题解 | #查找输入整数二进制中1的个数#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String len = "";
        while((len=br.readLine())!=null){
            int i = Integer.parseInt(len);
            int count = 0;
            while(i!=0){
                if((i&1)==1){
                    count++;
                }
                i=i>>1;
            }
            System.out.println(count);
        }
    }
}