461. Hamming Distance

The Hamming distance between two integers is the number of positions at which the corresponding bits are different.

Given two integers x and y, calculate the Hamming distance.

Note:
0 ≤ x, y < 231.

Example: 

Input: x = 1, y = 4

Output: 2

Explanation:
1   (0 0 0 1)
4   (0 1 0 0)
       ↑   ↑

The above arrows point to positions where the corresponding bits are different.

461. Hamming Distance
struct Solution;

impl Solution {
    fn hamming_distance(x: i32, y: i32) -> i32 {
        let mut z = x ^ y;
        let mut sum = 0;
        for _ in 0..32 {
            sum += z & 1;
            z >>= 1;
        }
        sum
    }
}

#[test]
fn test() {
    assert_eq!(Solution::hamming_distance(1, 4), 2);
}