Check if a number is a palindrome in JavaScript
A number is a palindrome if it is written the same way after inverting it.
Example:
232, 191, 22022, 111, 666, 12012
Program Logic
- Get the number to check
- Keep the number in a temporary variable
- Reverse the number
- Compare the temporary number with the inverted number
- If the two numbers are the same, display “the number is a palindrome”
- Otherwise, display “the number is not a palindrome”
Program to check if a number is a palindrome in JavaScript
<!doctype html>
<html>
<head>
<script>
function isPalindrome()
{
var tmp=0, x, nbr, y;
nbr = Number(document.getElementById("MyInput").value);
y = nbr;
while(nbr > 0)
{
//Compare the first digit with the last digit
x = nbr%10;
nbr = parseInt(nbr/10);
tmp = tmp*10+x;
}
//Check whether tmp and y are the same or not.
if(tmp == y)
{
alert("The number is a palindrome.");
}
else
{
alert("The number is not a palindrome.");
}
}
</script>
</head>
<body>
Enter a number: <input id="MyInput">
<button onclick="isPalindrome()">Check</button>
</body>
</html>
| Result |
|---|
| Enter a number: |
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