Question

In: Computer Science

<!DOCTYPE html> <html> <head> <!-- *************************************************************************************** --> <!-- * * --> <!-- * Do not change...

<!DOCTYPE html>

<html>

<head>

<!-- *************************************************************************************** -->

<!-- * * -->

<!-- * Do not change anything within the <head></head> section of the HTML * -->

<!-- * * -->

<!-- *************************************************************************************** -->

<meta charset="utf-8">

<meta name="viewport" content="width=device-width, initial-scale=1">

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>

<style> .btn{border:1px solid black; padding:5px;display:inline-block} </style>

</head>

<body>

<!-- *************************************************************************************** -->

<!-- * * -->

<!-- * Nothing to change here in the <body> * -->

<!-- * * -->

<!-- *************************************************************************************** -->

<h1>Count of Magic numbers</h1>

<p>Enter a number x. Click calculate to determine the number of magic numbers between 1 and x (inclusive).</p>

<p>Your number: <input type="text" id="textEntered1"></p>

<p><input type="button" class="btn btn-primary" id="btn_1" value="Calculate"></p>

<div id="textDisplayed1"></div>

</body>

<script>

//


function isMagicNumber(x) {

////////////////////////////////////////////////////////////////////////////////

// Insert your code between here and the next comment block. Do not alter //

// any code in any other part of this file. //

////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////////

// Insert your code between here and the previous comment block. Do not alter //

// any code in any other part of this file. //

/////////////////////////////////////////////////////////////////////////////////

}


function getCount(x) {

////////////////////////////////////////////////////////////////////////////////

// Insert your code between here and the next comment block. Do not alter //

// any code in any other part of this file. //

////////////////////////////////////////////////////////////////////////////////

var numbers = "";

for(var i = 1; i<x; i++)

{

if(isMagicNumber(i))

{

numbers += "" + i + ",";

}

}

return numbers;

/////////////////////////////////////////////////////////////////////////////////

// Insert your code between here and the previous comment block. Do not alter //

// any code in any other part of this file. //

/////////////////////////////////////////////////////////////////////////////////

}



$("#btn_1").click(function(){

var x = $('#textEntered1').val();

$("#textDisplayed1").html(getCount(x));

});

</script>

</html>

Solutions

Expert Solution

Code changes and relevant comments have been added in bold.

<!DOCTYPE html>

<html>

<head>

<!-- *************************************************************************************** -->

<!-- * * -->

<!-- * Do not change anything within the <head></head> section of the HTML * -->

<!-- * * -->

<!-- *************************************************************************************** -->

<meta charset="utf-8">

<meta name="viewport" content="width=device-width, initial-scale=1">

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>

<style> .btn{border:1px solid black; padding:5px;display:inline-block} </style>

</head>

<body>

<!-- *************************************************************************************** -->

<!-- * * -->

<!-- * Nothing to change here in the <body> * -->

<!-- * * -->

<!-- *************************************************************************************** -->

<h1>Count of Magic numbers</h1>

<p>Enter a number x. Click calculate to determine the number of magic numbers between 1 and x (inclusive).</p>

<p>Your number: <input type="text" id="textEntered1"></p>

<p><input type="button" class="btn btn-primary" id="btn_1" value="Calculate"></p>

<div id="textDisplayed1"></div>

</body>

<script>

//

function isMagicNumber(x) {

var sum = 0;
  
//magic number is when a digits of a number are added till the point, sum becomes a single digit number and sum is equal to 1
while (x > 0 || sum > 9)
{
if (x == 0)
{
x = sum;
sum = 0;
}
sum += x % 10;
x /= 10;
}
  
// returning true if sum is equal 1.
return (sum == 1);

}

function getCount(x) {

var numbers = "";

for(var i = 1; i<x; i++)

{

if(isMagicNumber(i)) //Checking if number is magic or not

{

numbers += "" + i + ","; // The magic number will be added one by one separated by comma(',')

}

}

return numbers; // The number will be returned as 10,19,28, if the input is 30 for instance.

}


$("#btn_1").click(function(){

var x = $('#textEntered1').val();

$("#textDisplayed1").html(getCount(x));

});

</script>

</html>

venereology answered 3 years ago
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