Leetcode: 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.
注意两点:1. 我用的 rightshift 是>>>, 是unsigned right shift
2. & 的优先级不如 ==, 所以要把&的两个参数括起来
1 public class Solution { 2 // you need to treat n as an unsigned value 3 public int hammingWeight(int n) { 4 int count = 0; 5 for (int i=0; i<32; i++) { 6 if ((n>>>i & 1) == 1) count++; 7 } 8 return count; 9 } 10 }