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 sc = new Scanner(System.in);
        int num = sc.nextInt();
        while(num > 1) {
            if(num%2 == 1) finalNum++;
            num /= 2;
        }
        if(num == 1) finalNum++;
        System.out.println(finalNum);
        
        sc.close();
    }
}