UVA 748 Exponentiation

java解决大数幂。输入r和n，输出r的n次方，除去前后无用的0.

import java.util.*;import java.math.*;public class Main {public static void main(String[] args){Scanner cin = new Scanner(System.in);BigDecimal r, ans;String s;int n, l, i;while(cin.hasNext()){r = cin.nextBigDecimal();n = cin.nextInt();ans = r.pow(n);s = ans.toPlainString();if(!s.contains("."))System.out.println(s);else{l = s.length();while(s.charAt(l - 1) == '0')l--;for(i = 0; i < l; i++)if(s.charAt(i) != '0')break;for(; i < l; i++)System.out.print(s.charAt(i));System.out.println();}}}}