Well i was making a blackjack game and i got this error

Code:
 Linking...
Blackjack.obj : error LNK2019: unresolved external symbol "void __cdecl whoWins(int,int)" (?whoWins@@YAXHH@Z) referenced in function _main
Blackjack.obj : error LNK2019: unresolved external symbol "void __cdecl announceResult(bool,int)" (?announceResult@@YAX_NH@Z) referenced in function _main
Blackjack.obj : error LNK2019: unresolved external symbol "void __cdecl announceHand(int)" (?announceHand@@YAXH@Z) referenced in function "int __cdecl drawAndAddCardToHand(int,bool &)" (?drawAndAddCardToHand@@YAHHAA_N@Z)
Blackjack.obj : error LNK2019: unresolved external symbol "void __cdecl announceCard(int)" (?announceCard@@YAXH@Z) referenced in function "int __cdecl drawAndAddCardToHand(int,bool &)" (?drawAndAddCardToHand@@YAHHAA_N@Z)
C:\Documents and Settings\user\Desktop\Blackjack\Debug\Blackjack.exe : fatal error LNK1120: 4 unresolved externals
Build log was saved at "file://c:\Documents and Settings\user\Desktop\Blackjack\Blackjack\Debug\BuildLog.htm"
Blackjack - 5 error(s), 0 warning(s)
Any help would be great!
if you have any questions about this game ask!