华为机试---求int型数据在内存中存储时1的个数

题目描述

5

2

import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        while(scan.hasNext()){
            int n = scan.nextInt();
            char[] binCh = Integer.toBinaryString(n).toCharArray();
            int length = binCh.length;
            int count = 0;
            for(int i = 0 ; i < length ; i++){
                if(binCh[i] == '1') count++;
            }
            System.out.println(count);
        }
        scan.close();
    }
}