hdu 1063 Exponentiation

 1 import java.math.BigDecimal;
 2 import java.util.*;
 3 public class Main {
 4     public static void main(String []args)
 5     {
 6         Scanner cin=new Scanner(System.in);
 7         BigDecimal r,mutil;    
 8         String ans;
 9         int n;
10         while(cin.hasNextBigDecimal())
11         {
12             r=cin.nextBigDecimal();
13             n=cin.nextInt();
14             mutil=r.pow(n);//乘方
15             mutil=mutil.stripTrailingZeros();//去掉后导零
16             ans=mutil.toPlainString();
17             if(ans.indexOf(‘0‘)==0)
18             {
19                 ans=ans.substring(1);//小于零去掉零
20             }
21             System.out.println(ans);
22         }
23     }
24 
25 }