n Data and Object Structures in Visual Basic .NET

Maker Quick Response Code in Visual Basic .NET n Data and Object Structures
6 n Data and Object Structures
QR Code JIS X 0510 Generation In VB.NET
Using Barcode printer for .NET framework Control to generate, create QR image in .NET framework applications.
'will indicate that 'obj' is less if either its 'value is less or it is null If obj Is Nothing OrElse mvarMark < objmark Then Return -1 ElseIf mvarMark = objMark Then Return 0 Else Return +1 End If End Function End Class Listing 611: A Student class we can create arrays of (note the CompareTo() method)
Generating Bar Code In Visual Basic .NET
Using Barcode creator for VS .NET Control to generate, create bar code image in .NET applications.
We can now go on to write a simple array declaration to de ne a group of students It is a good idea to try to apply some order to the declaration since this will save some work later The array itself is the only declaration we really need, but it is useful to keep track of how much of it is in use Initially, the array as declared will have elements numbered 0 to GetUpperBound(0) However, none of these elements will contain data when the array is initially declared We can keep track of how many elements have been lled using a simple Integer variable:
Printing QR Code In C#
Using Barcode creation for VS .NET Control to generate, create QR-Code image in .NET applications.
Private StudentList(10) As Student Private ClassSize As Integer = 0
Print QR Code In .NET Framework
Using Barcode creator for ASP.NET Control to generate, create QR-Code image in ASP.NET applications.
Note that by initializing ClassSize to 0, we have an indication that there are currently no assigned elements in the array Now, to assign a new element, we can go through the following steps (assume <Name> is a variable containing the new entry s name, and <Mark> the corresponding mark, in code like Listing 612):
QR Code JIS X 0510 Maker In VS .NET
Using Barcode maker for Visual Studio .NET Control to generate, create QR Code JIS X 0510 image in VS .NET applications.
'Check there is space in the array If ClassSize < StudentListGetUpperBound(0) Then 'Assign a student to element number ClassSize StudentList(ClassSize) = New Student(<Name>, <Mark>) 'Now increment ClassSize to indicate the new entry ClassSize += 1 End If Listing 612: Adding a new student to the StudentList array
Barcode Encoder In VB.NET
Using Barcode creator for .NET Control to generate, create bar code image in .NET applications.
When we want to do something with each element of the StudentList array, we can use a simple ForNext loop:
Encoding Bar Code In VB.NET
Using Barcode generation for .NET Control to generate, create bar code image in .NET applications.
For index = 0 To ClassSize 1 StudentList(index)Report() Next
Creating Code 3/9 In VB.NET
Using Barcode drawer for VS .NET Control to generate, create Code-39 image in Visual Studio .NET applications.
or for an array that we know to be full
Generating USS Code 128 In Visual Basic .NET
Using Barcode generation for Visual Studio .NET Control to generate, create ANSI/AIM Code 128 image in VS .NET applications.
62 Arrays
Encoding ECC200 In VB.NET
Using Barcode creation for .NET framework Control to generate, create Data Matrix image in .NET applications.
For index = 0 To StudentListGetUpperBound(0) StudentList(index)Report() Next Listing 613: Iterating through the array two ways of getting the upper limit
Make EAN / UCC - 14 In .NET Framework
Using Barcode creator for ASP.NET Control to generate, create UCC-128 image in ASP.NET applications.
Listing 613 illustrates both methods Note that we need to make sure not to access element number ClassSize, since this has not been allocated yet Either of the above For loops will iterate from the rst occupied element of the array to the last Having declared an array of Student object variables and populated at least some of them with Student objects, we can start to do meaningful operations on them: for example, nding out the average class test mark (Listing 614), or the students with the highest and lowest marks (Listing 615)
Generate EAN / UCC - 13 In .NET Framework
Using Barcode generation for .NET Control to generate, create EAN / UCC - 14 image in .NET applications.
'Let's now try to work out a few things about the group 'First the average mark Dim index As Integer Dim total As Integer = 0 For index = 0 To ClassSize 1 total += StudentList(index)Mark Next ConsoleWriteLine ("Average mark is {0}", _ total / ClassSize) Listing 614: Calculating the average mark
Making UPC Code In VS .NET
Using Barcode creation for ASP.NET Control to generate, create UPC Code image in ASP.NET applications.
To get the average mark, we use the same method as we would to calculate an average of anything add all the marks together and then divide the overall sum by the number of values To nd the students with the maximum mark, guess on some entry as having the maximum mark (usually the rst element in the array), and then scan through the rest of the array correcting our guess any time we meet a higher mark The same technique works for nding the student with the lowest mark, and since the algorithm is nearly the same, we can combine both operations within a single ForNext loop
Barcode Creator In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create barcode image in ASP.NET applications.
'Find the best and worst students Dim min As Integer = 0, max As Integer = 0 'We've started by guessing that StudentList(0) has both the 'highest and the lowest test mark Now scan through the 'array finding the real highest and lowest For index = 1 To ClassSize 1 If StudentList(index)Mark < StudentList(min)Mark Then 'Found a student with a lower mark min = index End If If StudentList(index)Mark > StudentList(max)Mark Then 'Found a student with a higher mark max = index End If
Code 128C Printer In Java
Using Barcode encoder for Java Control to generate, create USS Code 128 image in Java applications.
Painting EAN-13 In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create GTIN - 13 image in ASP.NET applications.
Making Barcode In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create bar code image in ASP.NET applications.
Encode EAN13 In Java
Using Barcode generation for Java Control to generate, create EAN / UCC - 13 image in Java applications.