1. func isPalindrome(x int) bool {
    2.     if x < 0 || (x % 10 == 0 && x != 0) {
    3.         return false
    4.     }
    6.     revertedNumber := 0
    7.     for x > revertedNumber {
    8.         revertedNumber = revertedNumber * 10 + x % 10
    9.         x /= 10
    10.     }
    12.     return x == revertedNumber || x == revertedNumber / 10
    13. }