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Question #49 Difficulty: 2

According to the C++17 standard, what is the output of this program? 

    #include <iostream>

class C {
public:
  C(int i) : i(i) { std::cout << i; }
  ~C() { std::cout << i + 5; }

private:
  int i;
};

int main() {
  const C &c = C(1);
  C(2);
  C(3);
}

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