Difference Between Functions and Subs in VB.NET With Examples

Difference Between Functions and Subs in VB.NET With Examples

This tutorial will teach you about the Difference Between Functions and Subs in VB.NET With Examples.

A procedure is a method that performs a task when it’s called. There are two types of procedures in VB.Net and they are:

Functions – return a value

Sub procedures or Subs – do not return a value

What is a Function? The Function statement is composed of the name, parameter and the body of a function.

This is the syntax  in performing the Function statement:

[Modifiers] Function FunctionName [(ParameterList)] As ReturnType

Statements…….
End Function

Where,

Modifiers: it specifies the access level of the function and its values are:

Public, Private, Protected, Friend, Protected Friend, and information concerning overriding overloading shadowing and sharing.

FunctionName: point out the name of the function

parameter list: identifies the list of the parameters

ReturnType: identifies the data type of the variable the function returns

Example of Functions in VB.NET:

Step 1: Create a function called Compute. This function will simply compute the value provided by the user.

 Function Compute(ByVal input1 As Integer, ByVal input2 As Integer) As Integer

        Dim output As Integer

        output = input1 * input2

        Return output

    End Function

Step 2: Call the function and Provide values.

Dim ComputedOutput As Integer
'pass the return value from Function to ComputedOutput variable
ComputedOutput = Compute(20, 5)
'Display the result
MsgBox(ComputedOutput)

Sub in VB.NET

In Visual Basic, a Sub procedure is a series of statements composed by the Sub and End Sub statements. It performs a task that returns control to the calling code, but it does not return any value. it is also used to declare the name, parameter and the body of a subprocedure.

This is the syntax in declaring a parameter in the parameter list:

[Optional] [ByVal | ByRef] [ParamArray] parameter name As datatype

You can also visit this site for the advanced tutorial in the declaring parameter list. Click Here

This is syntax in performing a Sub statement:

[Modifiers] Sub SubName [(ParameterList)]

Statements…..

End Sub

Example:

Step 1: Create a Subroutine then add the code below:

Public Sub cArea(ByVal len As Double, ByVal wid As Double)
' Declare a variable.
Dim area As Double
If len = 0 Or wid = 0 Then
' If the argument = 0 then the Sub will exit immediately.
Exit Sub
End If
'It calculate area of rectangle.
area = len * wid
' Print the area to the message Box.
MsgBox(area)
End Sub

Step 2: Add a button and add the code below.

This code will call the subroutine.

 Private Sub BtnGetArea_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnGetArea.Click
        
cArea(20, 30)

 End Sub

Related article you may like.

Difference Between Conditional and Logical operators in VB.Net

Conclusion

In conclusion, the difference between functions and sub in vb.net is that functions return a value while the sub doesn’t return a value.

Inquiries

If you have any questions or suggestions about the difference between functions and sub using vb.net, please feel free to leave a comment below.