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~0(all bits set) is one's complement negative zero (or a trap representation). Sign/magnitude~0is a negative number with maximum magnitude.if (i!=0 && k/i>x)will never lead to a division by 0, which would not be guaranteed without short circuits; same forp==NULL || *p=='\0'). Then, C before 1978 K&R was not yet C but a development version of it, isn’t it? Finally, I do not get from your explanations why the designers dit chose ! an not ~~ (which was in fact the question that we had to answer). You just say they picked the first. But why?