What do these errors mean?
main.obj : error LNK2001: unresolved external symbol "public: __thiscall Weekly::Weekly(void)" (??0Weekly@@QAE@XZ)
main.obj : error LNK2001: unresolved external symbol "public: __thiscall Daily::Daily(void)" (??0Daily@@QAE@XZ)
main.obj : error LNK2001: unresolved external symbol "public: __thiscall Onetime::Onetime(void)" (??0Onetime@@QAE@XZ)
Daily.obj : error LNK2001: unresolved external symbol "private: static int Daily::num_of_Dappointments" (?num_of_Dappointments@Daily@@0HA)
Debug/Proj5B.exe : fatal error LNK1120: 4 unresolved externals
Error executing link.exe.
If necessary, I can put up some scource code, but there are 13 diffrent files, and I have not a clue where the error is.