Can some one Help.........What is the different in these two code routine

sam_sam_sam

Hi, Everyone

I have a question what is the different about the way these two
codes work

I notice that they do not work the same
they seem·to say the same thing but one has ENDIF dose this a·make different in the
way it is compile·

Can some one explane what the different is·and when to use one over the other

Thanks to any one that can explane this to me

IF hrs = $00·AND mins = $05 AND secs = $00 THEN EXIT
LOW 15


················································· VS



IF hrs = $00·AND mins = $05 AND secs = $00 THEN
·EXIT
LOW 15
ENDIF

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··Thanks for any··that you may have and all of your time finding them

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Sam

Post Edited (sam_sam_sam) : 12/17/2007 8:07:27 PM GMT

Mike Green

Functionally, these should work the same. Probably the 2nd format gets translated into something like:

IF NOT(hrs = $00 AND mins = $05 AND secs = $00) THEN GOTO skipIt
   EXIT
skipIt:
LOW 15

Tracy Allen

EXIT can only be used inside a DO or FOR loop. Do you have a stripped down example of where the two forms give different results? I think they should be identical.

This code:

FOR mins=0 TO 9
IF (hrs = $00 AND mins = $05 AND secs = $00) THEN EXIT
LOW 15
NEXT
 ' continue here on EXIT or NEXT fallthrough

would translate to something like this in internal PBASIC:

FOR mins=0 TO 9
IF (hrs = $00 AND mins = $05 AND secs = $00) THEN GOTO label1
GOTO label2
label1: GOTO label3  ' this is the EXIT
label2:  LOW 15
NEXT
label3:   ' continue here on EXIT or NEXT fallthrough

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Tracy Allen
www.emesystems.com

Andy Fox

Actually, the difference is that the LOW 15 in the first code piece will *always* be executed, while the LOW 15 in the second code piece will only be executed when the IF...THEN statement is true.

sam_sam_sam

Mike Green

Functionally, these should work the same

Thanks You for your reply

I thought that should work the same

I found out that they do not work same

In this example·I am NOT RESETTING THE TIME TO $00 AND $00 for mins and secs

I want to pick up where it left off when the power was LOSS so if the routine is done that stay done when the power come back on meaning that the LED should be OFF

Here is an example

IF secs > $05 THEN
HIGH··LED
ENDIF

IF mins = $03 AND secs = $15 THEN
EXIT
LOW LED
ENDIF

The·LED would BLINK once and then be··OFF Which is what i want it to do

If i could get this to where it would not BLINK at all it would be better but if not then i can live with this

·If you power OFF the basic Stamp power ON agian after the 3 mins and 15 secs had past


IF secs > $05 THEN
HIGH··LED
ENDIF
·
IF mins = $03 AND secs = $15 THEN EXIT
LOW LED

·If you power OFF the basic Stamp power ON agian after the 3 mins and 15 secs had past

Now with·this one when you power down the Basic Stamp
The Led would STAY ON all the time This·is not what·is wanted in this case

Now i would like understand why this seem to make a different·

I have seen this before that it make a different where you put command next to THEN or on the next line and using ENDIF


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··Thanks for any··that you may have and all of your time finding them

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Sam

sam_sam_sam

Tracy Allen
Thank you for your reply here are both examples

·One works the way i want it to work the other

One dose not

·I like to understand what is different


Let me clear some thing UP these two routine work fine the way i want them to work they both turn the Led off As long you do not power down the Basic Stamp

The Problem is when you·POWER the Basic Stamp DOWN after· 3 mins and 15 secs have past·and POWER It back UP is where the different thing are happing

·I would like to understand why they work different

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··Thanks for any··that you may have and all of your time finding them

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Sam

Post Edited (sam_sam_sam) : 12/17/2007 10:10:27 PM GMT

Franklin

As I understand the if statement, if you put the action at the end of the line the interpreter considers it a one line if. the next line is NOT part of the if.
If you end the line with then the next lines are part of the if until you get to an endif.
the first version does not require an endif while the second does.

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- Stephen