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Visual Basic stores code in 3 kinds of modules: describe each one of them using examples toillustrate

Question

Visual Basic stores code in 3 kinds of modules: describe each one of them using examples to illustrate

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Solution

Sure! In Visual Basic, code is stored in three types of modules: standard modules, class modules, and form modules.

  1. Standard Modules:

    • Standard modules are used to store general-purpose code that can be accessed from anywhere in the project.

    • They are typically used to define global variables, constants, and functions that are used throughout the application.

    • Here's an example of a standard module in Visual Basic:

      Module MyModule
          Public Const PI As Double = 3.14159
      
          Public Function CalculateArea(radius As Double) As Double
              Return PI * radius * radius
          End Function
      End Module
      
    • In this example, the standard module "MyModule" defines a constant "PI" and a function "CalculateArea" that calculates the area of a circle.

  2. Class Modules:

    • Class modules are used to define custom objects with their own properties, methods, and events.

    • They encapsulate related code and data into a single unit, making it easier to manage and reuse.

    • Here's an example of a class module in Visual Basic:

      Public Class Employee
          Public Property Name As String
          Public Property Age As Integer
      
          Public Sub New(name As String, age As Integer)
              Me.Name = name
              Me.Age = age
          End Sub
      
          Public Sub DisplayInfo()
              Console.WriteLine("Name: " & Name)
              Console.WriteLine("Age: " & Age)
          End Sub
      End Class
      
    • In this example, the class module "Employee" defines properties for name and age, a constructor to initialize the object, and a method to display the employee's information.

  3. Form Modules:

    • Form modules are used to define the behavior and appearance of a user interface form.

    • They contain event handlers, controls, and code that interact with the user and perform actions based on user input.

    • Here's an example of a form module in Visual Basic:

      Public Class MainForm
          Private Sub btnSubmit_Click(sender As Object, e As EventArgs) Handles btnSubmit.Click
              Dim name As String = txtName.Text
              Dim age As Integer = CInt(txtAge.Text)
      
              Dim employee As New Employee(name, age)
              employee.DisplayInfo()
          End Sub
      End Class
      
    • In this example, the form module "MainForm" contains a button click event handler that retrieves the values entered in text boxes, creates an instance of the "Employee" class, and displays the employee's information.

These three types of modules in Visual Basic provide different ways to organize and structure code based on its purpose and functionality.

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