#584 COUNT in forloop doesn't work properly

[Manfred Zindel]

I'll try to simplify the problem:
I wrote to the commandline

MAKE "label "Hello 
MAKE "limit COUNT :label
for [position 1 :limit][PRINT ITEM :position :label]

and got the result

H
e
l
l
o

Then I replaced :limit by its definition COUNT :label and the project looked like

MAKE "label "Hello  
for [position 1 COUNT :label][PRINT ITEM :position :label]

and the result was in red:

not enough inputs to COUNT

So I tried:

MAKE "label "Hello  
for [position 1 (COUNT :label)][PRINT ITEM :position :label]

and was informed:

too many ('s

Now, my replacement of :limit by COUNT :label should have have worked, shouldn't it? Or is it not allowed to use expressions in the for loop? What is the logic behind it?

That's my question for today. (Maybe it has been discussed earlier somewhere.)

By the way: We (pbreport) had to solve a bunch of problems and to finish official projects during the last three months. Now we're returning to 'Little Helper' to get it pretty soon to a high level.. Other FMSLogo-projects will follow. Our targets are still the same.

[David Costanzo]

I didn't read what you wrote closely, but the documentation for FOR says this about the third member

A word or list that is evaluated to determine a number, the "limit value" of the variable.

Because you are using a list literal for the first input to FOR, you must use a list literal, not an expression for the lists within that list. Something like

MAKE "label "Hello
FOR [position 1 [COUNT :label]] [PRINT ITEM :position :label]
H
e
l
l
o

You can use an expression if you like, but then the entire first input must be evaluated before it is given to FOR.

MAKE "label "Hello
FOR (LIST "position 1 (COUNT :label)) [PRINT ITEM :position :label]
H
e
l
l
o

If you want to see the logic behind it, use SHOW:

SHOW ITEM 3 [position 1 COUNT :label]
COUNT

SHOW ITEM 3 [ position 1 (COUNT :label) ]
(COUNT