Eroare de compilare: user.cpp:1:21: error: fstream.h: No such file or directory user.cpp: In function ‘void back(int)’: user.cpp:12: warning: name lookup of ‘j’ changed user.cpp:4: warning: matches this ‘j’ under ISO standard rules user.cpp:7: warning: matches this ‘j’ under old rules user.cpp: In function ‘int main()’: user.cpp:28: error: ‘ifstream’ was not declared in this scope user.cpp:28: error: expected ‘;’ before ‘f’ user.cpp:29: error: ‘ofstream’ was not declared in this scope user.cpp:29: error: expected ‘;’ before ‘g’ user.cpp:31: error: ‘f’ was not declared in this scope user.cpp:36: error: ‘g’ was not declared in this scope