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PASSING AN ENTIRE ARRAY TO A PROCEDURE in .NET framework
EXAMPLE 8.7 PASSING AN ENTIRE ARRAY TO A PROCEDURE Recognizing Quick Response Code In VS .NET Using Barcode Control SDK for .NET Control to generate, create, read, scan barcode image in .NET framework applications. Generate Denso QR Bar Code In Visual Studio .NET Using Barcode maker for VS .NET Control to generate, create QR Code JIS X 0510 image in VS .NET applications. Here is a skeletal structure of a Visual Basic program that passes an entire array to a sub procedure. The first n elements are then assigned numerical values within the procedure. Note that the array is called x in the calling portion of the program, and v within the procedure. This is permissible, as long as the array arguments are of the same size and the same data type, and they appear in the same relative location within each argument list. QR Code JIS X 0510 Reader In VS .NET Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET applications. Bar Code Maker In .NET Framework Using Barcode creator for .NET framework Control to generate, create barcode image in .NET applications. Dim x(10) As Integer, n As Integer . . . . . n = . . . . . Call Setup(x(), n) 'procedure reference 'or Setup x(), n Private Sub Setup(v() As Integer, n As Integer) Dim i As Integer For i = 0 to n v(i) = i ^ 2 Next i End Sub 'procedure definition Bar Code Decoder In .NET Framework Using Barcode reader for .NET Control to read, scan read, scan image in Visual Studio .NET applications. Generate QR Code ISO/IEC18004 In C# Using Barcode generator for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in .NET framework applications. Team-Fly
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Create EAN13 In VS .NET Using Barcode drawer for .NET Control to generate, create EAN13 image in Visual Studio .NET applications. Barcode Creation In .NET Using Barcode generator for Visual Studio .NET Control to generate, create barcode image in .NET applications. ARRAYS
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GTIN - 12 Printer In Java Using Barcode generator for Java Control to generate, create UPCA image in Java applications. Scan Code 128 Code Set C In None Using Barcode reader for Software Control to read, scan read, scan image in Software applications. Since the array elements are passed by reference, the values assigned to the array elements within the procedure will be recognized elsewhere within the program (e.g., in the calling portion of the program). Recognize UPC Symbol In Visual Studio .NET Using Barcode scanner for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications. UCC - 12 Maker In None Using Barcode generation for Software Control to generate, create UPC-A Supplement 5 image in Software applications. Individual array elements (i.e., subscripted variables) may also be passed to procedures as arguments. Subscripted variables are written in the normal manner when they appear as arguments within a procedure reference. The corresponding arguments in the first line of the procedure definition may be either subscripted variables or ordinary variables, depending on the program logic. ANSI/AIM Code 128 Printer In Visual C#.NET Using Barcode drawer for VS .NET Control to generate, create USS Code 128 image in .NET applications. Bar Code Drawer In None Using Barcode creation for Software Control to generate, create barcode image in Software applications. EXAMPLE 8.8 PASSING ARRAY ELEMENTS TO A PROCEDURE
UPC Symbol Generator In None Using Barcode encoder for Word Control to generate, create UPC Symbol image in Microsoft Word applications. GS1 - 13 Encoder In None Using Barcode creator for Microsoft Excel Control to generate, create European Article Number 13 image in Office Excel applications. This example illustrates how subscripted variables are passed to a procedure as arguments. In this case, we will assign single-precision values to the array elements 1 through 100 within the calling portion of the program. We then pass two consecutive array elements to the procedure, which returns the square root of the sum of their squares. This value is assigned to the first array element (i.e., array element x(0) ). Dim x(100) As Single, i As Integer, n As Integer For i = 1 To 100 x(i) = i Next i . . . . . n = . . . . . x(0) = Hypotenuse(x(n), x(n + 1)) . . . . . 'assign values to the array elements
'assign a value to n 'function reference
Private Function Hypotenuse(a As Single, b As Single) As Single Hypotenuse = Sqr(a ^ 2 + b ^ 2) End Function 'function definition
If n is assigned a value of 3, what value will be assigned to x(0) In the next example we see a complete Visual Basic project that passes both an entire array and a single array element as arguments. EXAMPLE 8.9 SMALLEST OF TWO NUMBERS
In Example 7.2 we saw a complete Visual Basic program allowing the user to enter two numbers. The program determined the smaller of the two and displayed the result within a message box. Here is a variation of that program in which we utilize a three-element, one-dimensional array x to hold the numbers. We will place the two input values in elements x(1) and x(2), and then tag the smaller value by placing it in x(0), which we will then send to a message box. The user interface will be unchanged from Example 7.2. Hence, the control layout will be identical to that shown in Figs. 7.1 and 7.2. Here is the new source code. Dim x(2) As Single Private Sub Command1_Click() x(1) = Val(Text1.Text) x(2) = Val(Text2.Text) Call Smallest(x()) End Sub (Continues on next page) CHAP. 8] ARRAYS
Private Sub Command2_Click() End End Sub Sub Smallest(x() As Single) Dim Text As String If (x(1) < x(2)) Then x(0) = x(1) Text = "a is smaller (a = " ElseIf (x(1) > x(2)) Then x(0) = x(2) Text = "b is smaller (b = " Else x(0) = x(1) Text = "Both values are equal (a, b = " End If Call Message(Text, x(0)) End Sub Sub Message(Text As String, Value As Single) Dim LineOut As String LineOut = Text & Str(Value) & ")" MsgBox LineOut End Sub Note that the entire array x is passed to the sub procedure Smallest from Command1_Click. Within Smallest, the smaller of the two values is determined and assigned to x(0). Finally, the value of x(0), together with an appropriate message, are passed to sub procedure Message. Within Message, the message and the value of x(0) are combined into a single string. This string is then displayed within a message box. When the program is executed, it behaves in exactly the same manner as the earlier program shown in Example 7.2. Fig.s 7.3 and 7.4 show representative output.
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