java 大数的比较

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import java.math.*;import java.util.*;public class Main {    public static void main(String []args){        Scanner cin = new Scanner (System.in);        BigInteger a,b,c,d;        a=cin.nextBigInteger();        b=cin.nextBigInteger();        c=cin.nextBigInteger();        d=cin.nextBigInteger();        if(a.compareTo(b)<0)//此时由于a<b，则返回值小于0；        {            System.out.println("a<b");        }        if(b.equals(c))//此时由于b==c,则返回值等于0；        {            System.out.println("b==c");        }        if(d.compareTo(c)>0)//此时由于d>c，则返回值大于0；          {            System.out.println("d>c");        }    }}

import java.util.Scanner;import java.math.*;public class Main{    public static void main(String[] args){        Scanner cin = new Scanner(System.in);        BigInteger a, b;        BigInteger t = BigInteger.valueOf(0);        a = cin.nextBigInteger();        b = cin.nextBigInteger();        while(!(a.equals(t)&&b.equals(t))){            if(a.equals(b)){                System.out.println("a==b");            }            else if(a.compareTo(b)>0){                System.out.println("a>b");            }            else System.out.println("a<b");            a = cin.nextBigInteger();            b = cin.nextBigInteger();        }    }}

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