Public Red Private Sub FirstSub() . . . . . Red = 3 or Form1.Red = 3 Form2.Green = 6 End Sub in .NET framework

Creator QR Code in .NET framework Public Red Private Sub FirstSub() . . . . . Red = 3 or Form1.Red = 3 Form2.Green = 6 End Sub

EXAMPLE 7.9
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Now consider two different modules that contain public variables. The following skeletal outline illustrates how these variables can be utilized within each module. Form Module 1
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Public Red Private Sub FirstSub() . . . . . Red = 3 or Form1.Red = 3 Form2.Green = 6 End Sub
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Form Module 2
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Public Green Private Sub SecondSub() . . . . . Form1.Red = 7 Green = 2 or Form2.Green = 2 End Sub
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PROCEDURES
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[CHAP. 7
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Once the actions defined within a procedure have been completed and control is returned to the remote access point, the values assigned to the local variables within the procedure are not retained. There are situations, however, in which it may be desirable for a local variable to retain its value between procedure calls. This can be accomplished by declaring the variable to be Static; e.g.,
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Static variable name As data type
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Note that Static is used in place of Dim. All of the variables within a procedure can be made to retain their values by declaring the entire procedure to be Static; for example,
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Private Static Sub procedure name (arguments) Public Static Function procedure name (arguments) As data type
and so on. In these examples, note that Static appears in addition to Private or Public. Sometimes the program logic requires that a procedure be exited if some logical condition is satisfied, without executing all of the instructions within the procedure. This can be accomplished with an Exit Sub or Exit Function statement; e.g.,
Private Sub procedure name (arguments) . . . . . If (logical condition) Then Exit Sub Else . . . . . End If End Sub
Function procedures operate in the same manner, except that Exit Function replaces Exit Sub.
EXAMPLE 7.10 SHOOTING CRAPS
Craps is a popular dice game in which you throw a pair of dice one or more times until you either win or lose. The game can be simulated on a computer by substituting the generation of random numbers for the actual throwing of the dice. There are two ways to win in craps. You can throw the dice once and obtain a score of either 7 or 11; or you can obtain a 4, 5, 6, 8, 9 or 10 on the first throw and then repeat the same score on a subsequent throw before obtaining a 7. Similarly, there are two ways to lose. You can throw the dice once and obtain a 2, 3 or 12; or you can obtain a 4, 5, 6, 8, 9 or 10 on the first throw and then obtain a 7 on a subsequent throw before repeating your original score. We will develop the game interactively in Visual Basic, so that one throw of the dice will be simulated each time you click on a command button. A text box will indicate the outcome of each throw. At the end of each game, the cumulative number of wins and losses will be displayed. A command button will allow you to play again if you wish. Our program will require a random number generator that produces uniformly distributed integers between 1 and 6. (By uniformly distributed, we mean that any integer between 1 and 6 is just as likely to occur as any other integer within this range.) To do so, we will make use of the Rnd library function, which generates fractional random numbers that are uniformly distributed between 0 and 1. We will also utilize the Randomize function, which is used to initialize the random number generator. Now let us see how we can convert these random numbers into something that simulates throwing a pair of dice. We can generate a random integer, uniformly distributed between 0 and 5, by writing Int(6 * Rnd). Hence, to obtain a random integer that is uniformly distributed between 1 and 6, we simply add 1 to this expression; that is, we write 1 + Int(6 * Rnd). The value returned by this expression will represent the result of throwing a single die. To simulate throwing a pair of dice, we repeat the random number generation; that is, we evaluate the above expression twice, once for
CHAP. 7]
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