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Recursive digit sum python

# Recursive digit sum python

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Mar 20, Code cleanup. Mar 3, Fix permissions on euler Solve exception. Mar 23, Apr 23, Solve gaming laptop battery life. Mar 8, Solve permutations.Python list is one of the very useful data types in Python. Python list is nothing but an array of elements. As we are interested to calculate the sum of the elements, we are considering all the elements in the list as numbers. Problem Statement: Write a Python program to find the sum of all elements in the List.

We can calculate the sum of all the elements in the Python list, using a simple building function sum. Many times, in interviews, you will ask to write your own Python program to calculate the sum of all the elements using recursion. You can not use any built-in function. The code is self-explanatory. The only thing is that you should have a good understanding of how recursion work. This problem was asked in McAfee coding round.

To use the reduce method you have to import functools module in your Python program. Lambda is a special anonymous function. You can read more about the lambda function in Python. This program has more complexity. As we are traversing each element and calling recursive function, it takes time O n.

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As we are using recursion here, it requires extra memory to save the output from previous recursive calls. This is a simple tutorial with a Python program to find the sum of all elements in the list. If you are beginners, I would recommend solving coding interview questions for practicing.

Save my name, email, and website in this browser for the next time I comment. What do you want to Learn Today? Code Python. Table of Contents. Aniruddha Chaudhari. I am complete Python Nut, love Linux and vim as an editor. I keep sharing my coding knowledge and my own experience on CSEstack Portal.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. A digital root is the recursive sum of all the digits in a number. Given n, take the sum of the digits of n. If that value has more than one digit, continue reducing in this way until a single-digit number is produced. This is only applicable to the natural numbers. My approach is here.

Any tips on how to properly return correct value? I would appreciate any help. The main problem is that, when doing the recursive calls, you're not assigning the return value to anything, so you'll always get 0 for any value that requires more than one pass.

Also, after the recursive call, the length should be 1 so the following elif is not necessary and will cause incorrect return values since it won't be assigning s to answ. This is a cleaner way for recursion using some built in python functions:. The part sum map int,sn means: map function,iterable applies the int -function to all characters in sn strings are iterable which is the string of your number.

Then it sum s it up and calls itself with that sum. Here is my take on it. I felt the urge to use sum but that almost feels like cheating since you could just use sum [int i for i in str n ]. With recursive functions, it's generally a good idea to start with the most basic case and then incrementally add complexity.

Additionally, a trick that's useful is that taking list of a string cuts the string into characters, ergo list "abc" returns ["a", "b", "c"].

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Learn more. Asked 3 days ago. Active 2 days ago. Viewed 55 times. I am stuck in this exercise. Task: A digital root is the recursive sum of all the digits in a number. TrebledJ 5, 4 4 gold badges 17 17 silver badges 38 38 bronze badges. New contributor. Active Oldest Votes. Patrick Artner Pages Home core java thread java 8 array coding string sql books j2ee oop collections data structure interview certification.

## Python Program to Find the Sum of Digits of a Number

How to calculate Sum of Digits using Recursion in Java. In the first partwe have solved this problem without using recursion i. It's good to know different approaches to solving the same problem, this will help you to do well on coding interviews. While finding a recursive algorithm, always search for a base case, which requires special handling. Once you find the base case, you can easily code the method by delegating rest of processing to the method itself, i.

In this problem, the base case is when the number becomes zero, at that time our program is complete and we return the sum of digits of given number. Another property of a recursive algorithm is that with each passing steps your program approaches to result and problems become shorter.

For example in this coding problem, after each call, one digit from the number is reduced. So if you provide 5 digit number then it will require five steps to complete. One key thing you need to know to solve this problem is the trick to get the last digit of an integral number. Sum of Digits of a Number using Recursion Here are my complete solution and code sample to solve this problem.

I am using the main method to test the code but I encourage you to write JUnit test to test your code. Using unit tests to check your program is a good development practice, initially, it takes some time but once you get used to it, it's a cake walk.

