nyoj-155-求高精度幂(java大数)

题目链接

 import java.util.*;
 import java.math.*;
 public class Main{

     public static void main(String[] args) {
         Scanner cin = new Scanner(System.in);
         while (cin.hasNext()) {
             BigDecimal numa = cin.nextBigDecimal();
             int numb = cin.nextInt();
             String str = numa.pow(numb).stripTrailingZeros().toPlainString();
             if (str.startsWith("0.")) {//如果开头是0.那么从小数点开始输出
                 System.out.println(str.substring(1));
             } else {
                 System.out.println(str);
             }
         }
     }
 }