JAVA hdu 1063 Exponentiation（高精度）

import java.util.Scanner;
import java.math.BigDecimal;
import java.math.BigInteger;

class Main {
public static void main(String[] args) {
Scanner inScanner = new Scanner(System.in);
while (inScanner.hasNext()) {
BigDecimal a = inScanner.nextBigDecimal();
int n = inScanner.nextInt();
BigDecimal ans = a.pow(n);
String s = ans.stripTrailingZeros().toPlainString();
int temp = 0;
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) != '0') {
temp = i;
break;
}
if (s.charAt(i) == '.') {
temp = i;
break;
}
}
String ansString = s.substring(temp);
System.out.println(ansString);
}
}
}