java大数加法

package hello;

import java.util.Scanner;
import java.math.BigInteger;

public class hello {
    
    
	/********* Begin *********/
	public static void main(String[] args)
	 {
    
    
		Scanner sc = new Scanner(System.in);
		 BigInteger num=sc.nextBigInteger();
		 BigInteger num2=sc.nextBigInteger();
		System.out.println(num.multiply(num2));
		 System.out.println(num.divide(num2));
		 System.out.println(num.subtract(num2));
		//判断用户名
		
		
	}
}