Help with Maxim Ibutton "IF THEN ELSE" statements please

[HenrikOlsson]

Hi,
Since your IF-THEN statements are actually GOTOs (if evaluated true) all you need to do is add GOSUB (or GOTO) WRONG after the three IF statements.

IF Serial[1]=$15 AND Serial[2]=$D3 AND Serial[3]=$7D AND Serial[4]=$16 AND Serial[5]=$00 AND Serial[6]=$00 THEN correct1    '<----This will GOTO correct1
IF Serial[1]=$68 AND Serial[2]=$36 AND Serial[3]=$4F AND Serial[4]=$17 AND Serial[5]=$00 AND Serial[6]=$00 THEN correct2
IF Serial[1]=$1E AND Serial[2]=$1A AND Serial[3]=$2C AND Serial[4]=$17 AND Serial[5]=$00 AND Serial[6]=$00 THEN correct3
GOSUB WRONG
GOTO mainloop

Now the WRONG subroutine will only execute if none of the three IF statements evalutate true.

/Henrik.

[andybarrett1]

Henrik

You mean :-

Now the WRONG subroutine will only execute if none of the three IF statements evalutate FALSE.

Not near the units so cant try at moment !

Thank you for reading

[EarlyBird2]

Henrik

You mean :-

Now the WRONG subroutine will only execute if none of the three IF statements evalutate FALSE.

Not near the units so cant try at moment !

Thank you for reading

No he means:-

Now the WRONG subroutine will only execute if ALL of the three IF statements evalutate FALSE.

[andybarrett1]

No he means:-

Now the WRONG subroutine will only execute if ALL of the three IF statements evalutate FALSE.

So its like a :-

IF NOT THEN

Sorry for being so dim.....Thank you for help !

[EarlyBird2]

Not what was meant.

All you need to do is change this

else gosub wrong
endif

to this

gosub wrong

in your code

[HenrikOlsson]

Hi,

Now the WRONG subroutine will only execute if none of the three IF statements evalutate FALSE

No, as have been said. If the first condition evalutes TRUE the execution will GOTO correct1 and therefor bypass the GOSUB WRONG statement. Same thing if the second or third condition evalutes TRUE. However, if none of the three conditions evalutes true the GOSUB WRONG will execute. Remember that the way you have your IF statment written it'll issue a GOTO, not GOSUB so make sure that your correct1, 2, 3 routines does not end with a RETURN.

That is neat! Although I do not like using goto statements as they can make the program logic difficult to follow.

I totally agree, GOTOs can lead to some real mess but sometimes it's the easy way.....and there's almost always more than one way to do what one wants.

/Henrik.

[EarlyBird2]

In Scunthorpe to see the BOS plant?

I am amazed but thinking about it I can not think of any other reason to come here.

Hope you did not travel far!

[andybarrett1]

Will play about with it later...

Am understanding more now

Thank you

[EarlyBird2]

Henrik,

That is neat! Although I do not like using goto statements as they can make the program logic difficult to follow.