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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