EnigmA Amiga Run 1995 November/EnigmA AMIGA RUN 02 (1995)(G.R. Edizioni)(IT)[!][issue 1995-11][Skylink CD].iso/earcd/program/amos/amoslis0.lzh/AMOSLIST/[e-mail]_Mon Aug 7 08:57:35 1995.msg

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Date: Mon, 7 Aug 1995 12:41:02 +0200 (METDST)
From: Branko Collin <[e-mail]>
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To: Amos Discussion List <[e-mail]>
Subject: Re: Bugs and Stuff
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On Fri, 4 Aug 1995, Robert Andrew Currie wrote:

> >
> > DL> I'm tracking down exactly what causes some of them.
> >
> >  JEF>  Speaking of bugs. In one or two of the old Amoslists I read about
> >  JEF> a Amos Bug list someone made. Does anyone have it? I think it would
> >  JEF> help some of us new to the list. If anyone has it could you please
> >  JEF> post it to the list, or maybe put it on Aminet or Andy's WWW site?
> >  JEF> It would be a great help to me to know beforehand if my game will
> >  JEF> run once compiled or if I will have to rewrite parts of it yet
> >  JEF> again.
> >
> > I made the offer to collate all the bugs that people find , sort thru them,
> > and make them available. All I asked was for people to send a description
> > of the bug to me. Guess how many replies I got?
> >
> > ONE
> >
> > I guess people weren't interested.
> >
>     I have a few bugs for you. These are what I have noticed
> from my version 1.35 of Creator.
>
> Math Error-- Seems to do calculations in wrong order. Fix by
> simply putting brackets around calculation.
>
> String Error-- Amos doesn't seem to create new memory areas for
> copies of strings. This error would screw up my program code
> because I would read a string from a Data line, alter the string
> without changing it's length and I would corrupt the Data line.
> It is as if it doesn't allocate memory, it simply views the new
> variable as a pointer to the old location until change the size
> of the string by adding or subtracting. Fix it by adding and then
> subtracting a space from the new variable or allocate the memory
> youself and then use copy to transfer the data.
>
> Wait Error-- the Wait n command does not seem to work with
> variables. It works fine with constants but not variables.
>

I tried the following program:
For I=1 To 100
    T=Timer
    Wait I
    Print Timer-T
Next I

This works fine. I tried replacing 'Wait I' with 'Wait I/2+1' and that
worked fine too. What it won't do is 'Wait 0' or instead of 0 any
expression that will end up as 0 (for instance I/2 when I=1). The error
it gives then is 'Illegal function call'.

> If Error-- cannot compare more than one string value in an if
> statement. It would simply ignore any extra conditions.
>

On my machine it gives a Type Mismatch error. However, if I parenthesise
it heavily, it will work. Only the 'Not' constant will cause a Syntax
error when included. Not will work with integers, though. String
evaluations will work with or, and & xor.

Note (though I have not tested this yesterday) that the 'or' statement
will only evaluate the expression on its left, if you do not use parentheses.

So 'If A$="a" and B$="b"' must be entered as 'If ((A$="a") and
(B$="b"))'. Otherwise it will generate an error.
'If A=1 or B=2' will not generate an error, but will only evaluate the
first expression (is it called an expression?). To make it work, you will
have to use 'If ((A=1) or (B=2))'.

> For Next Error-- has problem doing negative stepping in loop
> using variable as the step. I haven't thouroughly tested this one
> but I think Amos doesn't do the calculation correctly in the step
> field. Fix it by calculating the step before the loop.
>

This does not sound like a bug: If you mean that you used something like:
For I=10 To 1 Step STP
    STP=-(I/2+1)
    'Do your stuff
Next I

then you did something that is not allowed in Amos. (Of course this bit
of code is the same as 'For I=10 To 1 Step -(I/2+1)' etc.)

> I probably have more but I have to think a little. Don't take
> these as general errors because these are only errors that I have
> discovered in my version, and possibly they may be fixed or there
> might be something I am doing wrong( I just didn't spend the time
> to solve each and every one. That is a lesson I learned from C
> programming. If one command doesn't work right, select one of the
> other 30 commands that seems to fit the job. :)  ).
>

I use Amos 1.36 on a 2+4 meg A1200. The 1.36 upgrade docs only mention
the AGA fix.

Could you give some example code for the bugs I did not write about
(Math, String and while your at it For-Next)? I did not understand
entirely what the problem is.

Let's get this buglist going :-).

.... .  .    .      .           .            .      .    .  . ....
   Branko Collin                                 [e-mail]