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.
public class Solution {
// you need to treat n as an unsigned value
public int hammingWeight(int n) {
int num = 0;
String s1 = Integer.toBinaryString(n);
for(int i = s1.length()-1;i>=0;i--)
if(s1.charAt(i)=='1')
num++;
return num;
}
}