HWID protect

Hey! I already found the HWID in c++. But i dont know how to ask the program about this is a usable HWID or a not registered one. It's a long ass combination of numbers and letters. So i cant do If(Hwid != registered hwid) Exit() or something... So how? thank you guys for the help

1) do not paste if you cant figure it out
2) search... there are threads with ready2paste code

If there is an invalid and valid hwid code, take the hwid code that loads if it is a correct and put it where the the invalid hwid code is.