Eroare de compilare: user.cpp:2:1: error: ‘ifstream’ does not name a type ifstream f ("in.in"); ^~~~~~~~ user.cpp:3:1: error: ‘ofstream’ does not name a type ofstream g ( "out.out") ; ^~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:8:5: error: ‘f’ was not declared in this scope f >> n ; ^ user.cpp:9:5: error: ‘g’ was not declared in this scope g << n + 2 ; ^