Re: NULL in variable defined AS STRING

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I think its just a very minimal implementation of "STRING" - it probably
wouldnt take a lot to implement STRING more fully - but doubt it will ever
have the coverage of the CHAR() and VARCHAR datatype etc - as I never used
it!

On Mon, 28 Apr 2025 at 08:09, Iwan AB <[email protected]> wrote:

> Dear Mike, please consider the following code:
>
> MAIN
>     DEFINE  s1 STRING, s2 CHAR(100)
>
>     LET s1 = NULL
>     IF s1 IS NULL THEN
>         DISPLAY "s1 IS NULL!"
>     ELSE
>         DISPLAY "s1 IS NOT NULL!"
>     END IF
>
>     LET s2 = NULL
>     IF s2 IS NULL THEN
>         DISPLAY "s2 IS NULL!"
>     ELSE
>         DISPLAY "s2 IS NOT NULL!"
>     END IF
>
> END MAIN
>
> it displays s1 IS NOT NULL! and s2 IS NULL, why is that?
>
> Best regards,
>
> Iwan Abu Bakar
> _______________________________________________
> Aubit4gl-discuss mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/aubit4gl-discuss
>

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<div dir=3D"ltr">I think its just a very minimal implementation of &quot;ST=
RING&quot; - it probably wouldnt=C2=A0take a lot to implement STRING more f=
ully - but doubt it will ever have the coverage of the CHAR() and VARCHAR d=
atatype etc - as I never used it!</div><br><div class=3D"gmail_quote gmail_=
quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, 28 Apr 2025 =
at 08:09, Iwan AB &lt;<a href=3D"mailto:[email protected]">[email protected]<=
/a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0=
px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><=
div dir=3D"ltr">Dear Mike, please consider the following code: <br><br>MAIN=
<br>=C2=A0 =C2=A0 DEFINE =C2=A0s1 STRING, s2 CHAR(100)<br><br>=C2=A0 =C2=A0=
 LET s1 =3D NULL<br>=C2=A0 =C2=A0 IF s1 IS NULL THEN<br>=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 DISPLAY &quot;s1 IS NULL!&quot;<br>=C2=A0 =C2=A0 ELSE<br>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 DISPLAY &quot;s1 IS NOT NULL!&quot;<br>=C2=A0 =C2=A0 E=
ND IF<br><br>=C2=A0 =C2=A0 LET s2 =3D NULL<br>=C2=A0 =C2=A0 IF s2 IS NULL T=
HEN<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 DISPLAY &quot;s2 IS NULL!&quot;<br>=C2=
=A0 =C2=A0 ELSE<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 DISPLAY &quot;s2 IS NOT NULL=
!&quot;<br>=C2=A0 =C2=A0 END IF<br><br>END MAIN<br><br>it displays s1 IS NO=
T NULL! and s2 IS NULL, why is that?<div><br></div><div>Best regards,</div>=
<div><br></div><div>Iwan Abu Bakar</div></div>
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>[email protected]</a><br>
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el=3D"noreferrer" target=3D"_blank">https://lists.sourceforge.net/lists/lis=
tinfo/aubit4gl-discuss</a><br>
</blockquote></div>

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