Palindrome Number Program In JavaScript

Palindrome Number Program In JavaScript is the today topic of discussion in this tutorial. Let’s say the number we want to check palindrome is 16461 There would be 5 iterations because the size of the number consists of 5 digits

Flowchart of Palindrome Number

flowchart of palindrom number javascript — **Figure:** Flowchart of palindrome number javascript

Begin

End After 5 iterations are completed the remainder is actually reversed number which is a palindrome. Note that the negative numbers are not a palindrome. A single-digit is also a palindrome because when a digit is reversed it remains the same.

Program of Palindrome In JavaScript

Program of Palindrome In JavaScript is mentioned below.

<!DOCTYPE html>
<html>
<head>
	<title>Palindrome</title>
</head>
<body style="margin: auto 0px; text-align: center;">
<h3>Enter Positive Integer Number</h3>
<input type="text" name="textbox" id="inputtxt" onkeyup="CheckPalindrome()">
<input type="button" value="Check" id="btn" onclick="CheckPalindrome()">
<h3 id="ans"></h3>
</body>
<script type="text/javascript">
	function CheckPalindrome()
	{
		var inputNumber = document.getElementById("inputtxt").value;
		if(isNaN(inputNumber))
		{
			document.getElementById("ans").innerHTML= "Wrong Input";
		}
		else
		{
		var holdNumber = inputNumber;
		var reverseNumber;
		var rem = 0;
		for(;inputNumber != 0;)
		{
		reverseNumber = parseInt(inputNumber % 10) ;
		inputNumber = parseInt(inputNumber / 10) ;
		rem = rem * 10 + reverseNumber ;
		reverseNumber = rem ;
	 	} 
	 	if(holdNumber == reverseNumber)
	 	document.getElementById("ans").innerHTML="Input Number Is Palindrome";
	 	else
	 	document.getElementById("ans").innerHTML="Input Number Is Not Palindrome";
	 	}
	}
</script>
</html>

<!DOCTYPE html>

<html>

<head>

<title>Palindrome</title>

</head>

<h3>Enter Positive Integer Number</h3>

</body>

function CheckPalindrome()

{

var inputNumber = document.getElementById("inputtxt").value;

if(isNaN(inputNumber))

{

document.getElementById("ans").innerHTML= "Wrong Input";

}

else

{

var holdNumber = inputNumber;

var reverseNumber;

var rem = 0;

for(;inputNumber != 0;)

{

reverseNumber = parseInt(inputNumber % 10) ;

inputNumber = parseInt(inputNumber / 10) ;

rem = rem * 10 + reverseNumber ;

reverseNumber = rem ;

}

if(holdNumber == reverseNumber)

document.getElementById("ans").innerHTML="Input Number Is Palindrome";

else

document.getElementById("ans").innerHTML="Input Number Is Not Palindrome";

}

</script>

</html>

Output

Pseudo Code of Palindrome Number Program In JavaScript

Display heading Enter a positive integer number Display a text box Display a Check button When user click Check button call function CheckPalindrome() In CheckPalindrome() function Declare a variable inputNumber Declare a variable holdNumber Declare a variable reverseNumber Declare a variable rem=0 for remainder initialized with value of 0 Assign value of textbox to inputNumber Put inputNumber value in holdNumber Run a for loop for(;inputNumber != 0;) { reverseNumber = parseInt(inputNumber % 10); inputNumber = parseInt(inputNumber / 10); rem = rem * 10 + reverseNumber; reverseNumber = rem; } if(holdNumber = = reverseNumber) Display, Input Number Is Palindrome in a heading of html tag h3 else Display, Input Number Is Not Palindrome in a heading of html tag h3

Palindrome Number Program In JavaScript
By: Prof. Dr. Fazal Rehman | Last updated: March 3, 2022