Rotate a Array

using System;

namespace ConsoleApplication2
{
    class Program
    {
        //Function to reverse arr[] from index start to end
        static void reverseArray(int[] arr, int start, int end)
        {
            int i;
            int temp;
            while (start < end)
            {
                temp = arr[start];
                arr[start] = arr[end];
                arr[end] = temp;
                start++;
                end--;
            }
        }

        //Function to left rotate arr[] of size n by d
        static void leftRotate(int[] arr, int d, int n)
        {
            reverseArray(arr, 0, d - 1);
            reverseArray(arr, d, n - 1);
            reverseArray(arr, 0, n - 1);
        }

        // Function to print an array
        static void printArray(int[] arr, int size)
        {
            int i;
            for (i = 0; i < size; i++)
                Console.WriteLine(arr[i]);
        }

        //Driver program to test above functions
        static void Main(string[] args)
        {
            int[] arr = new[] { 4, 8, 15, 16, 23, 42, 99 };

            leftRotate(arr, 3, 7);
            printArray(arr, 7);
        }
    }
}

// Found on Internet