likely bug in FPC v3.2.2
lazarus / 64-FPC development

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440bx · 2024-07-19 22:40

Hello,

Consider this code:Code: Pascal  [Select][+][-]window.onload =
function(){var x1 = document.getElementById("main_content_section");
if (x1) { var x = document.getElementsByClassName("geshi");for (var i
= 0; i {$APPTYPE CONSOLE} program _ComparisonOperators; var  ADword,
AnotherDword : DWORD;  begin   ADword       := $48;  AnotherDword :=
$BC;   if ADword >- AnotherDword then  begin    writeln(ADword, ' is
>- ', AnotherDword, ' (whatever that means!)');  end;   readln;end.
Note the likely invalid comparison operator in use ">-", yet the
compiler doesn't complain.  Running the program shows the comparison
is TRUE.

Comments welcome.

ETA:

As correctly pointed out by GAN below, there is no bug.  The compiler
"sees" >- as "greater than minus (whatever follows)" which is correct.

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GAN · 2024-07-19 23:12

Hello, a very simple answer/comment:

I think the compiler replace with integer values before de
comparision, so:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i if ADword
72 > -188 then 
yes, it is True.

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440bx · 2024-07-19 23:18

Quote from: GAN on July 20, 2024, 01:12:05 amHello, a very simple
answer/comment:

I think the compiler replace with integer values before de
comparision, so:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i if ADword
72 > -188 then 
yes, it is True.
You are absolutely right.  I didn't think of that and, now that you've
pointed it out, it looks obvious.

Thank you!

Conclusion: no bug in the compiler.  bug in OP's brain that caused
incorrect expression parsing