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From: smd@umcp-cs.UUCP (Stanley Dunn)
Newsgroups: net.micro,net.micro.cpm,net.lang.pascal,net.micro.pc
Subject: Turbo Pascal Version 3.00
Message-ID: <2258@umcp-cs.UUCP>
Date: Tue, 19-Nov-85 13:59:59 EST
Article-I.D.: umcp-cs.2258
Posted: Tue Nov 19 13:59:59 1985
Date-Received: Thu, 21-Nov-85 04:11:15 EST
Distribution: net
Organization: U of Maryland, Computer Science Dept., College Park, MD
Lines: 56
Xref: watmath net.micro:12765 net.micro.cpm:4906 net.lang.pascal:379 net.micro.pc:5917

Replace this line with your compiler bug

I sat down to write the program for the next project I am going
to give to my Computer Science I class at home on my CPM system
with Turbo Pascal Version 3.00.  The following program illustrates
the problem with the program I wrote:

program junk(input,output);
procedure proca(chita:char); forward;
procedure procb(chitb:char);
begin
     writeln('Entering procb with a ',chitb);
     proca('A');
     writeln('Leaving procb with a ',chitb);
end;
procedure proca;
begin
     writeln('Entering proca with a ',chita);
     if chita = 'I' then procb('I');
     writeln('Leaving proca with a ',chita);
end;
begin
     proca('I');
end.

The output using Turbo Pascal was:

     Entering proca with a I
     Entering procb with a I
     Entering proca with a A
     Leaving proca with a A
     Leaving procb with a I
     Leaving proca with a A

While the output for the same program on a VAX with BSD UNIX,
IBM VM/SP CMS, or a Macintosh with MacPascal was:

     Entering proca with a I
     Entering procb with a I
     Entering proca with a A
     Leaving proca with a A
     Leaving procb with a I
     Leaving proca with a I

as I expected.  Calling Borland Technical Support was no help,
as they wanted a copy of the program on an IBM format disk.
The technical support specialist asked me to send a copy of the
program on a disk.  When I asked "in what format?" she replied
"IBM, of course."  I guess CPM does not exist anymore.

Obviously, I was quite surprised at the output, and now I
wonder how they tested the compiler.  It seems that a program
as simple as the one above should have been tested.

-- Stanley Dunn
   University of Maryland Department of Computer Science