java大数轻松过

 import java.util.Scanner;
 import java.math.BigInteger;
 public class Main {
     public static void main(String[] args) {
         Scanner scan = new Scanner(System.in);
         BigInteger a = scan.nextBigInteger();
         BigInteger b = scan.nextBigInteger();
         System.out.println(a+" + "+b+" = "+a.add(b));
         System.out.println(a+" - "+b+" = "+a.subtract(b));
         System.out.println(a+" * "+b+" = "+a.multiply(b));
         System.out.println(a+" / "+b+" = "+a.divide(b));
     }
 }