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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int num = 10, ans = 0;
  4. string s;
  5. int main(){
  6. 	cin >> s;
  7. 	while (num > 9){
  8. 		for (int i = 0; i < s.size(); i++){
  9. 			ans += s[i] - '0';
  10. 		}
  11. 		s = to_string(ans);
  12. 		num = ans;
  13. 		ans = 0;
  14. 	}
  15. 	cout << num;
  16. }
Success #stdin #stdout 0s 5308KB
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https://ideone.com/NTcSrl
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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