Python Program to Find Sum of Digit of a Number using Recursion

   January 21, 2023

Method 1: Using the divide method 

def sum_of_digit( n ):
	if n == 0:
		return 0
	return (n % 10 + sum_of_digit(int(n / 10)))


num = int(input("Enter the number whose sum of digits you want:"))
result = sum_of_digit(num)
print("Sum of digits of number",num,"is", result, "using recursion")

Output:

Enter the number whose sum of digits you want:3692
Sum of digits of number 3692 is 20 using recursion

Explanation:

Here we will be using conditional for checking that if the number is 0 then its sum will also be zero and so we checked whether n is equal to zero or not. If it is not, then we first divided our number will 10 and then added that with the output of the sum_of_digit() function. The call to this function again simply means that it is a recursive approach to solving this problem. Now, this function will again be called and the output of that will be added to the previously computed value in such a way it will continue till the number n is equal to zero. Now the final computed value is returned back and printed.

This is the one method to solve this problem recursively. Do share yours if you have any.

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Author: Ayush Purawr