题解 | #句子逆序#

十进制转换二级制用除余法,不断地除2取余数判断如果是1计数器自增!

public class demo {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();//获取十进制数
        int count = 0;/计数器
        //循环取余数做判断
        while (num != 0) {
            if (num % 2 == 1) {
                count++;
            }
            num /= 2;
        }
        System.out.println(count);
    }
}