Date: Wed, 12 Nov 2003 01:59:44 +0100 From: Erik Trulsson <ertr1013@student.uu.se> To: Chris Howells <howells@kde.org> Cc: freebsd-questions@freebsd.org Subject: Re: Another Newbie Question: C or C++ Message-ID: <20031112005944.GA90535@falcon.midgard.homeip.net> In-Reply-To: <200311120028.32412.howells@kde.org> References: <200311102314.hAANEpc25533@clunix.cl.msu.edu> <200311111403.13202.howells@kde.org> <448ymmcxv8.fsf@be-well.ilk.org> <200311120028.32412.howells@kde.org>
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On Wed, Nov 12, 2003 at 12:28:32AM +0000, Chris Howells wrote:
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> Hash: SHA1
>
> Hi,
>
> On Tuesday 11 November 2003 23:02, Lowell Gilbert wrote:
>
> > each other. [There is a myth that C++ is a superset of C, but this is
> > not really the case.]
>
> C++ is based on C. Any C code (providing it does not use certain key word that
> are reserved in C++) can be compiled in a C++ compiler.
Wrong. C++ is based on C, but it has made some changes so it is not
quite a superset of C.
Try for example the following little program:
#include <stdlib.h>
int main(void)
{
char *a;
a=malloc(10);
if(a) free(a);
return 0;
}
This is valid C, but not valid C++. (C++ does not perform automatic
conversion between void pointers and other pointers.)
This should suffice to demonstrate that C++ is not really a superset of
C. The intersection between C and C++ is a usable programming language
though, but it is rarely worth the trouble to restrict oneself to that
subset of the languages.
--
<Insert your favourite quote here.>
Erik Trulsson
ertr1013@student.uu.se
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