计算大实数R^n的值。
import java.io.*; import java.math.*; import java.util.*; import java.text.*; public class Main { public static void main(String[] args) { Scanner cin = new Scanner(System.in); BigDecimal num;//定义一个大实数 int ep,sta, end, i; String st; while(cin.hasNext()/*相当于C++的!=EOF*/) { num = cin.nextBigDecimal(); //底数 ep = cin.nextInt(); //指数 num = num.pow(ep); //计算num^ep st = new String(num.toPlainString()); //转为字符串 sta = 0; while(st.charAt(sta) == '0') sta++; //去掉前缀的0 end = st.length() -1; while(st.charAt(end)=='0') end--; //去掉后缀的0 if(st.charAt(end)=='.') end--; //若小数点后没0,去掉 for(i=sta; i<=end; i++) System.out.print(st.charAt(i)); System.out.println(); } System.exit(0); } }