How to Check Whether a Number is a Power of Two in Python

Submitted by razormist on Tuesday, April 8, 2025 - 22:25.

In this tutorial, we’ll learn how to program "How to Check Whether a Number is a Power of Two in Python." The objective is to accurately check if a given number is a power of two. This tutorial will guide you through the process step by step, helping you understand how to determine whether a number can be expressed as 2 raised to a certain power. By the end, you’ll have a clear understanding of how to efficiently perform this check in Python.

This topic is straightforward to understand. Just follow the instructions I provide, and you’ll complete it with ease. The program I’ll demonstrate will show you the correct and efficient way to check whether a number is a power of two. So, let’s dive into the coding process!

Getting Started:

First you will have to download & install the Python IDLE's, here's the link for the Integrated Development And Learning Environment for Python https://www.python.org/downloads/.

Creating Main Function

This is the main function of the application. The following code will display a simple GUI in terminal console that will display program. To do this, simply copy and paste these blocks of code into the IDLE text editor.

def is_power_of_two(n):
    if n <= 0:
        return False
    else:
        return n & (n - 1) == 0
 
while True:
    print("\n============= Check Whether a Number is a Power of Two =============\n")
 
 
    n = int(input('Enter a number: '))
 
    if is_power_of_two(n):
        print('{} is a power of two.'.format(n))
    else:
        print('{} is not a power of two.'.format(n))
 
    opt = input("\nDo you want to try again?(yes/no): ")
       
    if opt.lower() == 'yes':
        ret=False
    elif opt.lower() == 'no':
        ret=True
        print("Exiting program....")
    else:
        print("Please enter yes/no:")
        break
 
    if ret == False:
        continue

This program checks whether a given number is a power of two. It uses a bitwise trick: a number n is a power of two if n > 0 and n & (n - 1) == 0. The program runs in a loop, prompting the user for a number, checking the condition, and printing the result. It continues until the user chooses to exit.

Output:

There you have it we successfully created How to Check Whether a Number is a Power of Two in Python. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!

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