Question

I have an integer value (ex: 723) and i want to add up all the values in this integer until i get a single value.

ex: 7 + 2 + 3 = 12
    1 + 2     = 3

I’m new to C#. please give me a good explanation of your answer as well 🙂

Answer 1

int i = 723;
int acc;
do {
    acc = 0;
    while (i > 0)
    {
        acc += i % 10;
        i /= 10;
    }
    i = acc;
} while(acc>=10);

% 10 gives the final digit each time, so we add that into an accumulator. /= 10 performs integer division, essentially removing the final digit each time. Then we repeat until we have a small enough number.