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 ‘in’ user.cpp:7: error: ‘ofstream’ was not declared in this scope user.cpp:7: error: expected ‘;’ before ‘out’ user.cpp:10: error: ‘in’ was not declared in this scope user.cpp:16: error: ‘out’ was not declared in this scope user.cpp:8: warning: unused variable ‘sd’ user.cpp:8: warning: unused variable ‘ss’