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#include <iostream> class A { public: int x; int f(); int g(int x); }; int A::f() { int x = 0; x++; return x; } int A::g(int x) { x++; return x; } int main() { A a; a.x = 0; std::cout << a.x << "\n"; std::cout << a.f() << "\n"; std::cout << a.x << "\n"; std::cout << a.g(1) << "\n"; std::cout << a.x << "\n"; }