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Topic: Bug in Left() function (Read 2202 times)
PsaCrypt
New Member
Posts: 21
Bug in Left() function
«
on:
May 19, 2018, 03:34:04 pm »
Hello, tracing a new error converting from my sourcecode I found this:
showmessage(left('-255R', 1));
It returns '2', but must return '-'.
:-(
Logged
bigeno
Sr. Member
Posts: 266
Re: Bug in Left() function
«
Reply #1 on:
May 19, 2018, 03:39:03 pm »
Where is left function ? you should use LeftStr maybe ?
Logged
Handoko
Hero Member
Posts: 5131
My goal: build my own game engine using Lazarus
Re: Bug in Left() function
«
Reply #2 on:
May 19, 2018, 03:54:31 pm »
I got compile time error (syntax) if I do this:
Code: Pascal
[Select]
[+]
[-]
procedure
TForm1
.
Button1Click
(
Sender
:
TObject
)
;
begin
showmessage
(
left
(
'-255R'
,
1
)
)
;
end
;
It happens because Left is a property of TControl.
Instead, I got correct result if I use
LeftStr
.
Logged
Thaddy
Hero Member
Posts: 14213
Probably until I exterminate Putin.
Re: Bug in Left() function
«
Reply #3 on:
May 19, 2018, 04:32:44 pm »
Indeed.
As can be also demonstrated by pure FPC's:
Code: Pascal
[Select]
[+]
[-]
{$ifdef windows}{$apptype console}{$endif}
uses
sysutils
;
begin
writeln
(
leftstr
(
'-255R'
,
1
)
)
;
end
.
Programmer error.
Left
is BASIC syntax. (Was a programming language at some point).
«
Last Edit: May 19, 2018, 05:06:52 pm by Thaddy
»
Logged
Specialize a type, not a var.
Handoko
Hero Member
Posts: 5131
My goal: build my own game engine using Lazarus
Re: Bug in Left() function
«
Reply #4 on:
May 19, 2018, 05:43:58 pm »
I wonder how the TS didn't get the compile time error. Or if he used LeftStr, why he got the incorrect result ... maybe that Left function was written by himself.
Logged
jamie
Hero Member
Posts: 6091
Re: Bug in Left() function
«
Reply #5 on:
May 19, 2018, 05:46:53 pm »
Or a function of that NAME was created with those parameters and it just isn't working.....?
Logged
The only true wisdom is knowing you know nothing
PsaCrypt
New Member
Posts: 21
Re: Bug in Left() function
«
Reply #6 on:
May 20, 2018, 07:41:59 am »
yes, Lazarus use LeftStr(). Sorry.
Left() is mine.
«
Last Edit: May 20, 2018, 09:09:14 am by PsaCrypt
»
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