Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:8:24: error: invalid use of incomplete type ‘std::ifstream {aka class std::basic_ifstream<char>}’ ifstream ("ciur.in"); ^ In file included from /usr/include/c++/4.8/ios:38:0, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: /usr/include/c++/4.8/iosfwd:111:11: error: declaration of ‘std::ifstream {aka class std::basic_ifstream<char>}’ class basic_ifstream; ^ user.cpp:9:25: error: invalid use of incomplete type ‘std::ofstream {aka class std::basic_ofstream<char>}’ ofstream ("ciur.out"); ^ In file included from /usr/include/c++/4.8/ios:38:0, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: /usr/include/c++/4.8/iosfwd:114:11: error: declaration of ‘std::ofstream {aka class std::basic_ofstream<char>}’ class basic_ofstream; ^ user.cpp:11:5: error: ‘fin’ was not declared in this scope fin>>n; ^ user.cpp:16:5: error: ‘fout’ was not declared in this scope fout<<S; ^