If-then and Gosub

Archiver

I feel kind of stupid for having to ask this but, why can't I use a gosub
command in an "If, then" statement?



i.e., If x=10 then gosub blahblah

I have a series of "if then" statements in my main code loop and would like
to return to the next instruction. My work around is that I have labels for
every instruction. Gosub would certainly seem to be cleaner.

Thanks for any advise.

Jeff

Archiver

This is just how PBasic works. There is an implied GOTO after the THEN. Here
are a few ideas to work around it:

1) The obvious

IF x=10 THEN call_blah
blah_ret:
yadda yadda


call_blah:
gosub blah
goto blah_ret


2) The subtle

IF x<>10 THEN nocall_blah
gosub blah
nocall_blah:


Another related trick is to use a label called RET in front of some RETURN
statement in your program (doesn't really matter which RETURN). That way in
a subroutine you can write:

asub:
whatever
yadda yadda
IF x=33 THEN RET ' return if X=33
blah blah

ret:
RETURN


Al Williams
AWC
* Easy RS232 prototyping
http://www.al-williams.com/awce/rs1.htm



>

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Original Message

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> From: Jeff Mitchell [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=r__5h6YbHx7Q7zsTOkkvFJ72pHa_5-2k_iwRgvbhabbZPLYsSMaP7rsnWTZ2MpSlM0cPeCHo4ySwFHlb]EL-JEFE@P...[/url
> Sent: Wednesday, August 15, 2001 11:17 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] If-then and Gosub
>
>
> I feel kind of stupid for having to ask this but, why can't I use a gosub
> command in an "If, then" statement?
>
>
>
> i.e., If x=10 then gosub blahblah
>
> I have a series of "if then" statements in my main code loop and
> would like
> to return to the next instruction. My work around is that I have
> labels for
> every instruction. Gosub would certainly seem to be cleaner.
>
> Thanks for any advise.
>
> Jeff
>
>
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