1001

仿人的，很奇怪1、2、3一处也不能少，但没找着少了之后结果会不同的测试数据

 

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

public class Main {

	public static void main(String[] args) {
		new Main();
	}

	public Main() {
		Scanner s = new Scanner(System.in);
		while (true) {
			BigDecimal n = s.nextBigDecimal();
			int m = s.nextInt();

			char[] c = n.pow(m).toPlainString().toCharArray();
			int begin = 0;
			int end = c.length - 1;

			while (c[begin] == '0') {//1
				begin++;
			}
			while (c[end] == '0') {//2
				end--;
			}
			if (c[end] == '.') {//3
				end--;
			}
			for (; begin <= end; begin++) {
				System.out.print(c[begin]);
			}
			System.out.println();
		}
	}
}

 http://blog.knowsky.com/197659.htm

 

下面的是我未通过的程序

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

public class Main {

	BigDecimal d = new BigDecimal(10000);

	public static void main(String[] args) {
		new Main();
	}

	public Main() {
		Scanner s = new Scanner(System.in);
		while (s.hasNextFloat()) {
			float n = s.nextFloat();
			int m = s.nextInt();
			System.out.println(exec((int) (n * 10000), m));
		}
		s.close();
	}

	public String exec(int a, int b) {
		String result = new BigDecimal(a).pow(b).divide(d.pow(b)).toPlainString();
		if (result.startsWith("0.")) {
			return result.substring(1);
		}
		return result;
	}
}