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Question #198 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;
}

Answer:

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