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.

str_x = str(x)
for i in range(0,int(len(str_x)/2)):
  if str_x[i] != str_x[-i-1]:
    return False
return True

str_x = str(x)
return str_x == str_x[::-1]

if x<0:
  return False
temp_x = x;
palindromeNum = 0
while temp_x != 0:
  palindromeNum = palindromeNum*10 + temp_x%10
  temp_x /= 10
return palindromeNum == x

str_x = str(x)
str_y = ""
for i in str_x:
  str_y = i + str_y
return str_y == str_x