大数基本运算

import java.io.*;  
import java.util.*;  
import java.text.*;  
import java.math.*;  
public class Main  
{  
    public static void main(String []args)  
    {  
        Scanner cin = new Scanner(new BufferedInputStream(System.in));  
        while(cin.hasNext())  
        {  
           BigInteger a=cin.nextBigInteger();  
           BigInteger b=cin.nextBigInteger();  
           BigInteger c1=a.add(b);   //大数加法  
               System.out.println("加的结果为 "+c1);  
           BigInteger c2=a.subtract(b); //大数减法  
               System.out.println("减的结果为 "+c2);  
           BigInteger c3=a.multiply(b); //大数乘法  
               System.out.println("乘的结果为 "+c3);  
           BigInteger c4=a.divide(b); //大数除法  
               System.out.println("除的结果为 "+c4);  
           //BigInteger c5=a.mod(b); //大数模  
                BigInteger c5=a.remainder(b);  
                System.out.println("模的结果为 "+c5);  
           BigInteger c6=a.max(b);//取最大  
                System.out.println("最大为 "+c6);  
           BigInteger c7=a.min(b); //取最小  
                System.out.println("最小为 "+c7);  
           if(a.equals(b)) //判断是否相等  
                System.out.println("相等");  
           else System.out.println("不相等");  
           BigInteger c8=a.gcd(b); //求最大公约数  
                System.out.println("最大公约数为 "+c8);  
       }  
    }  
}