[fpc-devel] StrToInt -- Strange behaviour

[Ewald]

Once upon a time, Sven Barth said:
> On 21.02.2013 21:01, Ewald wrote:
>>
>> Apparently the StrToInt function interprets strings starting with an `x`
>> as hexadecimal numbers? This behaviour seems rather strange to me
>> (strings starting with 0x would be a bit more understandable, but then
>> again, we're programming pascal here, not C) and it is not mentioned in
>> the documentation. What do I do with it?
>
> IntToStr simply calls through to Val and there is documented (more or
> less) that it supports binary (%), octal (&) and hexadecimal ($, 0x)
> values as well (see here:
> http://www.freepascal.org/docs-html/rtl/system/val.html ). That it
> also supports 'x' and 'X' as a prefix for hexadecimal values is
> because of Delphi compatibility.
>
> As a sidenote: the prefixes %, & and $ can be used in normal source
> code as well.
Of course, these I use, but the `xabcd` syntax cannot be used in source
code to represent numbers. Hence my confusion about what to do with it.

>
>> A- File a bug concerning incomplete documentation?
>> B- File a bug concerning incorrect behaviour of StrToInt()?
>> C- Do nothing and live with it.
>> D- ....?
>
> I'd say A. On the one hand a reference from StrToInt(64),
> StrToInt(64)Def and TryStrToInt(64) to Val should be added and on the
> other hand Val's documentation should be extended by the fact that
> '0x', 'X' and 'x' are valid prefixes for hexadecimal values as well.
> And while we're at it references from the 32bit StrToInt variants to
> the 64bit variants could be added as well (they do exist the other way
> round as one can see here:
> http://www.freepascal.org/docs-html/rtl/sysutils/strtoint64.html ).
>
> So if you would please be so kind to open a bug report :)
Here you go: http://bugs.freepascal.org/view.php?id=23933 :-)


-- 
Ewald

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