Eroare de compilare: user.cpp:1:21: error: iostream.h: No such file or directory user.cpp:2:20: error: fstream.h: No such file or directory user.cpp: In function ‘void back(int)’: user.cpp:10: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp: In function ‘int main()’: user.cpp:23: error: ‘ifstream’ was not declared in this scope user.cpp:23: error: expected ‘;’ before ‘fin’ user.cpp:24: error: ‘fin’ was not declared in this scope user.cpp:27: error: ‘ofstream’ was not declared in this scope user.cpp:27: error: expected ‘;’ before ‘fout’ user.cpp:28: error: ‘fout’ was not declared in this scope