java大数

import java.util.*;
import java.math.*;
public class Main
{
    public static void main(String args[])
    {
        Scanner cin = new Scanner(System.in);
        BigInteger a, b;
        //以文件EOF结束
        while (cin.hasNext())
        {
            a = cin.nextBigInteger();
            b = cin.nextBigInteger();
            System.out.println(a.add(b)); //大整数加法
            System.out.println(a.subtract(b)); //大整数减法
            System.out.println(a.multiply(b)); //大整数乘法
            System.out.println(a.divide(b)); //大整数除法(取整)
            System.out.println(a.remainder(b)); //大整数取模
            //大整数的比较
            if( a.compareTo(b) == 0 ) System.out.println("a == b"); //大整数a==b
            else if( a.compareTo(b) > 0 ) System.out.println("a > b"); //大整数a>b
            else if( a.compareTo(b) < 0 ) System.out.println("a < b"); //大整数a<b
            //大整数绝对值
            System.out.println(a.abs()); //大整数a的绝对值
            //大整数的幂
            int exponent=10;
            System.out.println(a.pow(exponent)); //大整数a的exponent次幂
            //返回大整数十进制的字符串表示
            System.out.println(a.toString());
            //返回大整数p进制的字符串表示
            int p=8;
            System.out.println(a.toString(p));
        }
    }
}