How to rotate an array k time using C#?

Given an array and number k, the problem states that we have to rotate the array k times.

If the given number is 3 then the array must be rotated 3 times.

Create a function reverse which takes the array, start and end as a parameter.

• In the 1st step call reverse method from 0 to array length.

• In the 2nd step call the reverse method from 0 to k-1.

• In the 3rd step call the reverse method from k+1 to array length.

Example

 Live Demo

using System; namespace ConsoleApplication{    public class Arrays{       public void ReverseArrayKTimes(int[] arr, int k){          Reverse(arr, 0, arr.Length - 1);          Reverse(arr, 0, k - 1);          Reverse(arr, k, arr.Length - 1);       }       private void Reverse(int[] arr, int start, int end){          while (start < end){             int temp = arr[start];             arr[start] = arr[end];             arr[end] = temp;             start++;             end--;          }       }    }    class Program{       static void Main(string[] args){          Arrays a = new Arrays();          int[] arr = { 9, 8, 7, 6, 5, 4, 3, 2, 1 };          a.ReverseArrayKTimes(arr, 3);          for (int i = 0; i < arr.Length; i++){             Console.WriteLine(arr[i]);          }          Console.ReadLine();       }    } }

Output

3 2 1 9 8 7 6 5 4