Eroare de compilare: user.cpp:1:1: error: ‘include’ does not name a type include <fstream> ^ In file included from /usr/include/c++/4.8/iosfwd:40:0, from /usr/include/c++/4.8/ios:38, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:2: /usr/include/c++/4.8/bits/postypes.h:98:11: error: ‘ptrdiff_t’ does not name a type typedef ptrdiff_t streamsize; // Signed integral type ^ In file included from /usr/include/c++/4.8/exception:152:0, from /usr/include/c++/4.8/ios:39, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:2: /usr/include/c++/4.8/bits/exception_ptr.h:95:30: error: field ‘nullptr_t’ has incomplete type exception_ptr(nullptr_t) noexcept ^ /usr/include/c++/4.8/bits/exception_ptr.h:95:30: error: expected ‘;’ at end of member declaration /usr/include/c++/4.8/bits/exception_ptr.h:95:32: error: expected unqualified-id before ‘noexcept’ exception_ptr(nullptr_t) noexcept ^ In file included from /usr/include/c++/4.8/bits/move.h:57:0, from /usr/include/c++/4.8/bits/stl_pair.h:59, from /usr/include/c++/4.8/bits/stl_algobase.h:64, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:2: /usr/include/c++/4.8/type_traits:285:31: error: ‘std::size_t’ has not been declared template<typename _Tp, std::size_t _Size> ^ /usr/include/c++/4.8/type_traits:419:34: error: ‘nullptr_t’ is not a member of ‘std’ struct __is_nullptr_t_helper<std::nullptr_t> ^ /usr/include/c++/4.8/type_traits:419:34: error: ‘nullptr_t’ is not a member of ‘std’ /usr/include/c++/4.8/type_traits:419:48: error: template argument 1 is invalid struct __is_nullptr_t_helper<std::nullptr_t> ^ /usr/include/c++/4.8/type_traits:1239:32: error: ‘size_t’ is not a member of ‘std’ : public integral_constant<std::size_t, __alignof__(_Tp)> { }; ^ /usr/include/c++/4.8/type_traits:1239:32: note: suggested alternative: In file included from /usr/include/wchar.h:52:0, from /usr/include/c++/4.8/cwchar:44, from /usr/include/c++/4.8/bits/postypes.h:40, from /usr/include/c++/4.8/iosfwd:40, from /usr/include/c++/4.8/ios:38,