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This question was too similar to http://cppquiz.org/quiz/question/160. Aside from that, it's a good question, I just had to retract one of them.

Question #189 Difficulty: 2

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

    #include <iostream>

struct A {
  virtual int fn(int i = 5) const { return i + 1; }
};

struct B : A {
  virtual int fn(int i = 7) const override { return i + 2; }
};


void run(const A& a) {
  std::cout << a.fn(1) << a.fn();
}

int main() {
  run(B());
}

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