Exponentiation java大数

 1 import java.util.*;
 2 import java.math.*;
 3 import java.text.*;
 4 public class Main
 5 {
 6     public static void main(String[] args)
 7     {    
 8         Scanner cin=new Scanner(System.in);
 9         BigDecimal a;
10         int n;
11         String s;
12         while(cin.hasNext())
13         {
14             a=cin.nextBigDecimal();
15             n=cin.nextInt();
16             a=a.pow(n).stripTrailingZeros();
17             s=a.toPlainString();
18             if(s.charAt(0)==‘0‘)
19                 s=s.substring(1);
20             System.out.println(s);
21         }
22     }
23 }