# How to rotate an array k time using C#?

CsharpServer Side ProgrammingProgramming

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]);
}
}
3 2 1 9 8 7 6 5 4