Reverse { 1, 2, 3, 4, 5 } in-place and print elements.
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using System;
class Program
{
static void Main()
{
int[] arr = { 1, 2, 3, 4, 5 };
int left = 0, right = arr.Length - 1;
while (left < right)
{
(arr[left], arr[right]) = (arr[right], arr[left]);
left++; right--;
}
Console.WriteLine(string.Join(", ", arr));
}
}Prefer Coach (Nudge → Guide → Approach) before revealing. No forced signup.
Two-pointer swap from both ends—O(n/2) swaps. Tuple swap syntax is clean in modern C#.
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