Ele4ka(recursus)

#include <iostream>

using namespace std;

int F(int n) {
	if (n % 10 > 0) {
		return(n % 10);
	}
	if (n == 0) {
		return 0;
	}
	return F(n / 10);
}


int main()
{
	int p, q;
	int s = 0;
	cout << "Enter p and q" << endl;
	cin >> p >> q;
	while (p >=0 && q >=0)
	{
		for (int i = p; i <= q; i++) {
			s += F(i);
		}

		cout << "There is the sum " << s << endl;
		cin >> p >> q;
		s = 0;
	}

}