We can assign values to the members of the subscripted variables in the following manner. in .NET framework

Maker QR Code ISO/IEC18004 in .NET framework We can assign values to the members of the subscripted variables in the following manner.

EXAMPLE 8.5
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Consider the user-defined data type and the accompanying arrays, first introduced in Example 8.3; i.e.,
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Type Customer CustomerName As String AcctNo As Integer Balance As Single End Type Dim OldCustomer(100) As Customer, NewCustomer(100) As Customer Dim i As Integer, j As Integer
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We can assign values to the members of the subscripted variables in the following manner.
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ARRAYS
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OldCustomer(5).CustomerName = "Smith" OldCustomer(i).AcctNo = 1215 OldCustomer(i + 3).Balance = 44.75
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NewCustomer(2).CustomerName = "Jones" NewCustomer(j).AcctNo = 1610 NewCustomer(i + j).Balance = 187.32
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and so on.
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EXAMPLE 8.6 MULTILINGUAL HELLO USING AN ARRAY
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Here is a variation of Example 4.9, in which the user selects a language from a combo box and an appropriate hello greeting is displayed within a text box. In Example 4.9 we used a Select Case structure to place the proper greeting in the text box. Now we will simplify the code by placing the greetings in an array, and then assigning the proper array element to the text box. Recapping from Example 4.9, Fig. 8.3 shows the preliminary Form Design Window layout. Fig. 8.4 shows the Form Design Window after assigning the initial property values listed below.
Fig. 8.3
Fig. 8.4
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ARRAYS
Object Form1 Label1 Combo1
Property Caption Caption Font Text List
Value Multilingual Hello 3 Say Hello, in . . . MS Sans Serif, 10-point Language . . . French (press Control-Enter after each list entry) German Hawaiian Hebrew Italian Japanese Spanish MS Sans Serif, 10-point (blank) Gray 0 None MS Sans Serif, 14-point Quit MS Sans Serif, 10-point
Font Text1 Text BackColor BorderStyle Font Caption Font
Command1
Now consider the event procedure associated with the combo box.
Private Sub Combo1_Click() Dim Hello(6) As String 'assign the array elements Hello(0) = "Bonjour" Hello(1) = "Guten Tag" Hello(2) = "Aloha" Hello(3) = "Shalom" Hello(4) = "Buon Giorno" Hello(5) = "Konichihua" Hello(6) = "Buenos Dias" 'assign one array element to the text box Text1.Text = Hello(Combo1.ListIndex) End Sub
This procedure first assigns the appropriate greetings to the array elements. The appropriate array element is then assigned to Text1.Text, as determined by the value of Combo1.ListIndex. (Note that the value assigned to Combo1.ListIndex is determined at run time, when the user clicks on an entry within the combo box.) It is interesting to compare this event procedure with the corresponding event procedure shown in Example 4.9. The present version is shorter and logically more straightforward, since the Select Case structure is not required. In general, the degree of simplification obtained by using arrays increases with the complexity of the code. The command button is used to end the computation. Hence, its event procedure is very simple, as shown below.
Private Sub Command1_Click() End End Sub
ARRAYS
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When the program is executed, the combo box appears, showing the title Language . . . in the text-box area, as shown in Fig. 8.5. The user may then click on the downward-pointing arrow, resulting in the list of languages shown in Fig. 8.6. When the user selects one of these entries, the corresponding greeting appears within the text box, to the right of the dropdown window. Fig. 8.7 shows what happens when the user selects Italian from the list in the drop-down window. Thus, we see that the hello greeting in Italian is Buon Giorno.
Fig. 8.5
Fig. 8.6
Fig. 8.7
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ARRAYS
Before leaving this example, we present another way to write the event procedures. In principle, this method is more efficient, since the array elements are assigned their string values only once, when the form is loaded. As a practical matter, however, either version of the code will behave in the same manner.
Dim Hello(6) As String Private Sub Form_Load() 'initialize the array elements Hello(0) = "Bonjour" Hello(1) = "Guten Tag" Hello(2) = "Aloha" Hello(3) = "Shalom" Hello(4) = "Buon Giorno" Hello(5) = "Konichihua" Hello(6) = "Buenos Dias" End Sub
Private Sub Combo1_Click() Text1.Text = Hello(Combo1.ListIndex) End Sub Private Sub Command1_Click() End End Sub
8.4 PASSING ARRAYS TO PROCEDURES
Arrays can be passed to procedures as arguments, in much the same manner as ordinary variables are passed as arguments. If an argument is an array, however, an empty pair of parentheses must follow the array name. This requirement must be satisfied in both the procedure access and the first line of the procedure definition, as illustrated in the following example.
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