Eroare de compilare: user.cpp:3:18: error: conio.h: No such file or directory user.cpp:4:20: error: fstream.h: No such file or directory user.cpp: In function ‘void df(int)’: user.cpp:13: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:23: error: variable ‘std::ifstream in’ has initializer but incomplete type user.cpp:24: error: variable ‘std::ofstream out’ has initializer but incomplete type user.cpp:42: error: ‘getch’ was not declared in this scope