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The second event procedure, Command1_Click, is more complicated. It first rolls the dice once, and then initializes a number of controls within Form2. the If-ElseIf-Else structure contains appropriate assignments for an initial win within each game, and an initial loss within each game. In the event that the first roll of the dice does not result in either a win or a loss, the controls within Form2 are reset, in preparation for additional rolls of the dice. Then the result of the initial roll is displayed in Form2. Finally, the last event procedure, Command2_Click, simply ends the computation. Now let us turn our attention to the event procedures associated with Form2, as shown below.
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Private Sub Command1_Click() NextScore = Form1.ThrowDice() Text2.Text = Str(NextScore) If (NextScore = Form1.FirstScore) Then Label3.Caption = "You Win" Form1.Wins = Form1.Wins + 1 Command1.Enabled = False Command2.Enabled = True ElseIf (NextScore = 7) Then Label3.Caption = "You Lose" Form1.Losses = Form1.Losses + 1 Command1.Enabled = False Command2.Enabled = True End If End Sub Private Sub Command2_Click() Form1.Text1 = Str(Form1.Wins) Form1.Text2 = Str(Form1.Losses) Form2.Hide End Sub
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Within Form2, command button Command1 will be active only if additional rolls of the dice are required (because the first roll resulted in neither a win nor a loss). Command1_Click simulates one additional roll of the dice. If this roll results in a win, the wins counter is incremented, an appropriate message is displayed, Command1 is disabled, and Command2 is enabled. And if the additional roll results in a loss, the losses counter is incremented, a message is displayed, Command1 is disabled, and Command2 is enabled. On the other hand, if the additional roll results in neither a win nor a loss, nothing happens, because another roll of the dice will be required. Hence, Command1 remains enabled and Command2 remains disabled. Unfortunately, the logic within the code is not as clear as it might be, because of the numerous statements that either enable or disable certain controls (specifically, Label2, Text2, and the two command buttons) within Form2. This situation can be remedied somewhat by introducing four additional sub procedures that enable or disable the Form2 controls. We can also add a sub procedure to carry out the initial assignments within Form1. Here is the modified code, with the additional procedures (called Initialize, SetButtons, ResetButtons, SetLastRoll and ResetLastRoll) added to the Form1 code.
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Public FirstScore As Integer, NextScore As Integer Public Wins As Integer, Losses As Integer
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Private Sub Initialize() Wins = 0 Losses = 0 Text1.Text = "0" Text2.Text = "0" Randomize End Sub Public Sub SetButtons() Form2.Command1.Enabled = False Form2.Command2.Enabled = True End Sub Public Sub ResetButtons() Form2.Command1.Enabled = True Form2.Command2.Enabled = False End Sub Private Sub SetLastRoll() Form2.Label2.Enabled = False Form2.Text2.Enabled = False End Sub Private Sub ResetLastRoll() Form2.Label2.Enabled = True Form2.Text2.Enabled = True End Sub
Public Function ThrowDice() As Integer Dim d1 As Integer, d2 As Integer d1 = 1 + Int(6 * Rnd) d2 = 1 + Int(6 * Rnd) ThrowDice = d1 + d2 End Function Private Sub Form_Load() Initialize End Sub Private Sub Command1_Click() FirstScore = ThrowDice() SetLastRoll SetButtons Form2.Text1.Text = Str(FirstScore) Form2.Text2.Text = "" If (FirstScore = 7 Or FirstScore = 11) Then Form2.Label3.Caption = "Congratulations! You Win on the First Throw" Wins = Wins + 1 ElseIf (FirstScore = 2 Or FirstScore = 3 Or FirstScore = 12) Then Form2.Label3.Caption = "Sorry, You Lose on the First Throw" Losses = Losses + 1
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Else Form2.Label3.Caption = "Please Throw the Dice Again" ResetLastRoll ResetButtons End If Form2.Show End Sub Private Sub Command2_Click() End End Sub
Form2
Private Sub Command1_Click() NextScore = Form1.ThrowDice() Text2.Text = Str(NextScore) If (NextScore = Form1.FirstScore) Then Label3.Caption = "You Win" Form1.Wins = Form1.Wins + 1 Form1.SetButtons ElseIf (NextScore = 7) Then Label3.Caption = "You Lose" Form1.Losses = Form1.Losses + 1 Form1.SetButtons End If End Sub Private Sub Command2_Click() Form1.Text1 = Str(Form1.Wins) Form1.Text2 = Str(Form1.Losses) Form2.Hide End Sub
Finally, it may be desirable to place the global declarations (FirstScore, NextScore, Wins and Losses), the function procedure (ThrowDice), and the sub procedures (Initialize, SetButtons, ResetButtons, SetLastRoll and ResetLastRoll) within a separate module. Here is the code based upon this modification. Module1
Public FirstScore As Integer, NextScore As Integer Public Wins As Integer, Losses As Integer Public Function ThrowDice() As Integer Dim d1 As Integer, d2 As Integer d1 = 1 + Int(6 * Rnd) d2 = 1 + Int(6 * Rnd) ThrowDice = d1 + d2 End Function
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