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));                
    }
}