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Question #163 Difficulty: 1

According to the C++23 standard, what is the output of this program? 

    #include <iostream>

class A {
  int foo = 0;

public:
  int& getFoo() { return foo; }
  void printFoo() { std::cout << foo; }
};

int main() {
  A a;

  auto bar = a.getFoo();
  ++bar;

  a.printFoo();
}

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