Leetcode Q191：Number of 1 Bits
2015-07-27 21:23
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题目191：
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
so the function should return 3.
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.
int hammingWeight(uint32_t n)
{
int count = 0;
while(n)
{
count++;
n = n & (n-1);
}
return count;
}
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