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Reversing Numbers in Python: A Simple Program and Explanation

Introduction:

Reversing a number is a common programming task that involves rearranging the digits of a number in reverse order. In this article, we'll explore a simple Python program to reverse a given number and provide a detailed explanation of the code.

### Python Program to Reverse a Number:

```python

def reverse_number(number):

    reversed_num = 0

    while number > 0:

        digit = number % 10

        reversed_num = reversed_num * 10 + digit

        number = number // 10

    return reversed_num

# Example: Reversing a number

input_number = int(input("Enter a number: "))

result = reverse_number(input_number)

print("Reversed number:", result)

```

### Explanation:

#### 1. Function Definition (`reverse_number`):

   - The `reverse_number` function takes an integer `number` as an argument and returns the reversed number.

#### 2. Initialization:

   - `reversed_num` is initialized to 0, which will store the reversed number.

   - The `while` loop runs as long as the original number (`number`) is greater than 0.

#### 3. Reversing the Number:

   - Inside the loop:

     - `digit` is the last digit of the original number (`number % 10`).

     - The last digit is added to the `reversed_num` after multiplying it by 10 and adding the current digit.

     - The last digit is removed from the original number (`number // 10`).

#### 4. Returning the Result:

   - Once the loop completes, the reversed number is returned.

#### 5. User Input and Output:

   - The user is prompted to enter a number using `input()`.

   - The entered number is converted to an integer using `int()`.

   - The `reverse_number` function is called with the input number, and the result is printed.

### Sample Output:

```

Enter a number: 12345

Reversed number: 54321

```

### Conclusion:

Reversing a number in Python is a straightforward task that involves extracting the digits of the original number one by one and constructing the reversed number. The provided program demonstrates a simple and efficient way to achieve this using a `while` loop. Understanding such basic operations is fundamental to building more complex algorithms and solving a variety of programming problems. Feel free to explore variations of this program and adapt it to suit different requirements in your projects. Happy coding!