insert a number abc, receive output a+b+c; ( recursion)

#include <iostream>
using namespace std;

int sum(int x)
{
    if (x==0)
    {
        return 0;
    }
    else
    {
        return x%10 + sum(x/10);
    }
}

int main() {

    int x;
    cin >> x;
    cout << sum(x);

}