Answer 1

Of course I can give you my code but I don't think that you would learn much.

Where do you need help? To get the sum of your input number? Or to understand what a harshad number is?

I would make a list what is needed:
1. User input --> how to get a number from the user?
2. How to get the sum of a number?
3. How to check if number and sum are divisible?
4. Print result --> divisible: harshad number, not divisible: no harshad number