Reverse a Number in Python
Python is an interpreted, high-level, general-purpose programming language with different applications. To learn the fundamental concepts of Python, there are some standard programs that would give you a brief understanding of all the concepts practically. Reverse a number in Python is one of these programs which gives the learner a deep understanding of loops and arithmetic operators. This article will help you understand and implement the ways to reverse a number. It will cover the following topics -
- How to reverse a number in Python?
- Python program to reverse a number
- Using loops
- Using recursion
How to reverse a number in Python?
It’s simple! You can write a Python program that takes an input number and reverse the same. The value of an integer is stored in a variable that is checked using a condition and then each digit of the number is stored in another variable, which will print the reversed number. Numbers can be reversed in Python using different methods, let us take a look at the Python program to implement the same.
Python program to reverse a number
There are two ways to reverse a number in Python programming language -
- Using a Loop
- Using Recursion
Reverse a Number using Loop
# Get the number from user manually
num = int(input("Enter your favourite number: "))
# Initiate value to null
test_num = 0
# Check using while loop
while(num>0):
#Logic
remainder = num % 10
test_num = (test_num * 10) + remainder
num = num//10
# Display the result
print("The reverse number is : {}".format(test_num))Output:
Program Explanation
User value: Number = 123456 and Reverse = 0
First Iteration
Reminder = Number %10
Reminder = 123456%10 = 6
Reverse = Reverse *10 + Reminder
Reverse = 0 * 10 + 6 = 0 + 6 = 6
Number = Number //10
Number = 123456 //10 = 12345
Sixth iteration
From the Second Iteration, the values of both Number and Reverse have been changed as Number = 1 and Reverse = 65432
Reminder = Number %10
Reminder = 1 %10 = 1
Reverse = Reverse *10+ Reminder = 65432 * 10 + 1
Reverse = 654320 + 1 = 654321
Number ended:
Reverse a Number using Recursion
# Python Program to Reverse a Number using RecursionNum = 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("n Reverse of entered number is = %d" %Result)
Output:
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Originally published at https://www.edureka.co on September 24, 2019.
