Feb 24, 2025 · The task of summing the digits of a given number in Python involves extracting each digit and computing their total . For example , given the number 12345, the sum of its digits is 1 + 2 + 3 + 4 + 5 = 15.

For small numbers (fewer than 30 digits in length), use division and modulus: def sum_digits_math(n): r = 0 while n: r, n = r + n % 10, n // 10 return r For large numbers (greater than 30 digits in length), use the string domain: def sum_digits_str_fast(n): d = str(n) return sum(int(s) * d.count(s) for s in "123456789")

Aug 25, 2024 · Learn how to calculate the sum of digits of a number in Python using different methods like while loop, function, without loop and using recursion.

Oct 9, 2016 · I have written a Python function that takes an integer as input and returns the sum of all that number's digits: def digit_sum(n): n_lst = list( str(n) ) n_sum = 0 for i in range( len(...

Jul 15, 2015 · A simple recursive function for sum all the digits of a number is: def sum_digits(number): """ Return the sum of digits of a number.

Feb 7, 2025 · Given a number n, find the sum of its digits. Examples : The idea is to add the digits starting from the rightmost (least significant) digit and moving towards the leftmost (most significant) digit.

Python Program to Find Sum of Digits of a Number using Recursion. This program to find the sum of digits allows the user to enter any positive integer. Then, it divides the given integer into individual digits and adds those individual (Sum) digits by calling the function recursively.

Jul 6, 2021 · To get an integer quotient every time use "//". Step 1 - Define a function Sum with parameter n. Step 2 - Declare variable sum to store the sum of digits. Step 3 - Define a loop that will run till n is not 0. Step 4 - Add the sum variable to the remainder returned by (n%10) Step 5 - Update n to n//10. Step 6 - Take user input.

Dec 27, 2024 · Digit Sum Function: The dsum function calculates the sum of the digits of a given number. It initializes total to 0, then uses a while loop to add each last digit of val to total and removes the last digit from val until val is reduced to 0. The function returns total.

Mar 13, 2025 · In this tutorial, we will write a Python program to calculate the sum of digits of a given number. Extract the last digit using num % 10. Add it to the sum and remove the last digit using num //= 10. Repeat until all digits are processed. The result is the sum of all digits. Output. We can also solve this problem using recursion. Hey there!