LinkedList, Visual Basic

LinkedList

'Rextester.Program.Main is the entry point for your code. Don't change it.
'Compiler version 11.0.50709.17929 for Microsoft (R) .NET Framework 4.5

Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Text.RegularExpressions

Namespace Rextester
  Public Module Program
    
    Const MAXNODE = 50
    Const NullPointer = 0

Structure node
        Dim Data As Integer
        Dim Pointer As Integer
    End Structure

Dim List(MAXNODE) As node
    Dim StartPointer As Integer
    Dim FreeListPtr As Integer

Sub InitJosephus(n as integer)
        Dim i As Integer
        List(0).Data = 0
        for i = 1 to n
            InsertNode(n - i + 1)
        next
    End Sub

Sub InitialiseList()
       StartPointer = NullPointer
       FreeListPtr = 1
       Dim index as Integer
       FOR Index = 1 TO MAXNODE - 2
          List(Index).Pointer = Index + 1
       next
       List(MAXNODE - 1).Pointer = NullPointer
    End Sub

Sub InsertNode(NewItem as Integer)
      Dim NewNodePtr, ThisNodePtr, PreviousNodePtr as Integer      
      
      IF FreeListPtr <> NullPointer THEN
        NewNodePtr = FreeListPtr
        List(NewNodePtr).Data = NewItem
        FreeListPtr = List(FreeListPtr).Pointer
        ThisNodePtr = StartPointer
        PreviousNodePtr = StartPointer
      
        WHILE ThisNodePtr <> NullPointer AND List(ThisNodePtr).Data < NewItem
          PreviousNodePtr = ThisNodePtr
          ThisNodePtr = List(ThisNodePtr).Pointer
        END WHILE  
        
        IF PreviousNodePtr = StartPointer THEN
           List(NewNodePtr).Pointer = StartPointer
           StartPointer = NewNodePtr             
        ELSE
           List(NewNodePtr).Pointer = List(PreviousNodePtr).Pointer
           List(PreviousNodePtr).Pointer = NewNodePtr
        END IF        
      END IF 
    END Sub

Sub OutputAllNodes()
        Dim CurrentNodePtr As Integer = StartPointer
        Console.WriteLine()
        Console.writeLine("All nodes are:")
        While CurrentNodePtr <> 0
            console.write(" {0} {1}  ", List(CurrentNodePtr).Data, List(CurrentNodePtr).Pointer)
            CurrentNodePtr = List(CurrentNodePtr).Pointer
        End While
        Console.writeLine()
    End Sub

Sub Main(args() As string)
        InitialiseList()
        InitJosephus(5) 'InitJosephus(41)
        OutputAllNodes()
    End Sub
  End Module
End Namespace


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