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Which of these expressions will isolate the rightmost set bit?

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+2 votes
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in C++ by (98.8k points)
Which of these expressions will isolate the rightmost set bit?

(a) x = x & (~x)

(b) x = x ^ (~x)

(c) x = x & (-x)

(d) x = x ^ (-x)

The question was posed to me in examination.

My doubt is from Integer Types topic in division Types, Pointers, Arrays & Structures in C++ of C++

1 Answer

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Best answer
Correct option is (c) x = x & (-x)

The best explanation: Negative of a number is stores as 2;s complement in C++, so when you will take AND of x and (-x) the rightmost digit will be preserved.

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