题解 | #查找输入整数二进制中1的个数#

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 sc = new Scanner(System.in);
        while (sc.hasNext()){
            int in = sc.nextInt();
            String s = Integer.toBinaryString(in);
            System.out.println(s.replace("0","").length());
        }
    }
}