&quot;This claim that positive signed overflow wraps around is neither correct by the C standard nor consistent with the observed behavior of either GCC or LLVM. This isn’t an acceptable claim to make in a popular C-based textbook published in 2015.&quot;<p>Perhaps someone could explain what I&#x27;m missing. It&#x27;s <i>exactly</i> the behavior that I see using gcc-4.8 and Apple llvm-7.3.