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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int sumDigits(int n) {
  5.     while (n >= 10) {
  6.         int sum = 0;
  7.         while (n > 0) {
  8.             sum += n % 10;
  9.             n /= 10;
  10.         }
  11.         n = sum;
  12.     }
  13.     return n;
  14. }
  15.  
  16. int main() {
  17.     int n;
  18.     cin >> n;
  19.     cout << sumDigits(n) << endl;
  20.     return 0;
  21. }
  22.  
Success #stdin #stdout 0s 5276KB
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https://ideone.com/3Td45s
language:
C++14 (gcc 8.3)
created:
9 days ago
visibility:
public

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