C# 0 The Complete Reference

Reversing an Array

Sometimes it is useful to reverse the contents of an array. For example, you might want to 

change an array that has been sorted in ascending order into one sorted in descending 

order. Reversing an array is easy: Simply call 

Reverse( )

. Using 

Reverse( )

, you can reverse 

all or part of an array. The following program demonstrates the process:

// Reverse an array.

using System;

class ReverseDemo {

  static void Main() {

    int[] nums = { 1, 2, 3, 4, 5 };

    // Display original order.

    Console.Write("Original order: ");

    foreach(int i in nums)

      Console.Write(i + " ");

    Console.WriteLine();

    // Reverse the entire array.

    Array.Reverse(nums);

    // Display reversed order.

    Console.Write("Reversed order: ");

    foreach(int i in nums)

      Console.Write(i + " ");

    Console.WriteLine();

    // Reverse a range.

    Array.Reverse(nums, 1, 3);

    // Display reversed order.

    Console.Write("Range reversed: ");

    foreach(int i in nums)

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