Main.cc: In function 'int main()': Main.cc:8:5: error: cannot bind 'std::istream {aka std::basic_istream}' lvalue to 'std::basic_istream&&' cout& std::operator>>(std::basic_istream<_CharT, _Traits>&&, _Tp&) [with _CharT = char; _Traits = std::char_traits; _Tp = std::basic_ostream]' operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x) ^