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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 Public Sub SetLastRoll() Form2.Label2.Enabled = False Form2.Text2.Enabled = False End Sub Public Sub ResetLastRoll() Form2.Label2.Enabled = True Form2.Text2.Enabled = True End Sub Public Sub Initialize() Wins = 0 Losses = 0 Form1.Text1.Text = "0" Form1.Text2.Text = "0" Randomize End Sub
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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 Else Form2.Label3.Caption = "Please Throw the Dice Again" ResetLastRoll ResetButtons End If Form2.Show End Sub
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Private Sub Command2_Click() End End Sub
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Private Sub Command1_Click() NextScore = ThrowDice() Text2.Text = Str(NextScore) If (NextScore = FirstScore) Then Label3.Caption = "You Win" Wins = Wins + 1 SetButtons ElseIf (NextScore = 7) Then Label3.Caption = "You Lose" Losses = Losses + 1 SetButtons End If End Sub Private Sub Command2_Click() Form1.Text1 = Str(Wins) Form1.Text2 = Str(Losses) Form2.Hide End Sub
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Notice that the declarations and procedure definitions within Module1 are all Public, so that they can be accessed within both Form1 and Form2. Also, note that the references to the various procedures are written somewhat differently in this version of the code, since the procedure definitions and the procedure references are contained in different modules. Fig. 7.20 shows the opening dialog box when the program is executed. Clicking on New Game will result in another dialog box, similar to that shown in Fig. 7.21. (Fig. 7.21 shows the dialog box that results from winning on the first throw. Other dialog boxes are similar.) Note that the only choice shown in Fig. 7.21 is to return to the opening dialog box, since this particular game has ended with a win. Also, note that the last roll (i.e., the roll following the first roll) box is disabled, since this particular game required only one roll of the dice.
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Fig. 7.20
Fig. 7.21
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If the first roll of the dice results in neither a win nor a loss, a succession of dialog boxes similar to that shown in Fig. 7.22 will appear until a win or a loss is finally encountered, as shown in Fig. 7.23. While the game is in progress, the only choice shown in Fig. 7.22 is OK (meaning throw the dice again). This continues until the game has ended.
Fig. 7.22
Fig. 7.23
Once the game has ended, the OK button is disabled and the Return button becomes active, as shown in Fig. 7.23. (Note that the message has changed, indicating a win or a loss.) When the user clicks on the Return button, the original dialog box will reappear showing the current number of wins and losses, as shown in Fig. 7.24.
Fig. 7.24
All three versions of this project produce the same output, as shown in Figs. 7.20 through 7.24. Hence, the coding style is transparent to the user, as expected. From a programmer s perspective, however, it is instructive to compare all three versions of the code, particularly the global declarations, the procedure definitions, and the procedure references. There are subtle differences in the use of Public and Private declarations, and in the manner in which the procedures and global variables are accessed in various places within the code.
7.6 OPTIONAL ARGUMENTS When accessing a procedure, the passing of one or more arguments can be made optional. To do so, each optional argument declaration within the first line of the procedure definition must be preceded by the keyword Optional. For example, if a sub procedure is defined with one mandatory argument and one optional argument, the first line of the procedure declaration will be
Sub procedure name (argument1 As data type1, Optional argument2 As data type2)
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