Everything in C is undefined behavior

The author argues that virtually all non-trivial C and C++ code contains undefined behavior (UB), making it nearly impossible to write truly correct programs in these languages. Beyond well-known issues like memory safety violations, subtle and often illogical sources of UB are pervasive—such as pointer alignment requirements and compiler assumptions—meaning programmers cannot reliably prevent UB regardless of their expertise. The author contends that given UB's ubiquity and the industry's repeated failures with these languages, it is unfair to blame individual programmers, and suggests that relying on C/C++ in modern environments may be problematic.