poj1001大数乘方java

最新推荐文章于 2020-09-26 14:27:01 发布

原创最新推荐文章于 2020-09-26 14:27:01 发布 · 725 阅读

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本文探讨了如何高效地计算具有极高精度的实数幂次，通过实例展示了从输入实数和整数指数到精确输出计算结果的完整流程，特别关注于避免传统方法中常见的精度损失问题。

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Problem Description

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 0 < n <= 25.

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 should be suppressed in the output. Insignificant trailing zeros must not be printed. Don't print the decimal point if the result is an integer.

Sample Input

Sample Output

548815620517731830194541.899025343415715973535967221869852721
.00000005148554641076956121994511276767154838481760200726351203835429763013462401
43992025569.928573701266488041146654993318703707511666295476720493953024
29448126.764121021618164430206909037173276672
90429072743629540498.107596019456651774561044010001
1.126825030131969720661201

import java.math.*;
import java.util.*;
class  n{
    public static void main(String[] args){
        Scanner in=new Scanner(System.in);
        while(in.hasNext()){
            BigDecimal val=in.nextBigDecimal();
            int n=in.nextInt();
            BigDecimal ret=val.pow(n).stripTrailingZeros();
            System.out.println( ret.toPlainString().replaceAll("^0", "") );
        }
    }


}

//pow(); 乘方

//stripTrailingZeros 末尾除零

//toPlainString 防止高精度数使用科学计数法

//replaceAll("^0", "") 去掉前导零