[fpc-pascal] type conversions

[Jonas Maebe]

On maandag, dec 9, 2002, at 13:04 Europe/Brussels, 
Michael.VanCanneyt at wisa.be wrote:

>> TList.count returns -1, this is converted to a 16 bit unsigned value =
>> 65535 -> the loop is run from 0 to 65535 (and crashes in the first
>> iteration).
>
> How can TList.count return a -1 ? Normally, this cannot happen.

Well, the expression was:

var
   i: tunsigned16; { or something like that }

begin
   for i := 0 to (tlist_var.count - 1) do
     ...

So count returned 0, then 1 was sibstracted and the result was 
converted to a word...


Jonas