大数

1、java:

import java.util.*;
import java.math.*;
public class Main {
    public static void main(String args[]){
        Scanner cin = new Scanner(System.in);
        BigInteger a,b;
        
        while(cin.hasNext()){
            a=cin.nextBigInteger();
            b=cin.nextBigInteger();
            //四则运算
            System.out.println(a.add(b));//加
            System.out.println(a.subtract(b));//减
            System.out.println(a.multiply(b));//乘
            System.out.println(a.divide(b));//除
            System.out.println(a.remainder(b));//取模
            //比较
            if(a.compareTo(b)==0) System.out.println("a==b");
            else if(a.compareTo(b)>0) System.out.println("a>b");
            else if(a.compareTo(b)<0) System.out.println("a<b");
            //十进制表示
            System.out.println(a.toString());
            //返回大整数p进制的制服表示
            int p=8;
            System.out.println(a.toString(p));
        }
    }
}