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[.net] Reversing a string

Started by tasen Mar 14, 2007 at 7:01 PM 4 replies 1.5k views

Original Post

Mar 14, 2007 at 7:01 PM

Hi all, I've just spent the last half hour Googling for an answer to this but I can't seem to find one; is there a method for reversing strings in C#? All the sites seem to be rolling their own methods to do it. Am I missing something obvious here or should I just roll my own method as well?

string str = "Hello";

Reverse(string); // i.e. str == "olleH"

Any help is greatly appreciated.

intransigent-seal

Mar 14, 2007 at 7:14 PM

The Array class contains a method for reversal, but to use it you'd have to convert the string to a char array and back, something like:

{    string s = "Hello, world!";    char[] cs = s.ToCharArray();    Array.Reverse(cs);    string reversed = new String(cs);}

Xai

Mar 14, 2007 at 7:28 PM

and the reason people roll there own, is they can do it with 1 less copy than the "built-in" method ... or cause they just never thought of using the array reverse.

tasen

Mar 15, 2007 at 2:14 AM

Quote:
Original post by JohnBSmall
The Array class contains a method for reversal, but to use it you'd have to convert the string to a char array and back, something like:
*** Source Snippet Removed ***

Thanks. That's what I was looking for (and indeed, for the stuff I'm doing a char array is more appropriate anyway).

Also, on an unrelated note, is there a built-in function to output arrays with (i.e. a character array), or must I just loop through the array manually and print each character?

Cheers

benryves

Mar 15, 2007 at 5:29 AM

There is a constructor for string that takes an array of char (as demonstrated in JohnBSmall's post); that is you could do:

char[] SomeCharArray; Console.WriteLine(new string(SomeCharArray));

intransigent-seal

Mar 15, 2007 at 8:19 AM

The output functions (eg, Console.WriteLine) have an overload that takes a char[] array directly, so you don't even have to create the string object.

John B

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