poj 1131java大数类

import java.math.*;
import java.util.Scanner;

public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner input = new Scanner(System.in);
		BigDecimal one = new BigDecimal(1), eight = new BigDecimal(8);
		String str;
		while (input.hasNext()) {
			BigDecimal ans = new BigDecimal(0);
			BigDecimal a = one.divide(eight);
			str = input.next();
			for (int i = 2; i < str.length(); i++) {
				ans = ans.add(a.multiply(new BigDecimal(str.charAt(i) - 48)));
				a = a.divide(eight);
			}
			System.out.println(str + " [8]" + " = " + ans.toString() + " [10]");
		}
	}

}