题解 | #查找输入整数二进制中1的个数#

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in); 
        while (in.hasNextInt()) { 
            int cnt = 0;
            int a = in.nextInt();
            while(a>0){
                if((a & 1) == 1){
                    cnt++;
                }
                a >>>= 1;
            }
            System.out.println(cnt);
        }
    }
}