java/c#/js超大整数比较思路

由于我的app不再用版本号比较版本,而是用编译时间,因此我就想到了超大整数函数解决这个问题

public class Main {
    public static void main(String[] args) {
        BigInteger num1 = new BigInteger("202302031422");
        BigInteger num2 = new BigInteger("202302031433");

        int result = num1.compareTo(num2);

        if (result < 0) {
            System.out.println(num1 + " 小于 " + num2);
        } else if (result > 0) {
            System.out.println(num1 + " 大于 " + num2);
        } else {
            System.out.println(num1 + " 等于 " + num2);
        }
    }
}

思路2

String num1 = "202302031422";
String num2 = "202302031433";

// 比较长度，长度不同的先返回
int len1 = num1.length();
int len2 = num2.length();
if (len1 < len2) {
    System.out.println(num1 + " 小于 " + num2);
} else if (len1 > len2) {
    System.out.println(num1 + " 大于 " + num2);
} else {
    // 长度相同，逐位比较
    for (int i = 0; i < len1; i++) {
        char c1 = num1.charAt(i);
        char c2 = num2.charAt(i);
        if (c1 < c2) {
            System.out.println(num1 + " 小于 " + num2);
            return;
        } else if (c1 > c2) {
            System.out.println(num1 + " 大于 " + num2);
            return;
        }
    }
    System.out.println(num1 + " 等于 " + num2);
}

js

et num1 = "202302031422";
let num2 = "202302031433";

let result = BigInt(num1) < BigInt(num2) ? num1 + " 小于 " + num2
                : BigInt(num1) > BigInt(num2) ? num1 + " 大于 " + num2 
                : num1 + " 等于 " + num2;

console.log(result);

c#

using System;
using System.Numerics;

class Program
{
    static void Main(string[] args)
    {
        string num1 = "202302031422";
        string num2 = "202302031433";

        BigInteger bigInt1 = BigInteger.Parse(num1);
        BigInteger bigInt2 = BigInteger.Parse(num2);

        int result = bigInt1.CompareTo(bigInt2);

        if (result < 0)
        {
            Console.WriteLine(num1 + " 小于 " + num2);
        }
        else if (result > 0)
        {
            Console.WriteLine(num1 + " 大于 " + num2);
        }
        else
        {
            Console.WriteLine(num1 + " 等于 " + num2);
        }
    }
}