Function parameter

I want to make a Function who not all parameter are needed how can I do that ?

Example :

VB Code:

Private Function Calcu(x as Double, y as Double, z as Double) as Double
     Calcu = x + y + z
End Function

Like if I do not put z it will work... How can I do that ?

VB Code:

Option Explicit
 
Private Sub Command1_Click()
    MsgBox Calcu(1, 2)
End Sub
 
Private Function Calcu(x As Double, y As Double, Optional z As Double) As Double
     Calcu = x + y + z
End Function

As follows:

VB Code:

Function XYZ(X As This, Y As That, [COLOR=red]Optional[/COLOR] Z As Whatever)
    'Your Code
End Function

Thats it, you won't have to pass z if you don't want to.
Remember the following points in case of using Optional Parameters:

• The Paramebers following the first Optional Parameter must also be optional
• You can specify the default value of the Optional Parameter, if the user doesn't Pass any Value for that
• In case of a Variant Optional Parameter, you could check to see if it was specified using the IsMissing() Function
• In case you don't specify the Default Value of other DataTypes, it will be initialized as a standard Variable of that type: Inetegers will be Initialized to zero
• In case you need to use *any* number of Parameter which is unknown at the time you write the code, you can use the ParameterArray which would allow you to pass any number of parameters to a function.

Cheers

I think 50 words per minute is not good enough. I have to be faster.

:rolleyes:

Abu haider your explication was simply excellent!!! THX YOU man !!! :)

:cool:

The only one thing I do not understand is : In case you need to use *any* number of Parameter which is unknown at the time you write the code, you can use the ParameterArray which would allow you to pass any number of parameters to a function.

:confused:

If you dont know the datatype of the para

Yes but I do not know what to do in that case :(