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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	unsigned int n;
  6. 	cout << "enter a non-negative integer: ";
  7. 	cin >> n;
  8.  
  9. 	while (n >= 10) {
  10. 		unsigned int sum = 0;
  11. 		unsigned int temp = n;
  12.  
  13. 		while (temp > 0) {
  14. 			sum += temp % 10;
  15. 			temp = temp / 10;
  16. 		}
  17.  
  18. 		cout << sum << endl;
  19. 		n = sum;
  20. 	}
  21. 	return 0;
  22. }
Success #stdin #stdout 0.01s 5324KB
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Standard input is empty
stdout
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enter a non-negative integer: 22
4
https://ideone.com/kNLQ6X
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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