How to reverse number in python python interview questions

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reversing a number is a common interview question in python and can be approached in various ways. below, i'll provide a detailed tutorial on how to reverse a number, along with explanations and code examples.

### tutorial: reversing a number in python

#### method 1: using string manipulation

one of the simplest ways to reverse a number is to convert it to a string, reverse the string, and convert it back to an integer.

**code example:**
**explanation:**
1. convert the number to a string using `str(num)`.
2. reverse the string using slicing `[::-1]`.
3. convert the reversed string back to an integer using `int()`.
4. return the reversed number.

#### method 2: using mathematical operations

you can also reverse a number without converting it to a string by using mathematical operations.

**code example:**
**explanation:**
1. initialize `reversed_num` to 0.
2. check if the number is negative, and if so, store that information and work with its absolute value.
3. use a `while` loop to extract digits from the number:
- `digit = num % 10` gets the last digit.
- update `reversed_num` by multiplying it by 10 and adding the digit.
- `num //= 10` removes the last digit.
4. return the reversed number, restoring the negative sign if necessary.

#### method 3: using recursion

another interesting way to reverse a number is by using recursion.

**code example:**
**explanation:**
1. this function takes two arguments: the number to be reversed and the current reversed number.
2. in the base case, if `num` is 0, return `reversed_num`.
3. otherwise, extract the last digit and update `reversed_num`.
4. call the function recursively with the number divided by 10.

### conclusion

reversing a number in python can be accomplished in multiple ways: through string manipulation, mathematical operations, or recursion. each method has its advantages, and understanding them can help you tackle similar problems during interviews.

#### practice questions:
1. modify the s ...

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