Removed spaces from top-level directory names.

Spaces tend to cause annoyances in a Unix-style shell environment.
This change fixes that.

73_Reverse/vbnet/Reverse.vb

@@ -0,0 +1,195 @@
+Imports System
+
+Module Reverse
+
+
+    '  VB.NET Port of Reverse from book BASIC COMPUTER GAMES.
+    '  Console app for .NET Core 3.1
+    '  Some simplification and error checking was added.
+    '  David Widel
+
+    Const NumberOfDigits As Integer = 9
+
+    Private Numbers As New Generic.List(Of Integer)
+
+
+
+    Sub Main(args As String())
+
+        DisplayIntro()
+
+        Console.WriteLine("DO YOU WANT THE RULES? (Y/N)")
+        If Console.ReadKey(True).Key = ConsoleKey.Y Then
+            DisplayRules()
+        End If
+
+
+
+        Dim playing As Boolean = True
+
+        Do While (playing)  ' New game loop.
+
+            InitializeRandomNumberList()
+
+            Console.WriteLine("HERE WE GO ... THE LIST IS:")
+            DisplayNumbers()
+
+            Dim Counter As Integer = 0
+
+            While True ' Turn loop.
+
+                Dim ReverseNumber As Integer = GetHowManyToReverse()
+                If ReverseNumber = 0 Then
+                    If Not TryAgain() Then
+                        playing = False
+                    End If
+                    Continue Do
+                End If
+
+                PerformReverse(ReverseNumber)
+                Counter += 1
+                DisplayNumbers()
+
+                If DidPlayerWin() Then
+                    Console.WriteLine("YOU WON IN " & Counter.ToString & " MOVES")
+                    If Not TryAgain() Then
+                        Console.WriteLine("O.K. HOPE YOU HAD FUN!!")
+                        playing = False
+                    End If
+                    Continue Do
+                End If
+
+            End While
+
+        Loop
+
+
+
+
+    End Sub
+
+    Sub DisplayIntro()
+        Console.WriteLine("REVERSE")
+        Console.WriteLine("CREATIVE COMPUTING    MORRISTOWN, NEW JERSEY")
+        Console.WriteLine("REVERSE -- A GAME OF SKILL")
+
+
+    End Sub
+
+    Sub DisplayRules()
+
+        Console.WriteLine("THIS IS THE GAME OF REVERSE. TO WIN, ALL YOU HAVE")
+        Console.WriteLine("TO DO IS ARRANGE A LIST OF NUMBERS (1 THROUGH " & NumberOfDigits.ToString & ")")
+        Console.WriteLine("IN NUMERICAL ORDER FROM LEFT TO RIGHT. TO MOVE, YOU")
+        Console.WriteLine("TELL ME HOW MANY NUMBERS (COUNTING FROM THE LEFT) TO")
+        Console.WriteLine("REVERSE. FOR EXAMPLE, IF THE CURRENT LIST IS:")
+        Console.WriteLine()
+        Console.WriteLine("2 3 4 5 1 6 7 8 9")
+        Console.WriteLine()
+        Console.WriteLine("AND YOU REVERSE 4, THE RESULT WILL BE:")
+        Console.WriteLine()
+        Console.WriteLine("5 4 3 2 1 6 7 8 9")
+        Console.WriteLine()
+        Console.WriteLine("NOW IF YOU REVERSE 5, YOU WIN!")
+        Console.WriteLine()
+        Console.WriteLine("1 2 3 4 5 6 7 8 9")
+        Console.WriteLine()
+        Console.WriteLine()
+        Console.WriteLine()
+        Console.WriteLine("NO DOUBT YOU WILL LIKE THIS GAME, BUT")
+        Console.WriteLine("IF YOU WANT TO QUIT, REVERSE O (ZERO).")
+        Console.WriteLine()
+
+    End Sub
+
+    Sub InitializeRandomNumberList()
+
+        Dim R As New Random
+        Numbers.Clear()
+
+        Do Until Numbers.Count = NumberOfDigits
+
+            Dim NewNumber = R.Next(1, NumberOfDigits + 1) 'Lower bound is inclusive, Upper bound is exclusive
+
+            If Not Numbers.Contains(NewNumber) Then
+                Numbers.Add(NewNumber)
+            End If
+
+        Loop
+
+
+        If DidPlayerWin() Then
+            Numbers.Reverse()
+        End If
+
+    End Sub
+
+    Private Sub DisplayNumbers()
+        For i As Integer = 0 To Numbers.Count - 1
+            Console.Write(Numbers(i).ToString(" #"))
+        Next
+        Console.WriteLine()
+    End Sub
+
+    Function GetHowManyToReverse() As Integer
+        Console.WriteLine("HOW MANY SHALL I REVERSE?")
+
+        Do
+
+            Dim K = Console.ReadLine
+            Dim ReverseNumber As Integer
+
+            If Integer.TryParse(K, ReverseNumber) Then
+                If ReverseNumber <= NumberOfDigits Then
+                    Return ReverseNumber
+                Else
+                    Console.WriteLine("OOPS! TOO MANY! I CAN REVERSE AT MOST " & NumberOfDigits.ToString)
+                End If
+            Else
+                'Added check.
+                Console.WriteLine("OOPS! NUMBERS PLEASE!")
+            End If
+
+        Loop
+
+    End Function
+
+    Sub PerformReverse(ReverseNumber As Integer)
+
+        ' We will make pointers to the 2 digits to swap, swap them, and converge the pointers.
+        Dim LowerPointer As Integer = 1
+        Dim UpperPointer As Integer = ReverseNumber
+
+        Do
+            'Since our list begins at 0 we must always subtract one to access a digit.
+            Dim temp As Integer = Numbers(LowerPointer - 1)
+            Numbers(LowerPointer - 1) = Numbers(UpperPointer - 1)
+            Numbers(UpperPointer - 1) = temp
+            LowerPointer += 1
+            UpperPointer -= 1
+
+        Loop Until UpperPointer <= LowerPointer
+
+    End Sub
+
+    Function DidPlayerWin() As Boolean
+        For i As Integer = 0 To Numbers.Count - 2
+            If Numbers(i) > Numbers(i + 1) Then Return False
+        Next
+        Return True
+    End Function
+
+
+    Private Function TryAgain() As Boolean
+        Console.WriteLine("TRY AGAIN? (Y OR N)")
+        If Console.ReadKey(True).Key = ConsoleKey.Y Then
+            Return True
+        Else
+            Return False
+        End If
+    End Function
+
+
+
+
+End Module