This isn’t a real update, but rather a piece of archiving.
Way back in 2012, John Regehr from the University of Utah wrote a rather (humbling) quiz on integers in C and undefined behavior. The quiz has been lost to time and WordPress and I decided to spend part of the holiday restoring it.
You can check it out here
https://www.acepace.net/integerQuiz/
For more about undefined behavior in C, check out his blog series
https://blog.regehr.org/archives/213
https://blog.regehr.org/archives/226
https://blog.regehr.org/archives/232