Check palindrome number recursive method python
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tutorial: checking for palindrome numbers using recursion in python
a **palindrome** is a number (or a string) that remains the same when its digits are reversed. for example, `121`, `12321`, and `4444` are all palindromic numbers.
in this tutorial, we will learn how to check if a number is a palindrome using a recursive method in python.
understanding the recursive approach
recursion is a programming technique where a function calls itself to solve smaller sub-problems of the same type. to check if a number is a palindrome recursively, we can follow these steps:
1. convert the number to a string to easily access individual digits.
2. compare the first and last digits of the string.
3. if they are the same, recursively check the substring that excludes the first and last digits.
4. if they are not the same, the number is not a palindrome.
steps to implement the recursive palindrome check
1. **base case**: if the length of the string is 0 or 1, return `true` (an empty string or single character is a palindrome).
2. **check characters**: compare the first and last characters of the string.
3. **recursive call**: if they are the same, call the function recursively with the substring that excludes the first and last characters.
python code example
here is a python implementation of the recursive method to check if a number is a palindrome:
explanation of the code
1. **function `is_palindrome_recursive(num_str)`**: this function performs the actual palindrome check recursively.
- if the length of the string is 0 or 1, it returns `true`.
- it checks if the first character (`num_str[0]`) is equal to the last character (`num_str[-1]`). if not, it returns `false`.
- if they are equal, it calls itself with the substring that excludes these two characters.
2. **function `check_palindrome_number(num)`**: this helper function converts the number to a string and calls the recursive function.
3. **example usage**: we check if `12321` ...
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