Eroare de compilare: user.cpp:3:1: error: invalid suffix "using" on floating constant user.cpp:3: error: expected unqualified-id before numeric constant 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:17: error: ‘g’ was not declared in this scope