9 Palindrome Number

Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward.

Example 1:

Input:
 121

Output:
 true

Example 2:

Input:
 -121

Output:
 false

Explanation:
 From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.

Example 3:

Input:
 10

Output:
 false

Explanation:
 Reads 01 from right to left. Therefore it is not a palindrome.

Follow up:

Coud you solve it without converting the integer to a string?

Always forget to remember the original X

class Solution {
    public boolean isPalindrome(int x) {
        if (x < 0 ){
            return false;
        }
        int palind = x;
        int rev = 0;
        while (x > 0) {
            rev = rev * 10 + x % 10;
            x /= 10;
        }
        return palind == rev;
    }
}