For all functions calls Random(n,n) I get n for the return value,
except for n=0 where I get numbers > 0. A bug? Using EWB 2.06B15.

Michael Dreher

Michael Dreher wrote:

> For all functions calls Random(n,n) I get n for the return value,
> except for n=0 where I get numbers > 0. A bug?

Reading the spec, it is as expected. The second param of 0 means between 0 and MaxInt.

--

Matthew Jones

"Matthew Jones" wrote:

   // Reading the spec, it is as expected. The second param of 0 means between 0 and MaxInt.

The help declares

function Random(AFrom: Integer=0; ATo=<MaxInt>): Integer

which means that the 2'nd parameter defaults to MaxInt when
it's not provided and not when the 2'nd parameter is provided
and of value 0.

Michael Dreher

Michael Dreher wrote:

> The help declares

I am indeed very wrong. Apologies. What is interesting though is that my code has quite a few calls to Random like:
'RND' + IntToStr(Ceil(Random * 255)) + '-' + IntToStr(Ceil(Random * 255));

Obviously it has multiple modes - and the JavaScript Random is a float returning a number between zero and 1.

But the fact that the one you are using is internal means we can't see what is happening.

I have to ask though, what are you really expecting to get? Presumably just zero? And what are you actually getting - what range is returned?

--

Matthew Jones

"Matthew Jones" wrote:

  //  I have to ask though, what are you really expecting to get?
  //  Presumably just zero? And what are you actually getting - what range is returned?

Yes zero of course. My application is indexing an array randomly

 if stringList.Count() > 0 then
      stringList[Random(0, stringList.Count() - 1)]  := '..';

which results in "List index 54653645345 out out of bounds" (the high
number differ each run), when stringList.Count() = 1, which means Random(0,0).

Michael Dreher

On 12/4/2018 5:39 AM, Michael Dreher wrote:
> which means that the 2'nd parameter defaults to MaxInt when
> it's not provided and not when the 2'nd parameter is provided
> and of value 0.

If step with debugger into random then yes second param is checked for 0
and only then defaulted to maxint (or 9007199254740991).

Tim would need to take a look at this one

Raul

Michael,

<< For all functions calls Random(n,n) I get n for the return value, except for n=0 where I get numbers > 0. A bug? Using EWB 2.06B15. >>

I've fixed this for 2.06 B19.

Tim Young
Elevate Software
www.elevatesoft.com