public class Solution {
    /**
     * @param num a positive number
     * @return true if it's a palindrome or false
     */
    public boolean isPalindrome(int x) {
        if(x < 0) {
            return false;
        }
        return x == reverse(x);
    }

    public int reverse(int x) {
        int rst = 0;
        while(x != 0) {
            rst = rst * 10 + x % 10;
            x = x / 10;
        }
        return rst;
    }
}