Example: Sum of Digits of a Number in C using Function

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// Sum of Digits of a Number in C using Function
#include <stdio.h>

// Function to make sum of each digits
int sum_of_digits(int num)
{
    int sum = 0, mod;

    while (num > 0)
    {
        mod = num % 10;
        sum += mod;
        num = num / 10;
    }
    return sum;
}

// It's the main function of the program
int main()
{
    int num;

    // Step-1 Enter a Number
    printf("Enter Number: ");
    scanf("%d", &num);

    // Step-2 Call the sum_of_digits() function to get the sum of each digits
    // & print the final output of the program
    printf("\nOutput: %d", sum_of_digits(num));

    return 0;
}