Will C reuse the memory of a local block var once it goes out of scope?

Question

(I believe this question is technically distinct from Can a local variable's memory be accessed outside its scope? because it is C instead of C++.)

I know that in C

Answer 1

It's undefined behavior. It may work on some architectures or operating systems, but don't count on it. An example of where it may work is Linux, with the red zone enabled.