JAVA 最基本功能

import java.util.*;
import java.math.*;
import java.io.*;
public class mb
{
    public static void main(String args[]) throws Exception
    {
        //输入输出
        /*
        Scanner cin=new Scanner(new BufferedInputStream(System.in));
        // PrintWriter cout = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
        PrintWriter cout = new PrintWriter(new BufferedOutputStream(System.out));
        int a, b;
        while(cin.hasNext())
        {
            a = cin.nextInt();
            b = cin.nextInt();
            cout.println(a +  b);
        }
        cout.flush();//必须加
        //或者下面这种也行
        Scanner cin=new Scanner(System.in);
        while(cin.hasNext())
        {
            System.out.println(cin.nextInt()+cin.nextInt());
        }
        */

        Scanner cin=new Scanner(System.in);
        //输入整数
       /* int n;
        n=cin.nextInt();
        System.out.println(n);*/
        //输入浮点型
        /*double n;
        n=cin.nextDouble();
        System.out.println("n="+n);*/
        //输入整形数组
        /*int n=4;
        int num[]=new int[n];
        for(int i=0;i<n;i++)
        {
            num[i]=cin.nextInt();
        }
        for(int i=0;i<n;i++) System.out.print(num[i]+"   ");System.out.println();*/
        //输入浮点型数组
        /*int n=4;
        double []num=new double[n];
        for(int i=0;i<n;i++) num[i]=cin.nextDouble();
        for(int i=0;i<n;i++) System.out.printf("%.2f  ",num[i]);System.out.println();*/

        //高精度
       /* BigInteger a,b;
        a=cin.nextBigInteger();
        b=cin.nextBigInteger();
        System.out.println("a+b="+a.add(b));//a+b
        System.out.println("a-b="+a.subtract(b));//a-b
        System.out.println("a*b="+a.multiply(b));//a*b
        System.out.println("a/b="+a.divide(b));//a/b
        */

        //a^b   b只能是int 型
        /*BigInteger a=cin.nextBigInteger();
        int b=cin.nextInt();
        System.out.println("a^b="+a.pow(b));//a^b*/

        //int型转换成BigInteger型
        /*int b=cin.nextInt();
        BigInteger a=BigInteger.valueOf(b);
        System.out.println("b->a="+a);
        */

        //高精度数组
        /*int n=4;
        BigInteger []num= new BigInteger[n];
        for(int i=0;i<n;i++) num[i]=cin.nextBigInteger();
        for(int i=0;i<n;i++) System.out.print(num[i]+"   ");System.out.println();
        */
        //高精度比较
       /* BigInteger a,b;
        a=cin.nextBigInteger();
        b=cin.nextBigInteger();
        if(a.compareTo(b)>0) System.out.println("a>b");
        else if(a.compareTo(b)==0) System.out.println("a=b");
        else System.out.println("a<b");*/

        //高精度的gcd  lcm
        /*BigInteger a,b;
        a=cin.nextBigInteger();
        b=cin.nextBigInteger();
        System.out.println("gcd(a,b)="+a.gcd(b));
        System.out.println("lcm(a,b)="+lcm(a,b));
        */

        //gcd
        /*
        int a,b;
        a=cin.nextInt();
        b=cin.nextInt();
        System.out.println("gcd(a,b)="+gcd(a,b));
        */

        //字符串
       // String a,b;
       // a=cin.next();//以空格隔开
       // System.out.println(a);
       // a=cin.nextLine();//读入整行
      //  b=cin.nextLine();//读入整行
       // System.out.println(a);
      //  for(int i=0;i<a.length();i++) System.out.print(a.charAt(i)); System.out.println();

       // a.replace('b','q');//?????

        //字符串比较
       /* if(a.equals(b)) System.out.println("a=b");
        else System.out.println("a!=b");
        */
        //字符串连接
        /*String c=a.concat(b);
        System.out.println(c);*/
        //字符串赋值
        /*a=b;
        System.out.println(a);
        */

        //高精度浮点型
        /*
        BigDecimal a;
        a=cin.nextBigDecimal();
        System.out.println(a);
        */
 BigDecimal a;
        int b;
        while(cin.hasNext())
        {
            a=cin.nextBigDecimal();
            b=cin.nextInt();
            a=a.pow(b);
            String str=a.stripTrailingZeros().toPlainString();//去除后面的0
            if( str.startsWith("0."))
            {
                str = str.substring(1);
            }
            System.out.println( str );

        }
    }
    //调用函数
    //gcd
    static int gcd(int a,int b)
    {
        return b==0?a:gcd(b,a%b);
    }
    //高精度LCM
    static BigInteger lcm(BigInteger a,BigInteger b)
    {
        BigInteger g=a.gcd(b);
        return a.divide(g).multiply(b);
    }
}