Help with error please

When I run a debug on a script in LSLEditor or try running it in OSSL (the open sim version of LSL) I get the following error message

* CS0201: Only assignment, call, increment, decrement, and new object expressions can be used as a statement

When I look up that error message i find the explanation:

This error is produced by a number of sources.
1. If you call an object that requires parentheses () after the command, you'll get this error. Ex. database.Open() not database.Open
2. Using an assignment operator as opposes to an equality operator

The line it blames is:

for(x;x<num;x++)

I'm just not seeing the problem, anyone spot it? For clarity, it's part of a sensor, so
in context:

sensor(integer num)
     {
        if(num > 11)num = 11;
        text = "";
        many = 1;
        pos = llGetPos();
        integer x=0;
        for(x;x<num;x++)
        {
            extra = [];
            sub = llDetectedKey(x);
            if(sub != owner)
            {
                info = llGetAgentInfo(sub);
//blah more code blah

How about: for(x=0;x < num;x++)

...does that fix the problem?

that's probably it.

you really should get in the habit of spacing you code (esp. math) if only to prevent SL's idiot compiler from reading (1-1) as (1 -1) instead of (1 - 1), plus it makes it easier to read later

Yes that was it alright , thank you very much fellows