Eroare de compilare in evaluator: user.cpp:1:2: error: invalid preprocessing directive #using user.cpp: In function 'int main()': user.cpp:5: error: 'ifstream' was not declared in this scope user.cpp:5: error: expected `;' before 'f' user.cpp:6: error: 'f' was not declared in this scope user.cpp:8: error: 'ofstream' was not declared in this scope user.cpp:8: error: expected `;' before 'g' user.cpp:9: error: 'g' was not declared in this scope