joj1483 Exponentiation

 1483: Exponentiation

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Result	TIME Limit	MEMORY Limit	Run Times	AC Times	JUDGE
	3s	8192K	365	109	Standard

Problems involving the computation of exact values of very large magnitude and precision are common. For example, the computation of the national debt is a taxing experience for many computer systems.

This problem requires that you write a program to compute the exact value of Rⁿ where R is a real number ( 0.0 < R < 99.999) and n is an integer such that .

Input

The input will consist of a set of pairs of values for  R and  n. The  R value will occupy columns 1 through 6, and the  n value will be in columns 8 and 9.

Output

The output will consist of one line for each line of input giving the exact value of  R ⁿ. Leading zeros and insignificant trailing zeros should be suppressed in the output.

Sample Input

 

95.123 12

0.4321 20

5.1234 15

6.7592  9

98.999 10

1.0100 12

Sample Output

 

548815620517731830194541.899025343415715973535967221869852721

.00000005148554641076956121994511276767154838481760200726351203835429763013462401

43992025569.928573701266488041146654993318703707511666295476720493953024

29448126.764121021618164430206909037173276672

90429072743629540498.107596019456651774561044010001

1.126825030131969720661201

 

 

 

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Java除了慢一点，大数处理上绝对很方便...

不过自己用C写也可以练习一下。

这里就用Java吧...

 1 import java.io.*;

 2 import java.util.*;

 3 import java.math.*;

 4 

 5 public class Main 

 6 {

 7 

 8     public static void main(String args[])

 9     {

10         Scanner cin = new Scanner(new BufferedInputStream(System.in)); 

11     

12         BigDecimal num;

13         int n;

14         String str;

15    

16         while(cin.hasNextBigDecimal())

17         {

18             num = cin.nextBigDecimal();

19             n = cin.nextInt();

20             num = num.pow(n);

21         

22             str = num.stripTrailingZeros().toPlainString();

23     

24             if(str.startsWith("0."))

25             {

26                 str = str.substring(1);

27             }

28     

29             System.out.println(str);

30         }

31     }

32 }