auto generate barcode vb net SUB PROCEDURES (SUBROUTINES) In its simplest form, a sub procedure is written as in Visual Studio .NET

Creating QR in Visual Studio .NET SUB PROCEDURES (SUBROUTINES) In its simplest form, a sub procedure is written as

7.2 SUB PROCEDURES (SUBROUTINES) In its simplest form, a sub procedure is written as
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Sub procedure name (arguments) . . . . .
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. . . . . End Sub 168
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PROCEDURES
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The procedure name must follow the same naming convention used with variables (see Sec. 2.3). In addition, a procedure name cannot be identical to a constant or variable name within the same module. The list of arguments is optional. Arguments represent information that is transferred into the procedure from the calling statement. Each argument is written as a variable declaration; i.e., argument name As data type The data type can be omitted if the argument is a variant. Multiple arguments must be separated by commas. If arguments are not present, an empty pair of parentheses must appear in the Sub statement.
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EXAMPLE 7.1 DEFINING A SUB PROCEDURE
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Here is a sub procedure that determines the smallest of two numbers.
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Sub Smallest(a, b) Dim Min If (a < b) Then Min = a MsgBox "a is smaller (a = " & Str(Min) & ")" ElseIf (a > b) Then Min = b MsgBox "b is smaller (b = " & Str(Min) & ")" Else Min = a MsgBox "Both values are equal (a, b = " & Str(Min) & ")" End If End Sub
This procedure has two arguments, a and b. Both are variants. The procedure compares the values of the arguments, determines which is smaller, and then displays the value of the smaller argument in a message box. Note that the variable Min is a variant that is defined locally within the procedure. It represents the smallest value among the arguments. This variable is not required in this example (we could simply use a or b instead). However, it is a good idea to include this variable, in case the procedure should be expanded to process the minimum value in some manner without altering the given values of the arguments. Also, note that we could also have included explicit data typing in the first two lines; i.e.,
Sub Smallest(a As Variant, b As Variant) Dim Min As Variant
or, if we choose a different data type,
Sub Smallest(a As Single, b As Single) Dim Min As Single
etc., if we wished.
A sub procedure can be accessed from elsewhere within the module via the Call statement. The Call statement is written
Call procedure name (arguments)
The list of arguments in the Call statement must agree with the argument list in the procedure definition. The arguments must agree in number, in order, and in data type. However, the respective names may be
PROCEDURES
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different. Thus, if the procedure definition includes three arguments whose data types are single, integer, and string, the Call statement must also contain three arguments whose data types are single, integer, and string, respectively. The names of the arguments within the procedure definition need not, however, be the same as the names of the arguments in the Call statement. For example, the arguments within the procedure definition might be named a, b and c, whereas the corresponding arguments within the Call statement might be called x, y and z. Here is another way to access a sub procedure. procedure name arguments Note the absence of the keyword Call, and the absence of parentheses. When the procedure is accessed, the values of the arguments within the calling portion of the program become available to the arguments within the procedure itself. Thus, the values of the arguments are transferred from the calling portion of the program to the procedure. Moreover, if the value of an argument is altered within the procedure, the change will be recognized within the calling portion of the program. (Actually, it is the addresses of the arguments that are shared; hence, the contents of those addresses can be accessed from either the calling portion of the program or from within the procedure itself.) This type of transfer is called passing by reference.
EXAMPLE 7.2 ACCESSING A SUB PROCEDURE (SMALLEST OF TWO NUMBERS)
Here is a complete Visual Basic program that makes use of the sub procedure given in Example 7.1. The program determines the smallest of two numbers and then displays the result. Fig. 7.1 shows the preliminary control layout.
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