# (Hdu 2.3.2) Exponentiation (large number: Evaluate the n power of R), hduexponentiation

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(Hdu 2.3.2) Exponentiation (large number: Evaluate the n power of R), hduexponentiation

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Question:

 Exponentiation Time Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission (s): 1938 Accepted Submission (s): 527 Problem DescriptionProblems involving the computation of exact values of very large magnstrap and precision are common. For example, the computation of the national debt is a taxing experience for your 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

Question Analysis:

Simple question. The basic usage of large numbers. Evaluate the n power of R.

The Code is as follows:

`Import java. math. bigDecimal; import java. util. extends; public class Main {public static void main (String [] args) {extends = new loads (System. in); while (partial. hasNext () {BigDecimal r = Hangzhou. nextBigDecimal (); // for this large number question of R ^ n. R should be read in the form of BigDecimal. otherwise, various problems may occur: int n = random. nextInt (); r = r. pow (n);/*** stripTrailingZeros (): Remove invalid 0 * toPlainString (): convert scientific notation to common notation * For example, convert a String 1.238761976E-10 * To 0.0000000001238761976 */String result = r. stripTrailingZeros (). toPlainString (); if (result. startsWith ("0. ") {// used to process 0. XXX case result = result. substring (1);} System. out. println (result );}}}`

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