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 scan = new Scanner(System.in);
        int number = Integer.valueOf(scan.nextLine().trim());
        int ans = 0;
        while (0 != number) {
            ans += number % 2;
            number /= 2;
        }
        System.out.println(ans);
    }
}