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);
           
    }

}