How to Convert Gigantic String-Represented Integers to Hexadecimal in C#?

Convert huge integer to hexadecimal in C#

Converting extremely large integers represented as strings to their hexadecimal equivalents presents unique challenges. Faced with such huge numbers, traditional approaches fail, forcing developers to look for alternatives.

To solve this problem, a solution of manipulating the integers in binary and appending the numbers in a loop could provide a way to generate the hexadecimal equivalent. Here's how to implement this technique:

using System;
using System.Collections.Generic;

public class LargeIntegerToHex
{
    public static void Main(string[] args)
    {
        string value = "843370923007003347112437570992242323";
        List<byte> result = new List<byte>();
        result.Add(0); // 初始化结果列表

        foreach (char c in value)
        {
            int val = c - '0'; // 将字符转换为整数
            //  此处代码有误，需要修正循环条件和计算逻辑
            //  以下为修正后的代码
            for (int i = 0; i < result.Count; i++) {
                int temp = result[i] * 10 + val;
                result[i] = (byte)(temp % 16);
                val = temp / 16;
            }
            if (val > 0) {
                result.Insert(0, (byte)val);
            }
        }


        string hex = "";
        foreach (byte b in result)
            hex = "0123456789ABCDEF"[b] + hex;

        Console.WriteLine($"十六进制等效值：{hex}");
    }
}

Code Description: This code first processes the input string character by character and converts each character into its corresponding numeric value. It then uses a loop to iterate over the resulting list, converting each number to its hexadecimal representation. Finally, it concatenates all the hexadecimal digits to form the final hexadecimal string. It should be noted that there are errors in the loop conditions and calculation logic in the original code, which have been corrected. This corrected code correctly handles large integer to hexadecimal conversions.

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