using System;

namespace TestApp
{
	public class Sinif
	{
		private int[] ogrenciNumaralari;
		public int[] OgrenciNumaralari{
			set{
				ogrenciNumaralari=value;
			}
		}
		public int Length{
			get{
				return ogrenciNumaralari.Length;
			}
		}
		public int this[int i]{
			get{
				if(i>-1&&i<ogrenciNumaralari.Length){
					return ogrenciNumaralari[i];
				}else{
					throw new IndexOutOfRangeException("Hatalı İndex");	
				}
			}
			set{
				if(i>-1&&i<ogrenciNumaralari.Length){
					ogrenciNumaralari[i]=value;
				}else{
					throw new IndexOutOfRangeException("Hatalı İndex");	
				}
			}
		}
		public static void Main(string[] args){
			int[] numaralar=new int[]{12,13,45,56,78,90};
			Sinif sinif=new Sinif();
			sinif.OgrenciNumaralari=numaralar;
			sinif[0]=10;
			for(int i=0;i<sinif.Length;i++){
				Console.WriteLine(sinif[i]);
			}
		}
	}
}