Program: Rotate array to the right given a pivot

using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
 namespace CodingAlgorithm
 {
  public static class RotateArrayRight
  {
  //Rotate array to the right of a given pivot
  public static int[] Rotate(int[] x, int pivot)
  {
  if (pivot < 0 || x == null)
  throw new Exception("Invalid argument");
 
  pivot = pivot % x.Length;
 
  //Rotate first half
  x = RotateSub(x, 0, pivot - 1);
 
  //Rotate second half
  x = RotateSub(x, pivot, x.Length - 1);
 
  //Rotate all
  x = RotateSub(x, 0, x.Length - 1);
 
  return x;
  }
 
  private static int[] RotateSub(int[] x, int start, int end)
  {
  while (start < end)
  {
  int temp = x[start];
  x[start] = x[end];
  x[end] = temp;
  start++;
  end--;
  }
  return x;
  }
  }
 }

Source: csharpstar

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