Eroare de compilare: user.cpp:2:20: error: fstream.h: No such file or directory user.cpp: In function ‘int main()’: user.cpp:8: error: variable ‘std::ifstream in’ has initializer but incomplete type user.cpp:9: error: variable ‘std::ofstream out’ has initializer but incomplete type user.cpp:12: error: ‘f’ was not declared in this scope user.cpp:19: error: ‘g’ was not declared in this scope user.cpp:8: warning: unused variable ‘in’ user.cpp:9: warning: unused variable ‘out’