This is my personal experience that writing JUnit test triggers your thought process and think through ability, which eventually results in better code.

### Common examples of loops using recursion in Python

In this example, we are also using two methods to implement the recursive algorithm, a common practice. Since sometimes recursive method carries the current state of the program in function parameters itself, it's better to write a public method to accept input from the client and a private method to do the work.

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## Sum of digit of a number using recursion

Anonymous January 14, at AM. Newer Post Older Post Home. Subscribe to: Post Comments Atom.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

However its only give the proper sum of 2 digit numbers. How can i get the sum of any number. Also would my function count as recursion. Recursion is a way of programming or coding a problem, in which a function calls itself one or more times in its body. Usually, it is returning the return value of this function call. If a function definition fulfils the condition of recursion, we call this function a recursive function.

A recursive function has to terminate to be used in a program.

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Usually, it terminates, if with every recursive call the solution of the problem is downsized and moves towards a base case. A base case is a case, where the problem can be solved without further recursion. For this problem, the "base case" is:. For a function to be recursive, it must call itself within itself.

Furthermore, since your current one does not do this, it is not recursive. While recursion is a clever way to go, I'd generally stay away from it for performance and logic reasons it can get complex pretty quick.

I know it's not the answer you are looking for but I'd personally stick to something like this or some kind of loop:. Learn more. Recursion function to find sum of digits in integers using python Ask Question.

Asked 6 years, 5 months ago. Active 3 years, 5 months ago. Viewed 21k times.Please Login in order to post a comment. Can someone provide explaination as to what "return x if x else 9 " is doing? I understand it is returning the output, but I do not understand the logic of how because how does the proram know when to return '9' versus 'x'?

I don't like the categorization of this problem as recursion. This modulus solution is great, but it's a little misleading to ask you to write it recursively when this solution is so much more elegant. Then i tried using a custom memo, it still failed those test cases by exceeding recursion limit. Could you elaborate a bit. This seems awesome. I just wanted to know why you used n.

You'll see that the solutions are multiples of one another, except for when it is 10 which results in having to sum up the integers. Singhalr31 Well, based on the comments from swapnilsingh : "It's not really working for all of the test cases. Can any one help me to check the issue.

### Common examples of loops using recursion in Python

All of your doubts will be cleared. I mean doesn't it cross integer limits? This is not a case for recursion at all. The below code in Java will solve without any recursion being used. However, it is prudent to use a simple recursion since this logic with BigInteger uses additional memory, the recursion is known to invert memory in a stack, but in this case it converges soon, so the memory of the stack is low.

With recursion in Java. I don't understand the objections to recursion. It is good practice for logical thinking. This works for all test cases, congrats. Since the problem demands recursion, your answer is correct.

ToString ; How did you figure out to multiply the sum instead of multiplying the text first? How does that not affect the outcome? Nice solution! Keeping the string as such seems to provide a big performance boost, than casting it to BigInteger. Can you explain why you have done -'0'? We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.In this post, we will discuss how to write a python program to find the sum of digits of a number.

Let's discuss these ways one by one. Here, we take the remainder of the number by dividing it by 10 then change the number to the number with removing the digit present at the unit place. We repeat this process in the while loop. And in every iteration, we sum up the remainder till the number becomes 0. We can decrease the number of code lines by replacing the statements present in the body of while loop with just one statement. Look in the code I have put the one line statement code in the comment.

In this, we will take the number as a string and then by using for loop we traverse through every digit and add it up to the sum. In this, we will define a recursive function getDigitSum.

Sum of digits in a number in python

This function will return the sum of the digits. Tags: number Program python Recursion string. February 5, February 4, May 24, Python Programs. Python Program to Print the Fibonacci Sequence 2 ways. How-To Java. How to make a new project in Eclipse IDE. Ping Pong Game. BreakOut Game. Skip to content Python Programs. For example. You can learn about many other Python Programs Here. The following two tabs change content below.

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