In file included from /usr/include/c++/3.2.2/backward/iostream.h:31, from ubuntzei.cpp:1: /usr/include/c++/3.2.2/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <sstream> instead of the deprecated header <strstream.h>. To disable this warning use -Wno-deprecated. ubuntzei.cpp:5: syntax error before `:' token ubuntzei.cpp:7: syntax error before `&' token ubuntzei.cpp:9: parse error before `:' token ubuntzei.cpp:14: parse error before `&' token ubuntzei.cpp:14: friend declaration not in class definition ubuntzei.cpp:14: `std::ostream& operator<<(...)' must have an argument of class or enumerated type ubuntzei.cpp:14: `std::ostream& operator<<(...)' must take exactly two arguments ubuntzei.cpp:19: parse error before `:' token ubuntzei.cpp:20: syntax error before `&' token ubuntzei.cpp:21:17: warning: no newline at end of file