题解 | #查找输入整数二进制中1的个数#

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            int n = sc.nextInt();
            String string = Integer.toBinaryString(n);
            int count = 0;
            for (int i = 0; i < string.length(); i++) {
                if(string.charAt(i) == '1'){
                    count++;
                }
            }
            System.out.println(count);
        }
    }
}