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How to find the sum of each digit in a positive integer?

Ashutosh Patel111108-Feb-2023

How to find the sum of each digit in a given positive integer?

c#c# java programs 
Updated on 15-Jun-2023
Ashutosh Patel

Ashutosh Patel

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I am a software developer at MindStick soft. Pvt. ltd. I joined this company in august 2021 after completing my post-graduation course. I love to see the historical places of my country.

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3 Answers

Aryan Kumar

Aryan Kumar

15-Jun-2023

There are many ways to find the sum of each digit in a positive integer. Here are a few methods:

Method 1: Using a loop

  1. Initialize a variable to store the sum.
  2. Divide the integer by 10 repeatedly, and keep the remainder.
  3. Add the remainder to the sum.
  4. Repeat steps 2 and 3 until the integer is 0.
  5. Return the sum.

For example, to find the sum of the digits in the number 12345, we would do the following:

Code snippet

sum = 0
while 12345 > 0:
    sum += 12345 % 10
    12345 //= 10

This would give us a sum of 15.

Method 2: Using the sum() function

The sum() function in Python can be used to find the sum of a list of numbers. We can use this function to find the sum of the digits in a number by converting the number to a list of digits first.

For example, to find the sum of the digits in the number 12345, we would do the following:

Code snippet

sum_of_digits = sum(list(str(12345)))

This would give us a sum of 15.

Method 3: Using the reduce() function

The reduce() function in Python can be used to apply a function to all the elements of a list, and then return the result. We can use this function to find the sum of the digits in a number by using the sum() function as the function to apply.

For example, to find the sum of the digits in the number 12345, we would do the following:

Code snippet

sum_of_digits = reduce(sum, list(str(12345)))

This would give us a sum of 15.

Which method you use to find the sum of the digits in a positive integer depends on your personal preference and the programming language you are using.

Rahul Roi

Rahul Roi

10-Feb-2023

I am writing code in “Python” language.

def sum_of_digit(n):
    if(n<10):
        return n;
    return n % 10 + sum_of_digit(n//10);
print(sum_of_digit(14563289));
print(sum_of_digit(-14563289));

Output:
38

-14563289

Revati S Misra

Revati S Misra

09-Feb-2023

There is a following simple program to find the sum of each digit in a given positive integer,

 

using System;
namespace HelloWorld
{
  class Program
  {
    static void Main(string[] args)
    {
    Program.SumOfDigits(765);   
    }
   static void SumOfDigits(int num) 
    { 
        int sum = 0; 
        while (num > 0) 
        { 
            sum += num % 10; 
            num /= 10; 
        } 
        Console.WriteLine(sum); 
    }
  }
}

Output: 18
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