题解 | #求int型正整数在内存中存储时1的个数#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int num = in.nextInt();    //读取数字
        int n = 0;    //计数变量
        for (int i = 0; i < 32; i++) {
            if ((num & 1) == 1) //如果末位为1则计数
                n++;
            num = num >>> 1;    //无符号右移
        }
        System.out.println(n);
    }
}