Jan 2, 2012

K & R C Programs Exercise 2-9.

K and R C, Solution to Exercise 2-9:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition) You can learn and solve K&R C Programs Exercise.
In C two complement number system, x &= (x-1) deletes the rightmost one bit in x.
We take (x-1) and add 1 to it to produce x. The rightmost 0-bit of x-1 changes to 1 in the result x. Therefore, the rightmost 1-bit of x has a corresponding 0-bit in x-1. This is why x & (x-1), in a two's complement number system, will delete the rightmost 1-bit in x. Read more about C Programming Language .

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int bitcount(unsigned x)
{
	int b;
	for(b = 0;x != 0;x &= x-1)
		++b;
	return b;
}
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