京东拍拍网 笔试 搞java的去考C++ 苦逼

package 京东;

public class Main {
private static  int a=0;
public static void fun(int m)
{
if(m!=0)
{

a=10*a+m%10;
fun(m/10);
}

}

public static void main(String[] args) {
// TODO Auto-generated method stub
fun(-7);
System.out.println(a);

}

}