Exponentiation --Java

http://acm.hdu.edu.cn/game/entry/problem/show.php?chapterid=2§ionid=3&problemid=2

import java.math.*;
import java.util.Scanner;
public class Main
{
public static void main(String[] args)
{
Scanner cin=new Scanner (System.in);
BigDecimal[] f=new BigDecimal[20];
int n;
while(cin.hasNext())
{
BigDecimal a;
int b;
a=cin.nextBigDecimal();
b=cin.nextInt();
String c=a.pow(b).stripTrailingZeros().toPlainString();
if(c.startsWith("0")) c=c.substring(1);
System.out.println(c);
}
}
}