please answer this question

[XMortal]

I know they are the fundamental parts of a program and this is gunna sound rather stupid, but can someone explain subs and functions and the private keyword

i dont understand how they are used

please answer

[DiGiTaIErRoR]

A sub does functions but you can't input objects when in use i.e.

Public Sub Stuff()
Text1.Text = "Some stuff."
End Sub

with functions:

Public Function Stuff(TxtBox As TextBox, Txt As String)
TxtBox.Text = Txt
End Function

then in a command button put:

Stuff Text1, "Some Stuff."

here it takes Text1.Text = "Some Stuff."
Private is for the Dimmed object or sub/function etc. so it can only be used by that module/form etc.
Public is the oppisite.


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DiGiTaIErRoR
VB, QBasic, Iptscrae, HTML
Quote: There are no stupid questions, just stupid people.

[Buzby]

Subs and Functions are pretty similar - the main difference being a function can return information.

For example;

Sub MySub(InputStuff as String)
.. process InputStuff in some way...
End Sub

This would be called by;

MySub [inputstuff]


A function example;.
Function MyFunc(InputStuff as String) As String
.. process InputStuff in some way...
MyFunc=[returned information]
End Function

In code;

Dim Returned as String
Returned=MyFunc([input stuff])


Use the Private keyword before either a sub or a function to keep it 'private' to the module or form - ie, you cannot 'see' it or run it from another form or module.


Example; To centre a form (note that we don't need any returned information so we use a sub)

Sub CentreWindow(ThisForm as Form)
ThisForm.Left=(screen.width-thisform.width)/2
thisform.top=(Screen.height-thisform.height)/2
End Sub

So, if you wanted to centre a form you could then call it like this;

CentreWindow [form name]

Example 2; To return the version number of the program (we need a returned value so we use a function) However, we don't need to send any information (Arguments) to the function.

Function GetVer() As String
GetVer = App.Major & "." & App.Minor & "." & App.Revision
End Function

In the code I might use it;

lblVersion.Caption = GetVer


Hope this helps.


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Mark "Buzby" Beeton
VB Developer
[email protected]

[Maartin]

Very good explanation Buzby.

Only one thing i think the last bit should read.
Example; To centre a form (note that we don't need any returned information so we use a sub).

Public Sub CentreWindow(ThisForm as Form)
ThisForm.Left=(screen.width- thisform.width)/2
Thisform.top=(Screen.height-thisform.height)/2
End Sub

So, if you wanted to centre a form you could then call it like this (in Private or Public use);

CentreWindow [form name]

Example 2; To return the version number of the program (we need a returned value so we use a function) However, we don't need to send any information (Arguments) to the function.

Function GetVer() As String
GetVer = App.Major & "." & App.Minor & "." & App.Revision
End Function

In the code I might use it;

lblVersion.Caption = GetVer


[This message has been edited by Maartin (edited 02-03-2000).]

[Buzby]

In the module they come from they are both Public but I was just demonstrating the use of Sub and Function and removed the Public bit to avoid confusion.

Thanks for the compliment anyway!!



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Mark "Buzby" Beeton
VB Developer
[email protected]