Python Program To Reverse A Number

In this tutorial, we will see Python programs to reverse a number. For example, if the input is 95401, then the output should be 10459. We can apply multiple logics to reverse a number in Python. Following are the methods we are going to explore in this Python tutorial:

1. While loop
2. For loop
3. Recursion
4. String slicing
5. Reversed method

Also Read: Python Program to Find Sum of Digits [5 Methods]

Python Program To Reverse A Number Using While Loop

Code:

Num = 95401
ReverseNumber = 0

while Num != 0:
    digit = Num % 10
    ReverseNumber = ReverseNumber * 10 + digit
    Num //= 10

print("Reversed Number: " + str(ReverseNumber))

Output:

Also Read: Python Program To Check If A Number Is Perfect Square

Python Program to Reverse a Number Using For Loop

Code:

def reverse_for_loop(per):
  emptyString = ''
  for i in per:
    emptyString = i + emptyString
  return emptyString
num = '95401'
if __name__ == "__main__":
  print('Reversing the given number using for loop =', reverse_for_loop(num))

Output:

Also Read: Increment and Decrement Operators in Python

Python Program to Reverse a Number Using Recursion

Code:

def reverse(n, r):
    if n==0:
        return r
    else:
        return reverse(n//10, r*10 + n%10)

num = int(input("Enter number: "))

reverseNum = reverse(num,0)

print("Reverse of %d is %d" %(num, reverseNum))

Output:

Also Read: Python Dictionary Length [How To Get Length]

Python Program to Reverse a Number Using String Slicing

Code:

num = 95401
print(str(num)[::-1])

Output:

Also Read: How To Concatenate Arrays in Python [With Examples]

Python Program to Reverse a Number Using Reversed Method

Code:

def reverse(string): 
  string = "".join(reversed(string)) 
  return string 
num = "95401" 
print (num) 
print ("Reverse of the given number is : ",end="") 
print (reverse(num))

Output:

Also Read: What Does The Python Percent Sign Mean?

Python Program To Reverse A Number Using Function

Code:

def ReverseNum():
    Num = 95401
    ReverseNumber = 0
    while Num != 0:
        digit = Num % 10
        ReverseNumber = ReverseNumber * 10 + digit
        Num //= 10
    print("Reversed Number: " + str(ReverseNumber))

ReverseNum()

Output:

Also Read: How to Create an Empty Array In Python

Summary

In this Python tutorial, we explored how to reverse a number using various methods such as while loop, for loop, string slicing, recursion, and custom function.

Other related tutorials:

• What Is Python Used For? Applications of Python
• How To Display A Calendar In Python
• How To Sort a List of Tuples in Python
• Arithmetic Operators in Python [With Examples]
• How to Handle String Index Out of Range Error In Python