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From: Mirsad Todorovac
Subject: `Val' function problems
Date: 13 Aug 2003, 11:10:16

On Tue, 12 Aug 2003, Frank Heckenbach wrote:

> Adriaan van Os wrote:
>
> > Frank Heckenbach wrote:
> >
> > > Mirsad Todorovac wrote:
> > >>
> > >> 1. Does Borland Pascal do teh same, or is it a GPC bug?
> > >
> > > Now I'm surprised. BP seems to always set x = 0 when ec <> 0, i.e.
> > > when invalid characters are found.
> > >
> > > Can any BP user confirm whether that's the expected behaviour? (I've
> > > always used `Val' for entire number strings, so ec <> 0 would be an
> > > error in my programs, so I've never noticed this behaviour.)
> > >
> > > If that's really so in BP, I suppose we should change it in GPC.
> >
> >  From the Turbo Pascal 6.0 Library Reference:
> >
> > "Val( S: String; var V; var Code: Integer)"
> >
> > "... If the string is somehow invalid, the index of the offending
> > character is stored in Code;
>
> The question is if V is (guaranteed to be) zero then.

The other side of the story is that Val could be used more flexible, i.e.
for parsing if "best effort" has been done, and string has been
converted-up to the first invalid character/digit.

Mirsad

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