Sure, I can relate to that. In the early eighties computer magazines had huge listings of code which I dutifully typed in. They never worked worked first time

Sure, I can relate to that. In the early eighties computer magazines had huge listings of code which I dutifully typed in. They never worked worked first time as I'd invariably mistyped various characters, but the subsequent bug finding taught me about how the code worked. The bonus was you got a playable game at the end of it.