Example of reversing a char array

reverse.cs

using System;

namespace ScratchPad
{
	class Program
	{
		public static void Main()
		{
			// A char array that will be reversed
			// You will also notice that it showcases how to store more than one variable in the loop that is local to the scope
			char[] reverse = { 'R', 'e', 'v', 'e', 'r', 's', 'e', 'd' };

			/* How it works:
			 * R is swapped with d
			 * e is swapped with e
			 * v is swapped with s
			 * e is swapped with r
			 */

			// i, j and length are local to the for loop and are initilised only once, as show when debugging.
			// length is divided by 2 as stated above in the how it works section.
			// The reason for not having reverse.Length / 2 in the condition part, is math expressions are expensive in loops and should be avoided
			for (int i = 0, j = reverse.Length - 1, length = reverse.Length / 2; i < length; i++, j--)
			{
				// The char needs to be stored as we loose it in the swapping
				char temp = reverse[i];
				// Swap
				reverse[i] = reverse[j];
				// Now re-add the temp char
				reverse[j] = temp;
			}

			// A way to create a new string from a char array
			// Notice how it is reversed
			Console.WriteLine(new string(reverse));

			Console.Write("Press any key to continue . . .");
			Console.ReadKey(true);
		}
	}
}