CU Amiga Super CD-ROM 2/CU Amiga Magazine's Super CD-ROM 02 (1996)(EMAP Images)(GB)[!][issue 1996-04].iso/magazine/amiga_e/amigae.jan.archive/000085_crash!undergrad…oo.ca!clgonsal_Fri, 28 Jan 94 01:06:22 PST.msg

Text File | 1994-02-17 | 13KB | 342 lines

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In-Reply-To: <[e-mail]> from "Joseph E. Van_Riper III" at Jan 26, 94 10:42:22 am
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From: Carl Laurence Gonsalves <[e-mail]>
To: [e-mail]
Subject: Re: circles

> However, if it was 'char c', and later you see 'mystery-variable = *c' then the
> '*' refers to the address of the variable 'c' (that is, it's EXACTLY like E's
> use of {}).
...
> char c;                               DEF c
>   c = 'M';                              c := "M"
>   mystery_variable = *c;                mystery_variable := {c}

Sorry, this one is WAY off. the above code will NOT compile. You'll get an
error. The * is used for three things in C:

1. multiplying (yay)
2. declaring a pointer
3. pointer indirection

The first is the familiar old: a=b*c that even BASIC has...

The second is used like this:

char *c; /* c is a pointer to a char */

The third is used like this:

char b;
...
b=*c; /* Now b holds the value c pointed to */

The * operator *cannot* be used to find the address of something. That
wouldn't make sense. If it could work either way then how do you know the
"b=*c" in the above isn't "make b hold the address of c"? To find the
address of something you use the address of operator, which in C is the
ampersand (&). ie:

char *a;
char b='X';
...
a=&b; /* a points at b */

The C code you posted would actually give an error like:

"ERROR!: expecting (char **) found (char)"
or GCC's wonderful:
"invalid type argument of `unary *'"

("unary *" is the indirection operator, while "binary *" is the
multiplication operator...)

--
   __
__/// [e-mail] - Only Amiga Makes it Possible!
\XX/ Life is pain. Anyone who says differently is trying to sell something
From crash!v1.ph.ox.ac.uk!DORAN Fri, 28 Jan 94 04:41:53 PST
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Date: Fri, 28 Jan 1994 11:57:49 GMT
Message-Id: <[e-mail]>
From: Pott Shrigley <[e-mail]>
To: [e-mail]
Subject: E 3.0 ?

I'm new to this list and have heard constant talk of E version 3.0. Do any of
you have the specifications for it? What changes etc? When it will be
available?

Cheers!


Dave.
From crash!westminster.ac.uk!vaald Fri, 28 Jan 94 04:42:07 PST
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Subject: <none>

LIST
From crash!plucky.ike.safb.af.mil!bwills Fri, 28 Jan 94 05:42:29 PST
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Date: Fri, 28 Jan 94 07:13:54 CST
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From: [e-mail] (Barry D Wills)
To:
Subject: Re: Egads.e - Gad-demo in E

~8> Hi Barry,

Hi, Jim.

~8> Sorry to bug you again but I'm having some trouble with your source.
~8> EC doesn't like this line at all:
~8>
~8>           screenFont   : PTR TO textfont
~8>
~8> I get the "unknown object identifier" error on it every time.  I've
~8> looked through the modules and I can't find a textfont object
~8> anywhere.  Where is it supposed to come from?

No bother.  The error is mine.  In the 2.1b modules, "textfont"
is called "tf".  Damn, sorry!

-- Barry
From crash!uniwa.uwa.edu.au!multi!robbage Mon, 31 Jan 94 00:20:09 PST
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In-Reply-To: <[e-mail]> from "R. Alan Monroe" at Jan 25, 94 04:21:33 pm
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From: [e-mail] (Rob Nottage)
To: [e-mail]
Subject: Re: fonts

> How do you print in other fonts in an intuition window???

What function are you using to 'print'?

> I used OpenDiskFont to get 'times 18' from disk,
> then SetFont(stdrast,mywin) but it prints blank...

Did you open the window with OpenW() or with OpenWindowTagList() ?

