题解 | 求int型正整数在内存中存储时1的个数

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNext()) { 
            int number = in.nextInt();
            String sc = Integer.toBinaryString(number);
            int j = 0;
            for (char i : sc.toCharArray()) {
                if (i == '1')
                    j++;
            }
            System.out.println(j);
        }
    }
}