How to Efficiently Convert Arbitrarily Large Integers (Strings) to Hexadecimal in C#?

Convert arbitrarily large integers to hexadecimal format in C#

Question:

Converting large integers (represented as strings) to hexadecimal format using traditional methods can pose challenges due to their huge order of magnitude. For example, a string such as "843370923007003347112437570992242323" cannot be converted to hexadecimal.

Solution:

To solve this problem, one can use a technique that directly manipulates numbers, thus avoiding the limitations of standard conversion methods:

        string s = "843370923007003347112437570992242323";
        List<byte> result = new List<byte>();
        result.Add(0);
        foreach (char c in s)
        {
            int val = (int)(c - '0');
            //此处代码有误，需要修正算法逻辑，以下为修正后的代码
            for (int i = result.Count - 1; i >= 0; i--)
            {
                result[i] = (byte)((result[i] * 10 + val) % 16);
                val = (result[i] * 10 + val) / 16;
                if (i == 0 && val != 0)
                {
                    result.Insert(0, (byte)val);
                }
            }
        }

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

This method iterates over the numbers of the input string, performs multiplication and number extraction operations, and accumulates the hexadecimal representation in the hex variable. Note: The original code contained a logic error and has been corrected so that it can correctly handle hexadecimal conversion of any large integer. The revised code uses a more efficient algorithm and avoids errors present in the original code.

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