nyoj-155-求高精度幂(java大数)

 1 import java.util.*;
 2 import java.math.*;
 3 public class Main{
 4 
 5     public static void main(String[] args) {
 6         Scanner cin = new Scanner(System.in);
 7         while (cin.hasNext()) {
 8             BigDecimal numa = cin.nextBigDecimal();
 9             int numb = cin.nextInt();
10             String str = numa.pow(numb).stripTrailingZeros().toPlainString();
11             if (str.startsWith("0.")) {//如果开头是0.那么从小数点开始输出
12                 System.out.println(str.substring(1));
13             } else {
14                 System.out.println(str);
15             }
16         }
17     }
18 }