Palindrome Number

Clarify the problem:

• The problem requires determining whether a given integer is a palindrome.
• A palindrome number is a number that reads the same backward as forward.
• We need to implement a function that takes an integer as input and returns a boolean indicating whether it is a palindrome.

Analyze the problem:

• Input: An integer.
• Output: A boolean indicating whether the integer is a palindrome.
• Constraints:
  • The input integer can be negative, but negative numbers are not considered palindromes.

Design an algorithm:

• We can convert the integer to a string and check if the string is a palindrome.
• To check if a string is a palindrome, we can compare the characters from the beginning and the end of the string.
• We will use two pointers, one starting from the beginning of the string and the other starting from the end.
• We will compare the characters at the two pointers and move them towards the center until they meet or cross each other.
• If all the characters match, the string is a palindrome. Otherwise, it is not.

Explain your approach:

• We will implement a function called isPalindrome that takes an integer as input.
• We will convert the integer to a string using the built-in str() function.
• We will initialize two pointers, left and right, pointing to the beginning and the end of the string, respectively.
• We will compare the characters at the two pointers using string indexing.
• If the characters match, we will move left one step forward and right one step backward.
• We will continue this process until left is greater than or equal to right.
• If all the characters match, we will return True indicating that the integer is a palindrome. Otherwise, we will return False.

Write clean and readable code:

python

def isPalindrome(x):
    if x < 0:
        return False

    # Convert integer to string
    s = str(x)

    left = 0
    right = len(s) - 1

    while left < right:
        if s[left] != s[right]:
            return False
        left += 1
        right -= 1

    return True

Test your code:

python

# Test case 1
x = 121
# The number 121 is a palindrome.
assert isPalindrome(x) == True

# Test case 2
x = -121
# Negative numbers are not palindromes.
assert isPalindrome(x) == False

# Test case 3
x = 10
# The number 10 is not a palindrome.
assert isPalindrome(x) == False

# Test case 4
x = 12321
# The number 12321 is a palindrome.
assert isPalindrome(x) == True

Optimize if necessary:

• The provided solution already has a simple and efficient algorithm for determining whether an integer is a palindrome.
• There is no further optimization possible for this problem.

Handle error cases:

• The given code assumes that t