adding numbers with OOP

[ThePentiumGuy]

i have a class called add with a function called number

publc function number(byval mynumber as integr)

mynumber +=1

end function

 

in my main program(globals):

dim add as new add

dim x as integer = 3

(button1.click)

add.number(x)

Messagebox.sjow(x)

 

but its always 3? how come?

[mutant]

If you want to do it like this you have to pass the number to function as reference, which will keep oparating on the variable that you passed in itself instead of just getting the value of it and using it:

public Sub number(ByRef mynumber As Integer) 'ByRef instead of ByVal

Or if you want to pass it by value then you have to do this:

public function number(byval mynumber as integer) As Integer
mynumber +=1
Return mynumber
end function
'and then assign the result to the number
x = add.number(x)
Messagebox.Show(x)

Edited August 2, 2003 by mutant

[ThePentiumGuy]

ahh i see, thanks(the first method seems easier)

but on the sencond method could u do this:

Public Function number(ByVal mynumber As Integer) As Integer
mynumber+=1
return mynumber 'this doesnt work
End Function

x = add.number(x)
Messagebox.Show(x)

but anyway, thanks. im new to OOP and ive found out that its helpful :) Really helpful

[Volte]

Public Shared Function number(ByVal n as Integer) As Integer
 Return n + 1
End Function

' You don't need to declare an instance first since I made the function "Shared".
x = Add.Number(x)
MessageBox.Show(x)

I don't think changing a ByVal parameter has any effect.