One of the best explanations available on how to use macros and conditional compilation to write portable code.

for (init; condition; increment) // code to execute while condition is true

Deep dives into how stdio actually works, covering buffered vs. unbuffered I/O.

If Kochan's Programming in C is the "What," Topics in C Programming is the It turns a coder into a systems programmer by teaching the relationship between the language and the machine.

One of the distinguishing features of this text is its deep dive into the Preprocessor, a tool often glossed over in beginner books.

What makes this section special is the “why.” They show a simple program that works fine as a single file, then systematically break it into three files, explaining each compilation error and how to resolve it using scope rules.