Return more conventional

BackupUser · Post by **BackupUser** » Thu Jan 09, 2003 12:49 pm

Restored from previous forum. Originally posted by Manolo.

Hi Fred,

I think that Return will be more conventional with others Basic's:

Actual situation:

If a = 10
FakeReturn
Goto Main_Loop
Endif
Return

Conventional Return:

If a = 10
Return Main_Loop
Endif
Return

The FakeReturn in this case not is necesary (And in all cases).

Regards,

Manolo

BackupUser · Post by **BackupUser** » Thu Jan 09, 2003 8:19 pm

Restored from previous forum. Originally posted by Amiga5k.

If you ask me, exiting out of a subroutine with Goto is bad programming and should be strongly discouraged because errors can occur that are very hard to pin down. The example in the help file is a big no-no, imho:

Gosub SubRoutine1

SubRoutine1:
...
If a = 10
FakeReturn
Goto Main_Loop
Endif
Return

Although modern structured languages, such as Purebasic, can do without Goto altoghether, if you must use goto, only use it WITHIN the subroutine.

Take care,
Russell Jones

***I snatch kisses!***

BackupUser · Post by **BackupUser** » Thu Jan 09, 2003 9:40 pm

Restored from previous forum. Originally posted by PB.

> The example in the help file is a big no-no, imho

The example there is poor programming, yes; but the app it generates
is perfectly valid and won't cause any system problems (due to using
FakeReturn, that is).

BackupUser · Post by **BackupUser** » Thu Jan 09, 2003 9:51 pm

Restored from previous forum. Originally posted by Amiga5k.

So my question is: Why is FakeReturn even needed? I've never seen this command in other languages. Is it only needed for leaving a subroutine with Goto?

The only similar command I can think of is the 'Exit' command in PowerBasic:

For i = 1 to 100
If i = 50 then Exit For ' This will exit from the 'For/Next' loop
Print i
Next

...continued

A silly example, but you get the idea. An exit out of a function or subroutine without 'Return' will cause an error in PowerBasic and many other languages.

Russell Jones

***I snatch kisses!***

BackupUser · Post by **BackupUser** » Thu Jan 09, 2003 10:02 pm

Restored from previous forum. Originally posted by tranquil.

normaly I know this as Exit too. Or even Pop.

You have to use it if you leave a subroutine without a return so that the return-pointer is allways keeped on the stack.

hope you know what I mean with my ugly english

Mike

Tranquilizer/ Secretly!
http://www.secretly.de
Registred PureBasic User
System: Windows 2000 Server, 512 MB Ram, GeForce4200 TI 128 MB DDR, Hercules Theater 6.1 DTS Sound
System 2: Mobile Pentium 4 2.4GHz 512 MB DDR GeForce4 420-32, Windows XP Home

BackupUser · Post by **BackupUser** » Thu Jan 09, 2003 10:04 pm

Restored from previous forum. Originally posted by PB.

> Is [FakeReturn] only needed for leaving a subroutine with Goto?

Yes, so that if you choose to do that, you won't crash your app.

> An exit out of a function or subroutine without 'Return' will cause
> an error in PowerBasic and many other languages.

FEEL THE ...PURE... POWER!

BackupUser · Post by **BackupUser** » Thu Jan 09, 2003 10:08 pm

Restored from previous forum. Originally posted by PB.

> System: Windows 2000 Server, 512 MB Ram, GeForce4200 TI 128 MB DDR, Hercules Theater 6.1 DTS Sound

But a 486 CPU, right?

BackupUser · Post by **BackupUser** » Fri Jan 10, 2003 11:29 am

Restored from previous forum. Originally posted by TheBeck.

One could just use the pop asm instruction so fakereturn in not even necessary.

BackupUser · Post by **BackupUser** » Thu Jan 23, 2003 7:27 am

Restored from previous forum. Originally posted by koehler.

Hmm, what about pop_return ?

Actually, I to only remember pop being used.
However, as there are so many people who actually have never heard of it, I would prefer almost anything to fakereturn. I don't know why, but it just makes me itchy for some reason...

BackupUser · Post by **BackupUser** » Thu Jan 23, 2003 10:47 am

Restored from previous forum. Originally posted by TheBeck.

PopReturn sounds better to me too. This clearly describes what is happening, FakeReturn does not IMHO.