void setup() : The initialization routine that runs once when the board powers up.
(Ch4 debounceless version)
So is almost certainly a scanned or DRM-stripped PDF of the 4th edition, bundled optionally with code examples or tools. AppNee.com.Getting.Started.With.Arduino.4th.Edi...
If you want to narrow down your focus or get specific help, tell me: void setup() : The initialization routine that runs
The "AppNee.com." prefix in your search points to appnee.com , a website that historically has offered free downloads of commercial software, ebooks, and other digital content. While it might appear to be a convenient source, a closer look reveals significant concerns. AppNee.com.Getting.Started.With.Arduino.4th.Edi...
The most reliable way to get the 4th edition is through legal channels. You can purchase the physical or ebook from: