Important reminder just in the Preface :-)
Takeaway #1: "C and C++ are different: don’t mix them, and don’t mix them up"
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For example, the primary reason for the sentence seems to be from the text: "Many code examples in this book won't even compile on a c++ compiler, So we should not mix sources of both languages".
It's not at all about the ability to use c libraries in c++ projects or vice versa :S.... c'mon guys!