In this post I will discuss **Sum Of Digit Of A Number Using Recursion** through C 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 C program to find sum of digits // of a number #include <stdio.h> int sum_of_digit(int); // Driven Program to check above int main() { int num = 12345; int result = sum_of_digit(num); printf("Sum of digits in %d is %d\n", num, result); return 0; } // Function to check sum of digit using recursion int sum_of_digit(int n) { if (n == 0) return 0; return (n % 10 + sum_of_digit(n / 10)); }

**Output:**

`Sum of digits in 12345 is 15`

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