lab 4 sharp

using System;

namespace lab_4
{
    class Safearray
{
    readonly int LIMIT = 12;
    protected int[] Arr;
    public int getLimit()
    {
        return LIMIT;
    }
    public Safearray()
{
    Arr = new int[LIMIT];
}
public int this[int n]
{
    get
        {
            if ((n < 0) || (n > LIMIT))
            {
                Console.Write("\nОшибочный индекс!");
                return 0;
            }
            else
            {
                return Arr[n];
            }
        }
    set
    {
        if ((n < 0) || (n > LIMIT))
        {
            Console.Write("\nОшибочный индекс!");
        }
        else
        {
            Arr[n] = value;
        }
}}
class Safehilo : Safearray {
    private int low;
    private int high;
    public Safehilo(int low, int high):base() {
        this.low=low;
        this.high=high;
        Arr=new int[high-low];
    }
    public int this[int n]
{
    get
        {
            if ((n < low) || (n >= high))
            {
                Console.Write("\nОшибочный индекс!");
                return 0;
            }
            else
            {
                return Arr[n-low];
            }
        }
    set
    {
        if ((n < low) || (n >= high))
        {
            Console.Write("\nОшибочный индекс!");
        }
        else
        {
            Arr[n-low] = value;
        }
}
}}
    class Program
    {
        static void Main(string[] args)
        {
            //Console.WriteLine("Hello World!");
            string low, high;
            Console.WriteLine("Enter low: ");
            low=Console.ReadLine();
            Console.WriteLine("Enter high: ");
            high=Console.ReadLine();
            int l=Convert.ToInt32(low);
            int h=Convert.ToInt32(high);
            Safehilo mas=new Safehilo(l, h);
            for (int i=0; i<(h-l); i++){
                    mas[l+i]=i;
                    Console.WriteLine("mas[{0}]: {1}", l+i, mas[l+i]);
            }
            Console.WriteLine(mas[l+3]);
        }
    }
}}