Array.Reverse

Learn to reverse an array with Array.Reverse.

Array.Reverse

Array.Reverse reverses the order of elements in an array. The first element moves to the end, the last to the front. Like Array.Sort, this is done in place; it changes the array itself.

After int[] nums = { 1, 2, 3 }; Array.Reverse(nums);, the nums array becomes { 3, 2, 1 }. Reverse does not sort by itself; it only flips the existing order.

Descending sort

Array.Sort only sorts ascending. For a descending sort you need two steps: first sort ascending with Array.Sort, then reverse with Array.Reverse.

For example, on the array { 78, 92, 65 }, applying Sort first gives { 65, 78, 92 }; applying Reverse afterwards leaves { 92, 78, 65 }. The array is now sorted descending.

Exercise Sort, reverse and print the first element

On the given int[] scores = { 78, 92, 65, 88 }; array, first sort ascending with Array.Sort(scores), then reverse with Array.Reverse(scores). Then print the first element with Console.WriteLine.

Show example solution

First sort with Array.Sort(scores);, then reverse with Array.Reverse(scores);, finally print with Console.WriteLine(scores[0]);.
Example solution:
using System;

class Program
{
    static void Main()
    {
        int[] scores = { 78, 92, 65, 88 };
        // Sort, reverse and print the first element
        Array.Sort(scores);
        Array.Reverse(scores);
        Console.WriteLine(scores[0]);
    }
}

Test yourself

Array.Reverse call

int[] nums = { 1, 2, 3 };
____
Console.WriteLine(nums[0]);

Show answer

int[] nums = { 1, 2, 3 };
Array.Reverse(nums);
Console.WriteLine(nums[0]);

What does nums[0] print after Reverse?
```
int[] nums = { 1, 2, 3 };
Array.Reverse(nums);
Console.WriteLine(nums[0]);
```
- 1
- 2
- 3
- 0
Show answer

3 — Correct. Reverse turns {1,2,3} into {3,2,1}; nums[0] is now 3.
Match each expression to its meaning

Array.Reverse(nums)

Reverses order
Array.Sort(nums)

Sorts ascending
Sort + Reverse

Sorts descending
nums[0]

First element

Next lesson: Array.IndexOf

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