POJ 1001: Exponentiation
阿新 • • 發佈:2018-07-19
rgs scanner set ati close system one strip new
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.
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.
題目描述
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.
輸入
輸出
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.樣例輸入
樣例輸出
import java.math.*; import java.util.*; class Main { public static void main(String[] args) { Scanner cin=new Scanner(System.in); while(cin.hasNext()){ BigDecimal r=cin.nextBigDecimal(); int n=cin.nextInt(); BigDecimal ans= r.pow(n); ans=ans.stripTrailingZeros(); String astring=ans.toPlainString(); if(astring.startsWith("0."))astring=astring.substring(1); System.out.println(astring); } } }View Code
POJ 1001: Exponentiation