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https://uva.onlinejudge.org/index.php?option=onlinejudge&page=show_problem&problem=2307
#include <iostream>
using namespace std;
int f(int n) {
int sum = 0;
while(n > 0) {
sum += n % 10;
n /= 10;
}
if(sum < 10)
return sum;
else
return f(sum);
}
int main() {
int n;
while(cin >> n && n)
cout << f(n) << endl;
return 0;
}
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