# Sum Of Digit Of A Number Using Recursion Through Python Programming

In this post, I will discuss Sum Of Digit Of A Number Using Recursion Through Python Programming.

Given a number, we need to find sum of its digits using recursion.

Examples:

``````Input : 12345
Output : 15

Input : 45632
Output :20``````

Now, the step by step process for a better understanding of how this algorithm works,

Lets, Take the example 12345

Step-1:

``12345 % 10 which is equal-too 5 + and then send 12345/10 to next step.``

Step-2:

``1234 % 10 which is equal-too 4 + and then send 1234/10 to next step.``

Step-3:

``123 % 10 which is equal-too 3 + and then send 123/10 to next step.``

Step-4:

``12 % 10 which is equal-too 2 + and then send 12/10 to next step.``

Step-5:

`` 1 % 10 which is equal-too 1 and then send 1/10 to next step.``

Step-6:

`` 0 algorithm stops.``

Here, following diagram will illustrate the process of recursion:

```# Recursive Python3 program to
# find sum of digits of a number

# Function to check sum of
# digit using recursion
def sum_of_digit( n ):
if n == 0:
return 0
return (n % 10 + sum_of_digit(int(n / 10)))

# Driven code to check above
num = 12345
result = sum_of_digit(num)
print("Sum of digits in",num,"is", result)

# This code is contributed by "Sharad_Bhardwaj".```

Output:

``Sum of digits in 12345 is 15``