Example: Sum of Digits of a Number in C using While loop

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

// It's the main function of the program
int main()
{
    int num, sum = 0, mod;

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

    // Step-2 Iterate over the input number to get each digit and make the sum of each digit
    while (num > 0)
    {
        mod = num % 10;
        sum += mod;
        num = num / 10;
    }

    // Step-3 Final output of the program
    printf("\nOutput: %d", sum);
    return 0;
}