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Question #131 Difficulty: 2

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

    #include <iostream>

class C {
public:
  explicit C(int) {
    std::cout << "i";
  }
  C(double) {
    std::cout << "d";
  }
};

int main() {
  C c1(7);
  C c2 = 7;
}

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