If the second choice then set stdrast to the window's rport.

--
   ___________________________________
  /                                   \
  |  [e-mail]   |
  |  Rob Nottage 3:690/662.0@FidoNet  |
  |             41:616/662.0@AmigaNet |
  \___________________________________/
From crash!cogs.susx.ac.uk!robda Mon, 31 Jan 94 00:20:18 PST
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In-Reply-To: <[e-mail]> from "Pott Shrigley" at Jan 28, 94 11:57:49 am
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From: "Robert Dabell" <[e-mail]>
To: [e-mail]
Subject: Re: E 3.0 ?

> I'm new to this list and have heard constant talk of E version 3.0. Do any of
> you have the specifications for it? What changes etc? When it will be
> available?

I'm new too :-)

3.0, is 2.5 even available yet, as far as I know that was to be the first
commercial release, and I've heard nothing more of that...


Later...
        Robert
From crash!rbhp56.rbg.informatik.th-darmstadt.de!anh Mon, 31 Jan 94 00:20:55 PST
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Date: Fri, 28 Jan 94 16:04:19 MEZ
Full-Name: Olivier Anh
Mailer: Elm [revision: 66.25]
From: Olivier Anh <[e-mail]>
To: [e-mail]
Subject: Thanx !

Hi all,

Hey Barry, thanx for your code, I'll try it as far as i can... !!!!
This is a very great help. BIG Thank you.


--
-------------------------------------------------------------------------------
   / / Olivier ANH   (ERAMUS Student)     |' And may the Force be with You ! '
\ X /  [e-mail] |             - Return of the Jedi -
-------------------------------------------------------------------------------
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In-Reply-To: <[e-mail]> from "[e-mail]" at Jan 27, 94 10:24:05 pm
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From: "Robert Dabell" <[e-mail]>
To: [e-mail]
Subject: Re: EFormat

> >Oh, I'm using 2.04 and in my WBStartup drawer I have the following:

> >AddTools
> >DropBox
> >Exchange
> >MagicMenu
> >RexxMast
> >RTPatch
   ^^^^^^^
> >Storage
> >Yak

Though I don't know what the problems are I'd suggest checking RTPatch, if was
giveing me trouble recently with a similar setup, set the NOINTUITION flag as
that fixed thing for me fine :-)


Ciao,
     Robert
From crash!comlab.oxford.ac.uk!ecs.oxford.ac.uk!m88jrh Mon, 31 Jan 94 00:21:25 PST
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Message-Id: <[e-mail]>
From: [e-mail]
To: [e-mail]
Subject: Re: Help with pointers


Bernie Cosell wrote:

>
>     DEF grid:PTR TO CHAR
>     DEF p:PTR TO CHAR
>
>     grid := New(<big>)
>
>     p := grid
>     FOR i := 1 to 10 DO ^p++ := "'"
>

Two problems:

1)  You don't check the value of grid after the New() call (unless you've got
    an automatic exception handler on it that you haven't mentioned). I hope
    I'm not being obvious by suggesting you check the return value is not
    NIL before using it via p.
2)  The ^ operator is really only to be used in conjunction with {<var>},
    which gets a LONG address.  So that's why ^ refers to LONG values (i.e.,
    your pointer is then assumed to be a PTR TO LONG).  What you wanted to
    write is:

       FOR i:=1 TO 10 DO p[]++:="'"

    I made this mistake, too, and was quickly put right by Wouter himself.
    He frowns on uses of {<var>} and ^, and says we ought to use [] etc.
    I think I agree with him...

---
   _____  _
     /   / |    /  /
    /   /__/   /__/      Jason R. Hulance
   /   /\     /  /   <[e-mail]>
|_/ . /  \ . /  / .
From crash!mhd1.moorhead.msus.edu!platt Mon, 31 Jan 94 00:21:37 PST
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From: [e-mail] (Vincent Platt)
To: [e-mail]
Subject: Re: EFormat

I'm not having any major problems with 1.3.  It still gurus once in a
while, but at least it doesn't kill my command line.  I like it too much
to give up, thanks.