Exponentiation |
| Time Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) |
| Total Submission(s): 2798 Accepted Submission(s): 761 |
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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. |
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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.
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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.
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Sample Input
95.123 12
0.4321 20
5.1234 15
6.7592 9
98.999 10
1.0100 12
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Sample Output
548815620517731830194541.899025343415715973535967221869852721
.00000005148554641076956121994511276767154838481760200726351203835429763013462401
43992025569.928573701266488041146654993318703707511666295476720493953024
29448126.764121021618164430206909037173276672
90429072743629540498.107596019456651774561044010001
1.126825030131969720661201
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Java高精度类 BigDecimal 的运用；
public class Main {
public static void main(String[] args) {
Scanner sin=new Scanner(System.in);
while(sin.hasNext()){
BigDecimal r=sin.nextBigDecimal();
int n=sin.nextInt();
BigDecimal ans=r.pow(n).stripTrailingZeros();//stripTrailingZeros去除后面的0
String str=ans.toPlainString();//避免科学记数法
if(str.charAt(0)=='0')
str=str.substring(1);
System.out.println(str);
}
}
}