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

Question

Aryan Kumar · Answer

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

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

I am writing code in “Python” language. Output:38 -14563289

Revati S Misra · Answer

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

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

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