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Question #191 Difficulty: 2

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

    #include<iostream>

namespace A{
  extern "C" int x;
};

namespace B{
  extern "C" int x;
};

int A::x = 0;

int main(){
  std::cout << B::x;
  A::x=1;
  std::cout << B::x;
}

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