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Number of 1 Bits

Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight).

For example, the 32-bit integer ’11' has binary representation 00000000000000000000000000001011, so the function should return 3.

Credits: Special thanks to @ts for adding this problem and creating all test cases.


一个数x与x-1的与运算,就是把最低位的1置0。即 x & (x - 1)会把最低位的1置0。


int hammingWeight(uint32_t n)
		int sum = 0;
		while (n) {
			n &= (n - 1);
		return sum;
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