1> All output are the latest,
1> Flight. Obj: error LNK2019: cannot resolve the external symbol of "class STD: : basic_ostream & lt; Char, struct STD: : char_traits & lt; char> & __cdecl operator<& lt; (class STD: : basic_ostream & lt; Char, struct STD: : char_traits & lt; char> & , the class Time const & amp;) "(?????? 6 @ YAAAV? $basic_ostream @ DU? @ STD @ @ @ $char_traits @ D STD @ @ AAV01 @ ABVTime @ @ @ Z), the symbol in the function "class STD: : basic_ostream & lt; Char, struct STD: : char_traits & lt; char> & __cdecl operator<& lt; (class STD: : basic_ostream & lt; Char, struct STD: : char_traits & lt; char> & The class Flight const & amp;) "(?????? 6 @ YAAAV? $basic_ostream @ DU? @ STD @ @ @ $char_traits @ D STD @ @ AAV01 @ ABVFlight @ @ @ Z) referenced
1> E: \ \ the final curriculum design code Minghang \ Debug \ Minghang exe: fatal error LNK1120: one cannot resolve the external command
1>
1> Generate failure,