Java学习（三）（大整数BigInteger）

版权声明： https://blog.csdn.net/moon_sky1999/article/details/84941206

import java.io.*;
import java.util.*;
import java.math.*;

public class Main {
    public static void main(String args[]) {
        Scanner cin = new Scanner(System.in);
        BigInteger a, b;
        //以文件EOF结束
        while (cin.hasNext()) {
            a = cin.nextBigInteger();
            b = cin.nextBigInteger();

            System.out.println(a.add(b)); //大整数加法
            System.out.println(a.subtract(b)); //大整数减法
            System.out.println(a.multiply(b)); //大整数乘法
            System.out.println(a.divide(b)); //大整数除法(取整)
            System.out.println(a.remainder(b)); //大整数取模

            //大整数的比较
            if (a.compareTo(b) == 0) System.out.println("a == b"); //大整数a==b
            else if (a.compareTo(b) > 0) System.out.println("a > b"); //大整数a>b
            else if (a.compareTo(b) < 0) System.out.println("a < b"); //大整数a<b

            //大整数绝对值
            System.out.println(a.abs()); //大整数a的绝对值

            //大整数的幂
            int exponent = 10;
            System.out.println(a.pow(exponent)); //大整数a的exponent次幂

            //返回大整数十进制的字符串表示
            System.out.println(a.toString());

            //返回大整数p进制的字符串表示
            int p = 8;
            System.out.println(a.toString(p));
        }
    }
}