Machine Problem in AngularJS

Write a program that will ask the user to give a number, and then the program will compute the factorial value of the given number by the user.

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Program Listing

<!-- index.htm
  Author   : Prof. Jake Rodriguez Pomperada, MAED-IT, MIT
  Date     : July 20, 2021  Tuesday   10:12 PM
  Place    : Bacolod City, Negros Occidental
  Websites : www.jakerpomperada.com and www.jakerpomperada.blogspot.com
  Email    : jakerpomperada@gmail.com
 -->
<html ng-app="mainApp">
<head>
	<title>Factorial a Number in AngularJS</title>
</head>
<style>
body {
	font-family: arial;
	font-size: 25px;
	font-weight: bold;
}
</style>
<script type="text/javascript" src="angular.min.js">
</script>

<script type="text/javascript">

// AngularJS Controller Declaration

var app = angular.module('mainApp', [])
  .controller('Factorial_Controller', function($scope) {
  })
  
  .filter('factorial', function() {
    return    function factorial(n) {
      return n === 0 ? 1 : n * factorial(n - 1);
    }

  });

</script>

<div ng-app="app" ng-controller="Factorial_Controller">
	<form>
	<table border="0" cellspacing=10>
	<tr>Factorial a Number in AngularJS</tr>
	<tr>
	<td>Enter a Number </td>
	<td><input type="number" ng-model="val_1" ng-init="val_1=0"/></td>
	</tr>
	<table>
	</form>
	<p>The factorial value of {{val_1}} is {{val_1 | factorial}}. </p>
</div>
</body>
</html>

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