题解 | #查找输入整数二进制中1的个数#

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        while (scan.hasNext()) {
            int num = Integer.valueOf(scan.nextLine().trim());
            System.out.println(process(num));
        }
    }
    public static int process(int num) {
        int ans = 0;
        while (num != 0) {
            if (num % 2 != 0) {
                ans++;
            }
            num /= 2;
        }
        return ans;
    }
}