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 n = scanner.nextInt();
      int res = 0;
      while(n != 0){
          res += n & 1;
          n = n >>> 1;
      }
      System.out.println(res);
   }
}