题解 | #查找输入整数二进制中1的个数#

import java.util.*;

public class Main {

public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    while(sc.hasNext()){
        String str=Integer.toBinaryString(sc.nextInt());
        System.out.println(str.length()-str.replaceAll("1","").length());
    }
}

}