HDOJ 1063 Exponentiation

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JAVA大數....

xx.stripTrailingZeros().toPlainString() 去末尾的0並不用科學計數法顯示

Exponentiation Time Limit: 1000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 6740    Accepted Submission(s): 1882


Problem DescriptionProblems 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. 
 
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 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

95.123 120.4321 205.1234 156.7592  998.999 101.0100 12

 
Sample Output

548815620517731830194541.899025343415715973535967221869852721.0000000514855464107695612199451127676715483848176020072635120383542976301346240143992025569.92857370126648804114665499331870370751166629547672049395302429448126.76412102161816443020690903717327667290429072743629540498.1075960194566517745610440100011.126825030131969720661201

 
SourceEast Central North America 1988 

import java.util.*;import java.math.*;public class Main{public static void main(String[] args){Scanner cin=new Scanner(System.in);while(cin.hasNextBigDecimal()){BigDecimal ans=cin.nextBigDecimal();int n=cin.nextInt();ans=ans.pow(n);StringBuilder s=new StringBuilder(ans.stripTrailingZeros().toPlainString());if(s.charAt(0)=='0')System.out.println(s.substring(1));elseSystem.out.println(s);}}}