From:	"John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Still trying with OOP in DJGPP
Date:	Tue, 21 Apr 1998 18:59:43 -0400
Organization:	Two pounds of chaos and a pinch of salt.
Lines:	58
Message-ID:	<353D24DF.719F@cs.com>
References:	<353CF58E DOT CAC7C9A3 AT seric DOT es>
NNTP-Posting-Host:	ppp246.cs.com
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

loren wrote:
> 
> DJGPP gives me this error: "parse error before 'class'" or something
> like this ...
> Maybe i have to install some additional packages for doing OOP ...
> I don't know ...
> Any1 can help me, pliz?

It seems you're a bit confused about what a programming language is. 
Let me try to help.

DJGPP is a development environment that supports multiple programming
languages.  The basic compiler supports the C language, and you can add
on additional modules to allow compilation of C++, Objective C, Fortran,
Pascal, and several others.

C is a procedural language.

C++ is an object-oriented language derived from C syntax.

The two are not the same.

Neither does the term "OOP" (Object Oriented Programming) denote any
specific language.  It merely describes a set of features that all OO
(Object Oriented) languages should have in common.  There are dozens of
OO languages, such as C++, Ada, Java, etc.

To compile C++ programs, you also need to download the C++ compiler,
which is contained in two zipfiles.  If you already downloaded
v2gnu/gcc2721b.zip, then you must get v2gnu/gpp2721b.zip and
v2gnu/lgp271b.zip.  If you already downloaded v2gnu/gcc280b.zip, then
you need v2gnu/gpp280b.zip and v2gnu/lgpp280b.zip.  These packages are
installed in the same manner as the rest of the DJGPP packages.

Once the appropriate packages are installed, you must give the compiler
some way to know whether your program is to be compiled as C or C++.  C
files end in the extension .c, i.e., "myprog.c", "dothis.c", etc.  The
case of the extension is important.  C++ files may end in several
extensions:  .C (note uppercase C), .cc, .cpp, and .cxx.  Examples: 
"oop.C", "program.cc", "hello.cpp", "dothat.cxx".

If you give the compiler a file with the correct extension, it will
compile your program properly.  If you don't, it has no way to tell that
you really meant a C++ program, and it will refuse to compile it.

If you still don't understand, please try to find a more appropriate
source of teaching, such as a class or a C++ textbook.  It's very
difficult to teach basic programming via email.

hth!

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