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  1. #include <iostream>
  2.  
  3. int main()
  4. {
  5. int a=0, x=0;
  6. do{
  7. std::cin>>a;
  8. x+=a;
  9. }while(a!=0);
  10. std::cout<<x;
  11. }
Success #stdin #stdout 0s 3300KB
stdin
2
3
4
0
stdout
9