Numbers can be reversed in Python using different methods. Like loop or Recursion can use to reverse a number in python. let us take a look at the Python program to implement the same.
Ways to reverse a number in Python
- Using a Loop
- Using Recursion
Python programs to reverse a number
Let’s see the both examples:
Reverse a Number(integer) using Loop
Example of reverse a user input Number using While loop:
num = int(input("Enter your number: "))
rev_num = 0
while (num > 0):
remainder = num % 10
rev_num = (rev_num * 10) + remainder
num = num // 10
# Display the result
print("The reverse number is : {}".format(rev_num))
Output:
Reverse a Number(integer) using Recursion
Python Program to Reverse a user given Number using Recursion.
Num = int(input("Please Enter any Number: "))
Result = 0
def Result_Int(Num):
global Result
if (Num > 0):
Reminder = Num % 10
Result = (Result * 10) + Reminder
Result_Int(Num // 10)
return Result
Result = Result_Int(Num)
print("Reverse of entered number is = %d" % Result)
Output:
Shortest Way
But it will not work with negative integer (numbers).
a = 123 print(int(str(a)[::-1]))
Output: 321
Do comment if you know any other method or doubts on this tutorial.
Note:
IDE: PyCharm 2020.1.1 (Community Edition)
macOS 10.15.4
Python 3.7
All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.