题解 | #求int型正整数在内存中存储时1的个数#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextInt()) {
            int digit = in.nextInt();
            String replaceStr = Integer.toBinaryString(digit).replaceAll("0", "");
            System.out.println(replaceStr.length());
        }
        in.close();
    }
}