题解 | #求int型正整数在内存中存储时1的个数#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class HJ15_cunchugeshu {
    //求int型正整数在内存中存储时1的个数
    public static void main(String[] args) throws IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        int input = Integer.parseInt(bf.readLine());
        bf.close();
        int num = 0;
        if(input!=0){
            while (input!=1){
                if(input%2==1){
                    num++;
                }
                input=input/2;
            }
            num++;
            System.out.println(num);
        }else {
            System.out.println(0);
        }
    }
}