Hello All, I was writing a program and ran across this error:

error LNK2019: unresolved external symbol "double __cdecl setTotalCost(vo id)" (?setTotalCost@ @YANXZ) referenced in function _main
1>c:\users\rafa el jr\documents\vi sual studio 2010\Projects\I nventory CS226\Debug\Inv entory CS226.exe : fatal error LNK1120: 1 unresolved externals

Can anyone please tell me where my error is or what i'm doing wrong?...