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//inc $null %a
why it doesn't work? it should evaluate $null to nothing and make it //inc %a but it gives error

/inc doesn't evaluate the first parameter I think.

it does..
//inc $(%a,0)

Bah, lol. Maybe it simply delays evaluation then.

%a = 1
/alias %a <-- will evaluate %a to 1 and perform /alias 1
/inc %a <-- will not evaluate %a to 1 (so it doesn't try to increase 1), but will evaluate it later, so $(%a,0) becomes %a, and $null is nothing and so mIRC decides you didn't give a first parameter and echoes "insufficient parameters".

If that isn't right then I give up..

inc $(-u1) %a
won't evaluate %a becuz it evaluate identifiers first and then /inc the variable (if it's in the right place in the command)
so it's the same in //inc $null %a but doesn't work there

If it delayed the evaluation of all the parameters (rather than just the first) then it would still fit in. When it evaluated the first parameter to a switch it would simply take the second parameter as the variable to increase. If you give it any null value as a first parameter* it must check to see if the first parameter* or not, and if it doesn't it just says "insufficient parameters", without checking for another parameter.

*or second parameter with a switch.

$null is not a variable, it is an identifier, and a empty one at that. You can not manipulate the value of an identifier like you can a variable. Identifiers usually get defined by events, like $nick and $chan. $null is a pre-defined value that you can not manipulate. Try using %null instead of $null.

$null is exactly what i want, to make it 'nothing'

so, you want inc $null %a, to do exactly the same as inc %a, why be so awkward :tongue:?

Dude, the line "inc $null %a" had you read the helpfile for /inc would mean you want to increase the specified variable (first argument, in your case $null) with the specified value (second argument, in your case %a).

Now if you wanna make a variable have no value, then you cannot /inc it, as incc means "increment the value of" - again you could have gotten that from the helpfile -. If you wanna make a variable have no value, use /unset %varname. There is no factual difference between a variable that has no value and one that doesn't exist unless you start doing incredibly weird stuff.

u probably don't understand what i want, collective does
what i want to do is to /inc %var , my question was why it doesn't work when i put $null before the %var ($null should evaluated first). the $null was just an example, it can be:
inc $iif(!%a,-u4) %a
here, when the $iif will return $null it won't work.
i can do % $+ a at the end but i don't understand why %a doesn't work.

..like mentioned above: the syntax just doesnt allows to handle switches like that..
..if you want to set the -u4timer each time you increase the var just do:
$iif(!%a,inc -u4 %a)
..else, if you want the var to be set for 4 seconds and only beeing increased during the 4 seconds:
$iif(!%a,set -u4 %a,inc %a)
.