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and this question for the MSXBASIC geeks...... when i programmed in BASIC, i have the need to exit the bucle FOR/NEXT conditionaly BY example: FOR I=10 to 1 step -1 if STRIG(pl) then 2000 NEXT I now the question, this will increase the FOR/NEXT stack?

Yes it will...do that a couple of time and your MSX will hang up unless of course you do "I = 1:return" somewhere in the subroutine starting at 2000

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and this question for the MSXBASIC geeks...... when i programmed in BASIC, i have the need to exit the bucle FOR/NEXT conditionaly BY example: FOR I=10 to 1 step -1 if STRIG(pl) then 2000 NEXT I now the question, this will increase the FOR/NEXT stack? exists a safe way to exit from a bucle like that without increasing the FOR/NEXT stack?

Bad solution - before jumping out, set I to the max value and do NEXT:

100 FOR I=1 to 10
110 IF STRIG(0) THEN I=10: NEXT I: GOTO 200
120 NEXT I
130 END
200 ' Do the do

Better solution - avoid FOR/NEXT in this case:

100 I=1
110 IF STRIG(0) GOTO 200
120 I=I+1: IF I<11 GOTO 110
130 END
200 ' Do the dobedeedo

BTW: It's called a "loop", not a "bucle"

bucle could be a perfect typo of cycle when looking at the location of the keys

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and this question for the MSXBASIC geeks...... when i programmed in BASIC, i have the need to exit the bucle FOR/NEXT conditionaly BY example: FOR I=10 to 1 step -1 if STRIG(pl) then 2000 NEXT I now the question, this will increase the FOR/NEXT stack?

The solution is to do a NEXT which ends the loop before the GOTO... Change:

IF STRIG(pl) THEN GOTO 2000

--> into -->

IF STRIG(pl) THEN I=1 : NEXT : GOTO 2000

Of course, you can set I to any value beyond the FOR’s range, e.g. 0, -1 or -999 would do as well in this case.

(sidenote: in the case of IF STRIG(pl) THEN 2000, if you change it into IF STRIG(pl) GOTO 2000 it will do the same, but will be slightly faster!)


~Grauw

Ack, Aurora already posted this solution -_-;;...

I wouldn’t call it a ‘bad’ solution though, you’re using a loop for a loop, and that’s perfectly alright. Breaking out of a loop is common practice in many other languages (break in C-style languages), and it is perfectly acceptable...


~Grauw

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Ack, Aurora already posted this solution -_-;;...

And D-Tail is getting the credit for it on your BASIC tips page (map.tni.nl/articles/basic_tips_tricks.php)!

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Breaking out of a loop is common practice in many other languages (break in C-style languages), and it is perfectly acceptable...

The difference is that C provides a means (break) to break out of the loop. In MSX-BASIC you're using a trick. That's what makes it a less attractive solution, in my view.

[edit]How does that b****y URL BBtag work, dammit?[/edit]

[url=http://www.msx.org/]MSX Resource Center[/url]

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[url=http://www.msx.org/]MSX Resource Center[/url]

Thanx Would it be possible to have exactly that text as hint below the message edit box, in the section that explains the BBCode tags?