# C Program to find the sum of the digits of a number using recursion function1 min read

This C program calculates the sum of digits of a given number using recursion. Here’s a concise explanation:

1. Function Definition: `sumDigits(int n)`
• This function calculates the sum of digits of a number `n`.
• The base case checks if `n` is 0. If true, it returns 0 (no digits to sum).
• Otherwise, it uses recursion by summing the last digit of `n` (obtained by `n % 10`) with the sum of the remaining digits (obtained by `sumDigits(n / 10)`).
2. Main Function: `main()`
• The main function begins the execution of the program.
• It declares two variables: `num` for user input and `result` to store the sum of digits.
• The user is prompted to enter a number, which is then stored in the variable `num`.
• The `sumDigits` function is called with `num` as an argument, and the result is stored in the `result` variable.
• The program prints the sum of digits.
3. Output:
• The program outputs the calculated sum of digits for the given input.

Output:

`Enter a number: 123 Sum of digits of a number: 6`

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