(e.g., screen readers), contact Pearson’s disability support – they provide legal DRM-free copies upon proof of need.
The legitimate 9th edition has no legal free PDF. Chapter 21 (C++ inheritance) is among the weakest in the book. If you found a file labeled "Deitel C How To Program 9th Edition Pdf 21", it's likely an illegally truncated or scanned version. Consider using the 10th edition (2015, updated for C11) or the official eText via Pearson+ if you need digital access. Deitel C How To Program 9th Edition Pdf 21