题解 | #求int型正整数在内存中存储时1的个数#

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

/**
 * @author eagle2020
 * @date 2021/9/29
 */
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        String s1 = bufferedReader.readLine();
        System.out.println(Integer.bitCount(Integer.parseInt(s1)));
    }
}