Posts: 719
Threads: 72
Joined: Mar 2003
'GOSUB' goes to a line label, and 'CALL <subname> (param)' calls a declared subroutine/function
Code:
DECLARE SUB POScar()
CLS
'Call the subroutine:
CALL POScar
GOSUB POScar 'Will return an error
GOSUB label1
END
label1:
Print "This is a gosub sub"
RETURN 'return to where the code called this label
SUB POScar
PRINT "This is POScar sub"
END SUB
Got it? :bounce:
Oz~
Posts: 243
Threads: 12
Joined: Aug 2001
Good explanation, Oz
It may be a little advanced to also point out that GOSUB is often used to achieve simple modularity in code to avoid excessive indentation or to group some code with a common function.
Whereas SUB, properly used, is to make a module that can be separately debugged in another program. So all variable names within a SUB are either internal or else have to be SHARED or passed as parameters.
In this case, I was just moving the initialization code down so I could see the main logic: An ideal use of GOSUB but a big mistake to make it a SUB.
Mac
