Can someone help plzz

here is your answer in c#:

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Runtime.CompilerServices;

using System.Security.Cryptography.X509Certificates;

namespace CSACTUALDEMO

{

   class Program

   {

       public static int a;

       public static int b;

       public static void Main()

       {

           int cases = int.Parse(Console.ReadLine());

           int gradeseries = 1;

           List<int> myList = new List<int>();

           for (int forloop = 0; forloop <= cases; forloop++)

           {

               a = int.Parse(Console.ReadLine());

               Console.WriteLine($"Enter grade # { gradeseries++}: { a } ");

               myList.Add(a);

           }

           Console.WriteLine($"The maximum value is:  {myList.Max()}");

           Console.WriteLine($"The minimum value is: {myList.Max()}");

           Console.WriteLine($"The mean is: {myList.Sum() / cases}");

           Console.WriteLine($"The grades in forward order are:");

           foreach (int a in myList)

           {

               Console.WriteLine();

           }

           myList.Reverse();

           Console.WriteLine($"grades in reverse order: {myList}");

       }

   }

} Explanation:

they really not common the os x is just a better version of the os like in iphone theirs xr and their xs