Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:6: error: ‘ifstream’ was not declared in this scope user.cpp:6: error: expected ‘;’ before ‘f’ user.cpp:7: error: ‘ofstream’ was not declared in this scope user.cpp:7: error: expected ‘;’ before ‘g’ user.cpp:8: error: ‘f’ was not declared in this scope user.cpp:18: error: ‘g’ was not declared in this scope