voon Kiong\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Liew Voon Kiong\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/javascript-tutor.net\/index.php\/2016\/07\/17\/creating-simple-calculator\/\",\"url\":\"https:\/\/javascript-tutor.net\/index.php\/2016\/07\/17\/creating-simple-calculator\/\",\"name\":\"Creating a Simple Calculator - Learn JavaScript Online | Free Interactive JavaScript Tutorials\",\"isPartOf\":{\"@id\":\"https:\/\/javascript-tutor.net\/#website\"},\"datePublished\":\"2016-07-17T04:10:24+00:00\",\"dateModified\":\"2017-09-21T13:35:01+00:00\",\"author\":{\"@id\":\"https:\/\/javascript-tutor.net\/#\/schema\/person\/63d832c3efdf443517b5f5bfd1b93df8\"},\"breadcrumb\":{\"@id\":\"https:\/\/javascript-tutor.net\/index.php\/2016\/07\/17\/creating-simple-calculator\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/javascript-tutor.net\/index.php\/2016\/07\/17\/creating-simple-calculator\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/javascript-tutor.net\/index.php\/2016\/07\/17\/creating-simple-calculator\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/javascript-tutor.net\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Creating a Simple Calculator\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/javascript-tutor.net\/#website\",\"url\":\"https:\/\/javascript-tutor.net\/\",\"name\":\"Learn JavaScript Online | Free Interactive JavaScript Tutorials\",\"description\":\"Master JavaScript with free, interactive tutorials for beginners and experienced coders. Practice live coding and visualize how JavaScript works step by step.\",\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/javascript-tutor.net\/#\/schema\/person\/63d832c3efdf443517b5f5bfd1b93df8\",\"name\":\"Liew Voon Kiong\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/javascript-tutor.net\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/413ad70576fa5f43c1d3ae3429c92579c21f536c350e6470302fa25ddd9b6a13?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/413ad70576fa5f43c1d3ae3429c92579c21f536c350e6470302fa25ddd9b6a13?s=96&d=mm&r=g\",\"caption\":\"Liew Voon Kiong\"},\"url\":\"https:\/\/javascript-tutor.net\/index.php\/author\/ajt7051jct\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Creating a Simple Calculator - Learn JavaScript Online | Free Interactive JavaScript Tutorials","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/javascript-tutor.net\/index.php\/2016\/07\/17\/creating-simple-calculator\/","og_locale":"en_US","og_type":"article","og_title":"Creating a Simple Calculator - Learn JavaScript Online | Free Interactive JavaScript Tutorials","og_description":"We can create a simple calculator that adds two numbers. 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