Programiz
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Python Program to Reverse a Number
Python range() Function · To understand this example, you should have the knowledge of the following Python programming topics: Python for Loop · Python while Loop · num = 1234 reversed_num = 0 while num != 0: digit = num % 10 reversed_num = reversed_num * 10 + digit num //= 10 print("Reversed Number: " + str(reversed_num)) Output · 4321 · In this program, while loop is used to reverse a number as given in the following steps: First, the remainder of the num divided by 10 is stored in the variable digit.
GeeksforGeeks
geeksforgeeks.org › python › python-program-to-reverse-a-number
Python Program to Reverse a Number - GeeksforGeeks
November 18, 2025 - This method reverses the number by converting it to a string, slicing it in reverse order and converting it back to an integer. ... This method extracts digits from the end of the number using % 10 and builds the reversed number digit-by-digit.
Can I reverse a negative number in Python using a for loop?
Yes, you can handle negative numbers by first converting the number to a string, excluding the negative sign, reversing the digits, and reapplying the negative sign to the result.
upgrad.com
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How to Reverse a Number in Python: 5 Smart Ways with Code
How can I reverse a number in Python using a for loop?
You can reverse a number in Python using a for loop by converting the number to a string, iterating over the digits in reverse order, and then converting the reversed sequence back to an integer.
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How to Reverse a Number in Python: 5 Smart Ways with Code
Why should I learn how to reverse a number in Python for loop?
Learning this technique enhances your understanding of loops, string manipulation, and number processing, which are essential skills in Python programming.
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How to Reverse a Number in Python: 5 Smart Ways with Code
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Tutorial Gateway
tutorialgateway.org › python-program-to-reverse-a-number
Python Program to Reverse a Number
April 7, 2025 - Within this program, When it reaches the rev = rev_Integer (num) line in the program, the compiler immediately jumps to the below function: ... The last line ends with a return Reverse statement.
Upgrad
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How to Reverse a Number in Python: 5 Smart Ways with Code
November 11, 2024 - You can reverse a number in Python ... The simplest way is to use a for loop combined with slicing or the reversed() function to iterate through the digits in reverse and construct the reversed number....
PYnative
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Python Reverse a Number [4 Ways] – PYnative
March 31, 2025 - num = 123456 reversed_int = 0 negative = num < 0 num = abs(num) while num != 0: reversed_int = reversed_int * 10 + num % 10 # Extract the last digit and append it to the reversed number num //= 10 # Remove the last digit if negative: reversed_int = -reversed_int # Restore sign if negative print('Reversed Integer:', reversed_int) # Output: # Reversed Integer: 654321Code language: Python (python) Run · Recursion is a method where a function calls itself to break down a problem into smaller subproblems. To reverse an integer recursively, we use the same mathematical formula discussed in the above approach, where we extract digits one by one and construct the reversed number in each recursive call.
datagy
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Python: Reverse a Number (3 Easy Ways) • datagy
December 20, 2022 - Because of this, we can turn our code into a function that makes it clear what our code is hoping to accomplish. Let’s take a look at how we can accomplish this in Python: def reverse_number(number): """Reverses a number (either float or int) ...
EDUCBA
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Reverse Number in Python | Top12 Methods of Reverse Number in Python
April 17, 2023 - Reverse() method is the straightforward method for performing this operation for any kind of input provided by the user. ... Valuation, Hadoop, Excel, Mobile Apps, Web Development & many more.
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Python Guides
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How To Reverse A Number In Python?
March 20, 2025 - Args: number: The number to reverse Returns: The reversed number """ # Handle negative numbers is_negative = number < 0 number = abs(number) # Convert to string for digit extraction digits = [int(d) for d in str(number)] # Use reduce to build the reversed number reversed_num = reduce(lambda acc, digit: acc * 10 + digit, digits[::-1], 0) return -reversed_num if is_negative else reversed_num # Example original_number = 987654 reversed_number = reverse_number_functional(original_number) print(f"Original: {original_number}, Reversed: {reversed_number}") # Output: Original: 987654, Reversed: 456789
Scaler
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Reverse a Number in Python - Scaler Topics
June 21, 2024 - In this method, we utilize the ... get reversed. So, we just add the digits of our number into a list using the list() function in Python, then use the reverse method on it to get the digits in reverse order and then by using the join() method, we obtain the final reversed ...
Newtum
blog.newtum.com › reverse-a-number-in-python-using-for-loop
Reverse a Number in Python Using For Loop - Newtum
October 14, 2024 - Yes, alternative approaches include converting the number to a string, using slicing or the reversed() function to reverse the string representation, and converting it back to an integer.
w3resource
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Python: Reverse the digits of a given number and add it to the original - w3resource
... # Function to reverse a number and add it to the original number until a palindrome is obtained def rev_number(n): s = 0 # Initialize a variable to count the number of iterations while True: k = str(n) # Convert the number to a string for ...
