Main program calls subs

Keywords:

Subroutine

Situation:

You have a relatively complex program. It's too big to think about all at once.

Actions:

Break the program into subs. The main program coordinates passing data between the subs.

Explanation:

An example:

Private Sub cmdRun_Click()
Dim quality As String
Dim size As String
Dim region As String
Dim price As Single
'Input
getInput quality, size, region
'Processing
computePrice quality, size, region, price
'Output
output price
End Sub
'Input
Sub getInput(quality As String, size As String, region As String)
...
End Sub
'Processing
Sub computePrice(quality As String, size As String, region As String, price As Single)
...
End Sub
'Output
Sub output(price As Single)
...
End Sub

The main program coordinates the subs. getInput fills quality, size, and region. The main program sends those values to computePrice, which fills price, and so on.

You can write and debug getInput without thinking about the rest of the program. This reduces screaming.

Referenced in:

Better thunking