hdu 1063(求a的n次幂——大数运算)

题目大意：输入R和n，输出R的n次幂

解题思路：看题就做就行了

代码如下：

package com.njupt.bigInteger;

import java.math.BigDecimal;
import java.util.Scanner;


public class HDU_1063_2 {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n ;
		while(scanner.hasNextBigDecimal()){
			BigDecimal r = new BigDecimal("1");
			BigDecimal a;
			a = scanner.nextBigDecimal();
			n = scanner.nextInt();
			
			for(int i = 1 ; i <= n ; ++i){
				r = r.multiply(a);
			}
			
			r = r.stripTrailingZeros();
			String str = r.toPlainString();
			if(str.startsWith("0.")){
				str = str.substring(1);
			}
			 
			System.out.println(str);
		}
		
	}
	
}