输入一个int型的正整数，计算出该int型数据在内存中存储时1的个数

通过运算二进制计算有多少个1

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int num = sc.nextInt();
            int count = 0;
            do {
                if (num % 2 == 1) {
                    count++;
                }
            } while ((num /= 2) > 0);
            System.out.println(count);
        }
    }
}