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copied!<p>EDIT: <strong>This code was written a long time before the question edit which fleshed out the requirements.</strong></p> <p>Given that a single line of C can contain a huge number of statements, it's almost certainly true without being useful.</p> <p>In C# I'd almost certainly write it in more than 10 lines, even though it would be <em>feasible</em> in 10. I'd separate out the "parse nybble" part from the "convert a string to a byte array" part.</p> <p>Of course, if you don't care about spotting incorrect lengths etc, it becomes a bit easier. Your original text also contained spaces - should those be skipped, validated, etc? Are they part of the <em>required</em> input format?</p> <p>I rather suspect that the comment was made without consideration as to what a pleasant, readable solution would look like.</p> <p>Having said that, here's a hideous version in C#. For bonus points, it uses LINQ completely inappropriately in an effort to save a line or two of code. The lines could be longer, of course...</p> <pre><code>using System; using System.Linq; public class Test { static void Main(string[] args) { byte[] data = ParseHex(args[0]); Console.WriteLine(BitConverter.ToString(data)); } static byte[] ParseHex(string text) { Func<char, int> parseNybble = c => (c >= '0' && c <= '9') ? c-'0' : char.ToLower(c)-'a'+10; return Enumerable.Range(0, text.Length/2) .Select(x => (byte) ((parseNybble(text[x*2]) << 4) | parseNybble(text[x*2+1]))) .ToArray(); } } </code></pre> <p>(This is avoiding "cheating" by using any built-in hex parsing code, such as <code>Convert.ToByte(string, 16)</code>. Aside from anything else, that would mean losing the use of the word nybble, which is always a bonus.)</p>

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