[Oberon] SYSTEM Modules

[Jörg Straube]

You‘re right. It’s not the safety I‘m referring to but rather the portability.

Eg 
  n := ORD(ch) - ORD(“A“);
  Out.Ch(ch); Out.String(“ is the “);
  Out.Int(n, 0); Out.String(„th character.);

Will work with ASCII but not with EBCDIC.

Jörg

> Am 11.11.2018 um 23:02 schrieb Richard Hable <informujo at aon.at>:
> 
>> On 11.11.18 22:35, Jörg Straube wrote:
>> 
>> Yes, safe/unsafe is the definition with the very prominent exception of ORD.
> 
> I don't see any unsafety with the ORD function: different systems use
> different characters sets, thus the resulting character code values can
> vary.
> 
> Similarily, different systems use different line endings, thus the
> procedure Out.Ln may output an LF character on Unix-like systems and the
> CR/LF sequence on Windows systems.
> 
> The programmer simply has to be aware of such differences.
> 
> Richard
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