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

Source: Internet
Author: User

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

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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 <R <99.999) and n is an integer such that 0 <n <= 25.
InputThe 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.
OutputThe output will consist of one line for each line of input giving the exact value of R ^ n. leading zeros shocould 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
95.123 120.4321 205.1234 156.7592  998.999 101.0100 12
Sample Output
SourceEast Central North America 1988

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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