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: ‘in’ was not declared in this scope user.cpp:10: error: expected ‘;’ before ‘)’ token user.cpp:48: error: ‘ofstream’ was not declared in this scope user.cpp:48: error: expected ‘;’ before ‘o’ user.cpp:49: error: ‘o’ was not declared in this scope user.cpp:4: warning: unused variable ‘fi’ user.cpp:4: warning: unused variable ‘fo’