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: x = 121
Output: true

Example 2:

Input: x = -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: x = 10
Output: false
Explanation: Reads 01 from right to left. Therefore it is not a palindrome.

Example 4:

Input: x = -101
Output: false

Constraints:

In [1]:

def is_palindrome(x):
    pass

In [2]:

is_palindrome(121)

In [3]:

is_palindrome(-121)

In [4]:

is_palindrome(10)

In [5]:

is_palindrome(-101)

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

In [6]:

from math import log10

def is_palindrome(x): 
    """Don't convert 'x' into a string."""
    pass

In [7]:

is_palindrome(121)

In [8]:

is_palindrome(-121)

In [9]:

is_palindrome(10)

In [10]:

is_palindrome(-101)