How to make loop repeat until the sum is a single digit?

Question

Prompt: Write a program that adds all the digits in an integer. If the resulting sum is more than one digit, keep repeating until the sum is one digit. For example, the numb

Answer 1

You could utilize recursion.

Try this:

def sum_of_digits(n):
    s = 0

    while n:
        s += n % 10
        n //= 10

    if s > 9:
        return sum_of_digits(s)

    return s

n = int(input("Enter an integer: "))
print(sum_of_digits(n))