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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.     int n,k,s;
  8.     cin>>n;
  9.     s=n;
  10.     while (s>9)
  11.     { k=s;s=0;
  12.     do 
  13.     {s=s+k%10;
  14.     k=k/10;}
  15.     while(k==0);
  16.     }
  17.     cout<< s;
  18.     return 0;
  19. }
Success #stdin #stdout 0s 15232KB
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https://ideone.com/ZxfIk8
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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