"Modern C" is a beginners book. "21st Century C" is for people who have learned C in the past but need to brush up their knowledge with modern practices. As s

"Modern C" is a beginners book. "21st Century C" is for people who have learned C in the past but need to brush up their knowledge with modern practices. As someone who learned C at the time of the first edition of the K&R, "21st Century C" would be more useful if I ever had to code in C again (which hopefully I won't). A refresh, 5 years later, would be useful, though.