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  1. #include <iostream>
  2. #include <cassert>
  3. using namespace std;
  4.  
  5.  
  6. int digital_sum(int n)
  7. {
  8.     if (n < 10)
  9.         return n;
  10.     return n % 10 +  digital_sum(n / 10);
  11.  
  12. }
  13.  
  14. int digital_root(int n)
  15. {
  16.         if(n < 10)
  17.         return n;
  18.     return (digital_root(digital_sum(n)));
  19. }
  20.  
  21.  
  22. int main() {
  23. 	// your code goes here
  24.  
  25. 	assert(digital_root(16) == 7);
  26.     assert(digital_root(195) == 6);
  27. 	assert(digital_root(992) == 2);
  28. 	assert(digital_root(167346) == 9);
  29. 	assert(digital_root(0) == 0);
  30.  
  31. 	std::cout<< "OP - huy" << std::endl;
  32. 	return 0;
  33. }
Success #stdin #stdout 0s 15232KB
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Standard input is empty
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OP - huy
https://ideone.com/c5QMqL
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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