Randomise character positions in string

[Mike P]

Does anybody have a simple method for randomising the character
positions in a string?

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[Roger Frost]

Like a scramble method where "Hello, World!" becomes something like
"leol,H!o rlWd" ?

--
Roger Frost
"Logic Is Syntax Independent"

"Mike P" <mi*******@gmail.comwrote in message
news:eH**************@TK2MSFTNGP05.phx.gbl...

Does anybody have a simple method for randomising the character
positions in a string?

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[Marc Gravell]

How about (off the top of my head):

public static string Scramble(string input) {
if(string.IsNullOrEmpty(input)) return input; // GIGO

List<charinputChars = new List<char>(input);
char[] outputChars = new char[inputChars.Count];
Random rand = new Random();
// fill backwards to simplify Rand.Next() logic
for (int i = inputChars.Count - 1; i >= 0; i--)
{
int index = rand.Next(i);
outputChars[i] = inputChars[index];
inputChars.RemoveAt(index);
}
return new string(outputChars);
}

public static void Main()
{
string foo = "The quick brown fox jumps over the lazy
dog";
string bar = Scramble(foo);
}

[Roger Frost]

Oh, and at some point will you need to restore the string to it's original
state?

--
Roger Frost
"Logic Is Syntax Independent"

Like a scramble method where "Hello, World!" becomes something like
"leol,H!o rlWd" ?

[Mike P]

Roger,

Yes, exactly like that, but I won't need to restore the string to its
original state.
Thanks,

Mike

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