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Hans

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Joined: 18/10/2022
Location: Canada
Posts: 116

Posted: 09:55pm 15 Jun 2023

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Hi all;

What am I missing about the GOSUB command?

I get this weird error "Error : Invalid character:" when I use GOSUB Test, but if I just use the word test and leave out GOSUB, it executes the subroutine correctly????

I have supplied an example in its simplest form.

Details;

The program;

Error;

I don't understand how the GOSUB command is supposed to be used or why it works this way.

TIA

Hans ...

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 6798

Posted: 10:01pm 15 Jun 2023

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GOSUB doesn't call a SUB.

'My test

GOSUB routine

treaacle

END

routine:
Print "This is a routine called by GOSUB"
RETURN

SUB treacle
print "This is treacle"
END SUB

It's a bit misleading. GOSUB was short for GO SUBROUTINE originally. It's long in the tooth now but still has the occasional use for calling labels.
Edited 2023-06-16 08:03 by Mixtel90

Mick

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TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6100

Posted: 10:02pm 15 Jun 2023

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GOSUB is the old way of calling subroutines

Quote ' my test

test

END

SUB test
PRINT "hello"

END SUB

The manual has a good description of calling SUBs and FUNCTIONs

Jim

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JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 3804

Posted: 10:33pm 15 Jun 2023

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I think GOSUB would work with a label (or line number) rather than a SUB name.

New programs just don't need GOSUB.

John

Hans

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Joined: 18/10/2022
Location: Canada
Posts: 116

Posted: 10:44pm 15 Jun 2023

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Thank you Jim and Mick!

IMHO it's not very "basic".

Now all I have to do is cleanup the giant pile of hair next to my desk.

Again thanks;

Hans ...

lizby
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Joined: 17/05/2016
Location: United States
Posts: 3150

Posted: 11:21pm 15 Jun 2023

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GOSUB is old school and should generally not be used for new code. It is useful to allow older programs which use it to continue to run.

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toml_12953
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Joined: 13/02/2015
Location: United States
Posts: 339

Posted: 02:28am 16 Jun 2023

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Hans said Thank you Jim and Mick!

IMHO it's not very "basic".

Now all I have to do is cleanup the giant pile of hair next to my desk.

Again thanks;

Hans ...

For the first thirty years or so of BASIC's life, programs had to have line numbers. There were no alphanumeric labels. GOSUB nnnn...RETURN (where nnnn is a line number) was the only way to perform a subroutine. There was no CALL...SUB pair. It wasn't until the ANSI X3 committee tried to update BASIC that newer constructs such as DO...LOOP, multiline IF...THEN...ELSE...END IF, FUNCTIONS and SUBs were made a part of the official language.

Pilot352
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Joined: 12/08/2020
Location: United States
Posts: 34

Posted: 11:30am 16 Jun 2023

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** POST REMOVED BY AUTHOR **
Edited 2023-06-16 21:34 by Pilot352

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