UVa/11332 - Summing digits/11332.cpp

   1 #include <iostream>
   2 using namespace std;
   3
   4 int main(){
   5  unsigned int n;
   6  while (cin >> n && n)
   7    cout << (n%9>0 ? n%9 : 9) << endl;
   8  return 0;
   9 }