题解 | #求int型正整数在内存中存储时1的个数#

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();
        String s = Integer.toBinaryString(num) + "";
        int count = 0;
        for(int i = 0;i < s.length();i++){
            if(s.charAt(i) == '1'){
                count++;
            }
        }
        System.out.println(count);
    }
}