how define (number range) enum in c#

Question

hi all
I define the type with ENUM in number range [1-n] n is the Maximum number.
I will define this range to specify the array.

string[] array1=new string[1-n] // means start index for this array is 1 and finish index is n
how define this range?

similar this Pascal code[partion of algorithm Buddy System Allocation memory]

CONST NULL = -1;
TYPE address: NULL..m;
   sizeindex: 1..n;
VAR
   size : array[sizeindex] of 1..m;
   subbuddy : array[sizeindex] of 0..n;
   memory : array[0..m] of paced record
   tag: (available,allocated);
   a,b: (left,right):
   index: sizeindex;
   forward: address;
   backward: address;
   end;

tanks a lot.

Vulpes · Answer

That's fine if you're just doing a simulation. I thought you might be hoping to allocate managed memory 'for real' :)

hamed hossani · Answer

hi I create simulation of buddy system allocation memoryvery simplebased on this pdf(section 2 only)[ http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.79.6369&rep=rep1&type=pdf ] its display the process that inputwe added input process and display into DataGridViewfinally display added process to a PictureBox. this is project for lab OS. similar this link: http://www.codeproject.com/KB/threads/PriorityQueueGeneric.aspx tanks

Vulpes · Answer

In .NET all arrays have a lower bound of zero by default. It's possible to define arrays with different lower bounds but they are inefficient and C# doesn't have any special syntax to deal with them. However here's how you'd define a single dimensional array of ints with a lower bound of 1 and an upper bound of n which is linked to an enum value: using System; enum Range { One = 1 Two Three Four Five } class Test { static void Main() { int n = (int)Range.Five; int[] lengths = new int[1]{n}; int[] lowerBounds = new int[1]{1}; Array oneBased = Array.CreateInstance(typeof(int) lengths lowerBounds); // populate array with ints from 1 to n // can't use oneBase[i] = i syntax for this for(int i = 1; i { oneBased.SetValue(ii); } // iterate through array foreach(int i in oneBased) Console.Write({0}  i); Console.WriteLine(); // get value at a particular index int j = (int)oneBased.GetValue((int)Range.Three); Console.WriteLine(j); Console.ReadKey(); } } Also it's not possible to do your own managed memory allocation in .NET - the system does it automatically for you. The nearest we have to the Buddy system are dymamic collections such as List which use an array of T as a backing store and double the size of this store as needed when new elements are added. If you're wanting to do your own memory allocation in a language other than Pascal then the best option is C/C++ though you can use C# to create an unmanaged memory block (Marshal.AllocHGlobal) and then use pointers (in unsafe code) to manipulate it.