Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:4:1: error: ‘f’ was not declared in this scope f.open("adunare.in",ios::in) ^ user.cpp:4:21: error: ‘ios’ has not been declared f.open("adunare.in",ios::in) ^ user.cpp:5:1: error: expected ‘;’ before ‘g’ g.open("adunare.out",ios::out) ^ user.cpp:9:1: error: ‘g’ was not declared in this scope g<<s; ^ user.cpp:11:1: error: expected ‘;’ before ‘g’ g.close() ^