Machine Problem

Write a program that uses a controller that will ask the user to give four numbers and then the program will compute the total sum of the four numbers, and display the results on the screen.

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Program Listing
<!-- index.htm
  Author   : Prof. Jake Rodriguez Pomperada, MAED-IT, MIT
  Date     : August 11, 2021  11:56 AM Wednesday
  Place    : Bacolod City, Negros Occidental
  Websites : and
  Email    :

      <title>Addition of Four Numbers Using Controllers in AngularJS</title>
     <script type="text/javascript" src="angular.min.js"></script>
        var myApp=angular.module("myModule",[]);
        myApp.controller("Sum_Values",function($scope) {
          let sum = 0;

          $scope.sum = ($scope.a + $scope.b + $scope.c + $scope.d);

          $scope.sum = "The total sum is " + $scope.sum + ".";

          $scope.a = "";
          $scope.b = "";
          $scope.c = "";
          $scope.d = "";
          $scope.sum = "";
body {
  font-family: arial;
  font-size: 25px;
  font-weight: bold;
 <body ng-app="myModule" ng-controller="Sum_Values">
   <h3>Addition of Four Numbers Using Controllers in AngularJS
  <table border="0">
      Enter Your First Number
         <input type="number" ng-model="a"/>
      Enter Your Second Number
         <input type="number" ng-model="b"/>
      Enter Your Third Number
         <input type="number" ng-model="c"/>
      Enter Your Fourth Number
         <input type="number" ng-model="d"/>
         <td colspan="10">
           <input type="button" ng-click="Sum_All();"
           <input type="button" ng-click="Clear_All();"