JavaScript: Calculate multiplication and division of two numbers

Last update on May 30 2022 10:01:53 (UTC/GMT +8 hours)

JavaScript Basic: Exercise-10 with Solution

Write a JavaScript program to calculate multiplication and division of two numbers (input from user).

Sample Form:

Pictorial Presentation:

JavaScript: Calculate multiplication and division of two numbers

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html> 
<head>
<meta charset=utf-8 />
<title>JavaScript program to calculate multiplication and division of two numbers </title>
<style type="text/css">
body {margin: 30px;}
</style> 
</head>
<body>
<form>
1st Number : <input type="text" id="firstNumber" /><br>
2nd Number: <input type="text" id="secondNumber" /><br>
<input type="button" onClick="multiplyBy()" Value="Multiply" />
<input type="button" onClick="divideBy()" Value="Divide" />
</form>
<p>The Result is : <br>
<span id = "result"></span>
</p>
</body>
</html>

JavaScript Code:

function multiplyBy()
{
        num1 = document.getElementById("firstNumber").value;
        num2 = document.getElementById("secondNumber").value;
        document.getElementById("result").innerHTML = num1 * num2;
}

function divideBy() 
{ 
        num1 = document.getElementById("firstNumber").value;
        num2 = document.getElementById("secondNumber").value;
document.getElementById("result").innerHTML = num1 / num2;
}

Explanation:

document.getElementById(id).value: The value property sets or returns the value of the value attribute of a text field.

document.getElementById("result").innerHTM : The innerHTML property sets or returns the HTML content (inner HTML) of an element.

ES6 Version:

function multiplyBy()
{
        num1 = document.getElementById("firstNumber").value;
        num2 = document.getElementById("secondNumber").value;
        document.getElementById("result").innerHTML = num1 * num2;
}

function divideBy() 
{ 
        num1 = document.getElementById("firstNumber").value;
        num2 = document.getElementById("secondNumber").value;
document.getElementById("result").innerHTML = num1 / num2;
}

Live Demo:

See the Pen Javascript: multiplication and division of two numbers - basic - ex-10 by w3resource (@w3resource) on CodePen.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());

Ref: https://bit.ly/2BXbp04