JavaScript is one of mostly used scripting language all over the world. Today in this post we are going to see how to write a program to print Factorial values of a number using plain JavaScript.
Lets’ see the example (Find Factorial of a number using JavaScript):
<!DOCTYPE Html>
<html>
<head>
<title>Find factorial of a number using Javascript</title>
<script type="text/javascript">
function findFactorial(){
//clear the result div
document.getElementById("result").innerHTML = "";
var num = document.getElementById("number").value;
var fact = 1;
//loop till the iterator i equals to number
for (i = 1; i <= num; i++){
//formula to calculate factorial is to
//multiply the iterator i value with fact value.
fact = fact * i;
//put the below lines of code out of this 'for loop' to show only the total value
document.getElementById("result").insertAdjacentHTML('beforeend', '<br>');
document.getElementById("result").insertAdjacentHTML('beforeend', fact);
}
}
</script>
</head>
<body>
<h2>Find factorial of a number using Javascript</h2>
Enter Number: <input type="number" id="number" min="1" max="100" /><button onclick="findFactorial()">Calculate</button>
<div id="result"></div>
</body>
</html>
Output of the above program will be something like this:
You can see the demo of the above script here:
