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 scanner = new Scanner(System.in);
        int num = scanner.nextInt();

        String binary = "";

        while (num>0) {
            int remainder = num % 2;
            
            if (remainder==1){
                binary += remainder;
            }

            num = num/2;
        }

        System.out.println(binary.length());
        
    }
}