From:	cosc19z5 AT Bayou DOT UH DOT EDU (Spasmo)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Problem with Some Objective-C Code
Date:	29 Sep 1996 08:07:27 GMT
Organization:	University of Houston
Lines:	102
Message-ID:	<52lanv$d3e@Masala.CC.UH.EDU>
NNTP-Posting-Host:	bayou.uh.edu
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Hey all.

I downloaded and set up djgpp so I could do some Objective C 
programming (or rather learning), yet after downloading
some sample code from a web site and compiling it, the
program crashed when I tried to run it.  I got an error
about a floating point exception with a trace back, but
there was no numerical manipulation in the code!  It was
a hello world program!!!  Anyway when I ran it via go32-v2,
ran and THEN crashed.

Anyway here's the code (directly off a web site so credits
to those).  If anyone knows if the code is at fault or
if I need to goof with some settings, by all means tell me.

Thanks in advance.

Code follows:

   
                                    PRINTER
                                       
   
     _________________________________________________________________
   
   Presented below is a simple program written in Objective-C.
   
   The compile command for this program(using the GNU compiler) would be:
   
   
   gcc -lobjc main.m printer.m -o test
   (BTW, the -lobjc shouldn't be at the front)

     _________________________________________________________________
   
  MAIN.M


// This will create a Printer object, set it's string and tell it to print

#import "Printer.h"

void main()
{
   id printer = [[Printer alloc] init];
   [printer addStringValue:"Hello World!"];
   [printer print];
   [printer free];
}

  PRINTER.H


#import <objc/Object.h>

@interface Printer : Object
{
   char buffer[100];
}

- init;
- addStringValue:(const char*)astring;
- print;
- clear;

@end

  PRINTER.M


#import "Printer.h"

@implementation Printer

- init
{
   [super init];
   [self clear];
   return self;
}

- addStringValue:(const char*)astring
{
   strcat(buffer, astring);
   return self;
}

- print
{
   printf("%s\n",buffer);
   [self clear];
   return self;
}

- clear
{
   strcpy(buffer, "");
   return self;
}

@end

- Raw text -