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);
        int num;
        while(sc.hasNext()){
            num = sc.nextInt();
            int count=0;
            while(num >0){
                if((num&1) ==1)count++;
                num = num>>1;
            }
            System.out.println(count);
            
        }
    }
}