题解 | #求int型正整数在内存中存储时1的个数#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b=0,c;
        while(a>1){
            c = a/2;
            //int c = a%2;
            if(a%2==1){
                b +=1;
            }
           
            a =c;
        }
        System.out.print(b+1);
    }
}