bitwise operators - What is the most portable way to get/set highest bit of an integer in GNU C -

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what portable way get/set highest bit of integer in gnu c?

this bloomberg interview question. didn't give best answer @ time. can answer it?

thanks

if type unsigned, it's easy:

(type)-1-(type)-1/2

for signed values, know no way. if find way, answer several unanswered questions on so:

c question: off_t (and other signed integer types) minimum , maximum values

is there way compute width of integer type @ compile-time?

maybe others.


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