Android Question Fisher - Yates Shuffle


Licensed User
Longtime User
i make button with random number no repeat, but get error
it's my code

Sub Globals
'These global variables will be redeclared each time the activity is created.
'These variables can only be accessed from this module.
Dim btn(8) As Button
Dim i, k, x,j As Int
End Sub

Sub Activity_Create(FirstTime As Boolean)
'Do not forget to load the layout file created with the visual designer. For example:

For i = 0 To 7
Activity.AddView(btn(i),5%x,15dip + i*75,80%x,60dip)
btn(i).Text = i
For j = 0 To 7
k = Rnd(j, 7) 'error in this section
x = btn(j).Text
btn(j).Text = btn(k).Text
btn(k).Text = x

End Sub

please help, thank you


Well-Known Member
Licensed User
Longtime User
I see what you are trying to do and your thought process but it is wrong. As Erel has pointed out, there will be occasions when the random function will be Rnd(7,7) which is probably the reason for your error. But even if you change the Max random value to 8 it still won't give you the result your looking for. You are just limiting the randomness of your values with each iteration.
The way I personally prefer to do this type of thing is to add all the values you need to a list then randomly remove from the list. That way you get a random order and it's impossible to get duplicates unless of course you add duplicates to the list. ;)
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