etutorialspoint
  • Home
  • PHP
  • MySQL
  • MongoDB
  • HTML
  • Javascript
  • Node.js
  • Express.js
  • Python
  • Jquery
  • R
  • Kotlin
  • DS
  • Blogs
  • Theory of Computation

Sum of n numbers in Python using while loop

In this post, you will learn how to find the sum of n natural numbers using a while loop in Python programming language. The while loop in Python is used to iterate over a block of code as long as the truth expression (condition) is true.





In the given example, we have used the if..else statement in combination with a while loop to calculate the sum of n numbers. First, we have taken a number input from the user and stored it in a variable num. Initially, the sum is initialized to 0. The while loop is then used to iterate until the num equals zero. In every iteration of the loop, we have added the num to the sum, and the value of the num is decreased by 1.





# Sum of natural numbers up to num

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

if num < 0:
   print("Please enter a positive number")
else:
   sum = 0
   
   # use while loop to iterate until zero
   while(num > 0):
       sum += num
       num -= 1
   print("The result is", sum)
Output1 of the above code:
Enter a number: 15
The result is 120

The above example shows the sum of the first 15 positive numbers (0-15).


Output2 of the above code:
Enter a number: 22
The result is 253




Related Articles

Print first 10 natural numbers using while loop
Find square of a number in Python
Generate random numbers in Python
Sum of even numbers in Python
Swapping of two numbers in Python
Find average of n numbers in Python
Python program to print all even numbers between 1 to 100
Sum of n numbers in Python using while loop
Python program to list even and odd numbers of a list
Python program to print odd numbers within a given range
Python program to multiply two numbers
Program to find area of triangle in Python
Find area of rectangle in Python
Swapping of two numbers in Python
Find average of n numbers in Python
Print multiplication table in Python
Python program to multiply two matrices
Python program to find area of circle
Python iterate list with index
Python add list to list
Python random choice
Python dict inside list
Count consonants in a string Python
Convert array to list Python




Most Popular Development Resources
Retrieve Data From Database Without Page refresh Using AJAX, PHP and Javascript
-----------------
PHP Create Word Document from HTML
-----------------
How to get data from XML file in PHP
-----------------
PHP code to send email using SMTP
-----------------
Hypertext Transfer Protocol Overview
-----------------
How to encrypt password in PHP
-----------------
Characteristics of a Good Computer Program
-----------------
Create Dynamic Pie Chart using Google API, PHP and MySQL
-----------------
PHP MySQL PDO Database Connection and CRUD Operations
-----------------
Splitting MySQL Results Into Two Columns Using PHP
-----------------
Dynamically Add/Delete HTML Table Rows Using Javascript
-----------------
How to get current directory, filename and code line number in PHP
-----------------
How to add multiple custom markers on google map
-----------------
Fibonacci Series Program in PHP
-----------------
Get current visitor\'s location using HTML5 Geolocation API and PHP
-----------------
Submit a form data using PHP, AJAX and Javascript
-----------------
How to Sort Table Data in PHP and MySQL
-----------------
Simple star rating system using PHP, jQuery and Ajax
-----------------
How to generate QR Code in PHP
-----------------
jQuery loop over JSON result after AJAX Success
-----------------
Simple pagination in PHP
-----------------
Recover forgot password using PHP7 and MySQLi
-----------------
PHP Server Side Form Validation
-----------------
PHP MYSQL Advanced Search Feature
-----------------
Simple way to send SMTP mail using Node.js
-----------------
PHP user registration and login/ logout with secure password encryption
-----------------
Simple PHP File Cache
-----------------
PHP Secure User Registration with Login/logout
-----------------
jQuery File upload progress bar with file size validation
-----------------
Simple File Upload Script in PHP
-----------------
Php file based authentication
-----------------
Calculate distance between two locations using PHP
-----------------
PHP User Authentication by IP Address
-----------------
To check whether a year is a leap year or not in php
-----------------
How to print specific part of a web page in javascript
-----------------
Simple Show Hide Menu Navigation
-----------------
Detect Mobile Devices in PHP
-----------------
PHP Sending HTML form data to an Email
-----------------
Polling system using PHP, Ajax and MySql
-----------------
Google Street View API Example
-----------------
SQL Injection Prevention Techniques
-----------------
Get Visitor\'s location and TimeZone
-----------------
Driving route directions from source to destination using HTML5 and Javascript
-----------------
Convert MySQL to JSON using PHP
-----------------
Preventing Cross Site Request Forgeries(CSRF) in PHP
-----------------
Set and Get Cookies in PHP
-----------------
PHP Programming Error Types
-----------------
CSS Simple Menu Navigation Bar
-----------------
Date Timestamp Formats in PHP
-----------------
How to add google map on your website and display address on click marker
-----------------
How to select/deselect all checkboxes using Javascript
-----------------
Write a python program to print all even numbers between 1 to 100
-----------------
How to display PDF file in web page from Database in PHP
-----------------
PHP Getting Document of Remote Address
-----------------
File Upload Validation in PHP
-----------------


Most Popular Blogs
Most in demand programming languages
Best mvc PHP frameworks in 2019
MariaDB vs MySQL
Most in demand NoSQL databases for 2019
Best AI Startups In India
Kotlin : Android App Development Choice
Kotlin vs Java which one is better
Top Android App Development Languages in 2019
Web Robots
Data Science Recruitment of Freshers - 2019


Interview Questions Answers
Basic PHP Interview
Advanced PHP Interview
MySQL Interview
Javascript Interview
HTML Interview
CSS Interview
Programming C Interview
Programming C++ Interview
Java Interview
Computer Networking Interview
NodeJS Interview
ExpressJS Interview
R Interview


Popular Tutorials
PHP Tutorial (Basic & Advance)
MySQL Tutorial & Exercise
MongoDB Tutorial
Python Tutorial & Exercise
Kotlin Tutorial & Exercise
R Programming Tutorial
HTML Tutorial
jQuery Tutorial
NodeJS Tutorial
ExpressJS Tutorial
Theory of Computation Tutorial
Data Structure Tutorial
Javascript Tutorial






Learn Popular Language

listen
listen
listen
listen
listen

Blogs

  • Jan 3

    Stateful vs Stateless

    A Stateful application recalls explicit subtleties of a client like profile, inclinations, and client activities...

  • Dec 29

    Best programming language to learn in 2021

    In this article, we have mentioned the analyzed results of the best programming language for 2021...

  • Dec 20

    How is Python best for mobile app development?

    Python has a set of useful Libraries and Packages that minimize the use of code...

  • July 18

    Learn all about Emoji

    In this article, we have mentioned all about emojis. It's invention, world emoji day, emojicode programming language and much more...

  • Jan 10

    Data Science Recruitment of Freshers

    In this article, we have mentioned about the recruitment of data science. Data Science is a buzz for every technician...

Follow us

  • etutorialspoint facebook
  • etutorialspoint twitter
  • etutorialspoint linkedin
etutorialspoint youtube
About Us      Contact Us


  • eTutorialsPoint©Copyright 2016-2023. All Rights Reserved.