Eroare de compilare: user.cpp:1:19: error: Fstream: No such file or directory user.cpp:9: error: 'ifstream' does not name a type user.cpp:10: error: 'ofstream' does not name a type user.cpp: In function 'void prefix()': user.cpp:17: error: 'strlen' was not declared in this scope user.cpp: In function 'int main()': user.cpp:44: error: 'fin' was not declared in this scope user.cpp:49: error: 'fout' was not declared in this scope user.cpp:52: error: 'fout' was not declared in this scope