题解 | #查找输入整数二进制中1的个数#【右移】

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextInt()) {
            System.out.println(countZero(in.nextInt()));
        }
    }

    static int countZero(int num) {
        int count = 0;
        while (num > 0) {
            if ((num & 1) == 1) {
                count++;
            }
            num >>= 1;
        }
        return count;
    }
}