JavaScript Program to Check Palindrome Number
What is Palindrome Number?
A palindrome number is a number that remains the same when its digits are reversed. For example, 55 is a palindrome number.
Note: The reverse of 55 is also a 55. Hence, 55 is a palindrome number.
Tips: It is recommended to use our online Palindrome Numbers calculator for better understanding.
Check Palindrome Number
In the following example, we will check whether the given number (121) is a Palindrome number or not.
Example
<!DOCTYPE html>
<html>
<body>
<h1>JS Palindrome Number</h1>
<script>
var num = 121;
var copyNum = num;
var reverse = 0;
//reverse a number
while(copyNum != 0)
{
reverse = reverse * 10;
reverse = reverse + (copyNum % 10);
copyNum = Math.floor(copyNum / 10);
}
// result
if (num == reverse)
document.write(num +" is a palindrome number");
else
document.write(num +" is not a palindrome number");
</script>
</body>
</html>
Palindrome Numbers between the Given Range
In the following example, we will find all the Palindrome numbers between 10 and 50.
Example
<!DOCTYPE html>
<html>
<body>
<h1>JS Find All Palindrome Numbers</h1>
<script>
var start = 10;
var end = 50;
var copyNum = 0;
var reverse = 0;
var flag = 0;
document.write("Palindrome numbers between "+start+" to "+end+":<br>");
for(start = start; start <= end; start++)
{
copyNum = start;
reverse = 0;
// reverse a number
while(copyNum != 0)
{
reverse = reverse * 10;
reverse = reverse + (copyNum % 10);
copyNum = Math.floor(copyNum / 10);
}
// result
if((start == reverse) && (start != 0))
{
flag = 1;
document.write(start +", ");
}
}
if(flag == 0)
document.write("There is no palindrome number between the given range");
</script>
</body>
</html>
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