Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:29: error: ‘ifstream’ was not declared in this scope user.cpp:29: error: expected ‘;’ before ‘f’ user.cpp:30: error: ‘ofstream’ was not declared in this scope user.cpp:30: error: expected ‘;’ before ‘g’ user.cpp:31: error: ‘f’ was not declared in this scope user.cpp:35: error: ‘g’ was not declared in this scope user.cpp:37: error: ‘g’ was not declared in this scope