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  1. #include <iostream>
  2.  
  3. int main(){
  4.     int a, sum;
  5.     sum = 0;
  6.  
  7.     std::cin >> a;
  8.  
  9.     if(a<10){
  10.     	sum+=a;
  11.     }
  12.     else{
  13.     	while(a>9 || a%10==0){
  14.     		sum+=a%10;
  15.         	a=a/10;
  16.     	}
  17.     }
  18.  
  19.     std::cout << sum << "\n";
  20. }
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/knessO
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
public

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