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[Rratic]

You wrote

Computing the NOT of a single value is also easy:

printf("%1$255d%1$s%hhn", a, b)

will compute

*b = (strlen(a)+255)%256 = strlen(a)-1

and again, because strlen(x) is either 1 or 0 we have

*c = !b

Well,in *c=!b ,where does c come from? Do you mean *b=!a ?