Code does not compile to execute. How to make a cycle?

Question

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According to the documentation, the loop is done like this

var a = 1; var b = 10; while (b != 0) { b = b - 1; a = a+1; }; return a;

For me it looks like this

var posts=API.newsfeed.search({"q":"Test"});
var [email protected]_id;
var i=0;
var gIds=[];
var uIds=[];
while(i<ownerIds.length)
{
  if(ownerIds[i]<0)
  {
    gIds.push(ownerIds[i]);    
  };
  i=i+1;
};
return gIds;

This code returns an error

"error_code":12,"error_msg":"Unable to compile code:  ';' expected

Empirically established that the problem is in the line i=i+1;
If this line is removed and the while is slightly rewritten without comparing with i, then it compiles and returns a normal result.
And I also tried to run the example from the docks. It falls off on the line b = b - 1;
The call code itself in C#, if that matters

using (var client = new HttpClient())
{
    client.DefaultRequestHeaders.Accept.Clear();

    var res = client.GetAsync($"https://api.vk.com/method/execute?code={queryParam}&access_token={token}&v=5.62").Result;
    var answer = res.Content.ReadAsStringAsync().Result;
}

Where is my error? Already spent a lot of time.
PS:
Posted a question. I tried the code on the docks page in vk and it worked. And then it dawned on me that it was the '+'. Get request accepts it as a space. But the problem persisted even after I made Urlencode. On the vk side, he still does not see this plus and goes into an eternal loop.
Help with advice on how to solve this)

Answer 1

In general, I made a request via POST and everything is fine. It was not possible to send +/- through GET, even encoding, vk returns an error.