Reddit
reddit.com › r/learnpython › can anyone explain how to reverse a integer number?
r/learnpython on Reddit: Can anyone explain how to reverse a integer number?
February 1, 2022 -
Sorry if that sound like stupid, I'm just a newbie to programming
At first I thought it was easy and started writing code and I find myself with bunch of errors.
Then I came up with this:
number = 12345 reverse = str(number)[::-1] print(reverse)
It's just cheating you can say, I converted integer into string and made that string reverse.
After a while I thought, I'm just stupid to code like this but then later I googled and I found this solution which is more complicated to understand:
number = 12345 reverse = 0 while number > 0: last_digit = number % 10 reverse = reverse * 10 + last_digit number = number // 10 print(reverse)
Can anyone please explain what's going on here?
Top answer 1 of 15
50
That's hardly cheating, and is now I'd do it unless that method was explicitly forbidden (I had that once). Your div/mod way is more complicated, and in my experience, likely doesn't have much in the way of noticeable performance advantages anyway. Abusing strings is often a good solution surprisingly (but consider each case individually).
2 of 15
23
It's also worth noting they are not the same. Because your method not only returns a string, it also evaluates the reverse as a string. e.g. number = 12340 #Notice the number ends in 0 string result is: '04321' integer result is: 4321
WsCube Tech
wscubetech.com › resources › python › programs › reverse-number
Reverse a Number in Python (5 Different Ways)
October 29, 2025 - Explore 5 different ways to reverse a number in Python. Get step-by-step code examples, outputs, and clear explanations to enhance your understanding.
Vultr
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Python Program to Reverse a Number | Vultr Docs
December 9, 2024 - This recursive function continues to call itself, each time reducing the number by a factor of ten and adjusting the reversed number accordingly. The recursion stops when the number becomes zero, and at this point, the completely reversed number is returned. Reversing a number in Python can be achieved through multiple approaches, each with its unique style and use case.
NxtWave
ccbp.in › blog › articles › reverse-a-number-in-python
Reverse a Number in Python: Methods & Best Practices
On the other hand, mathematical operations provide a more algorithmic approach to manipulating digits instead of converting the number to a string. In addition, Python has built-in options like the reversed() function or the use of list slicing, ...
PREP INSTA
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Reverse of a number in Python | PrepInsta
July 29, 2023 - To know more about recursion, check out our page Recursion in Python. Given an integer input number, we perform the following, Define a recursive function recursum() that takes in number and reverse variable as arguments.
CodeScracker
codescracker.com › python › program › python-program-find-reverse-of-number.htm
Python Program to Reverse a Number
Now this program uses list to reverse a given number. The append() is used to add or append new element (number here) at the end of list. print("Enter a Number: ", end="") num = int(input()) temp = num nums = [] while num!=0: rem = num nums.append(rem) num = int(num/10) print(end="\nReverse of " +str(temp)+ " is ") for i in range(len(nums)): print(nums[i], end="") print() This program uses a user-defined function named rev(), that returns reverse of a number passed as its argument.
Top answer 1 of 16
19
Without converting the number to a string:
def reverse_number(n):
r = 0
while n > 0:
r *= 10
r += n % 10
n /= 10
return r
print(reverse_number(123))
2 of 16
9
You are approaching this in quite an odd way. You already have a reversing function, so why not make line just build the line the normal way around?
def line(bottles, ending):
return "{0} {1} {2}".format(bottles,
plural("bottle", bottles),
ending)
Which runs like:
>>> line(49, "of beer on the wall")
'49 bottles of beer on the wall'
Then pass the result to reverse:
>>> reverse(line(49, "of beer on the wall"))
'llaw eht no reeb fo selttob 94'
This makes it much easier to test each part of the code separately and see what's going on when you put it all together.
GitHub
gist.github.com › hossainlab › b58bd9b22dfeb5eeedba4ee37c007946
Python Program To Reverse a Given Number - Gist - GitHub
... n = int(input("Enter a number: ")) reversed_number = 0 while(n>0): last_digit = n reversed_number = reversed_number*10+last_digit n = n//10 print("The reversed number is: ",reversed_number)
Stack Overflow
stackoverflow.com › questions › 65640864 › how-to-reverse-a-given-number-in-python-using-just-for-loop
How to reverse a given number in python using just for loop - Stack Overflow
i did it in while loop but couldn't do it in for loop my code using while loop : x=int(input("enter a number: ")) i=0 while(x>0): remainder=x i=(i*10)+remainder x//=10 p...