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why still use C?

no this is no trollposting and please don't get it wrong but iam very
curious why people still use C instead of other languages especially C++.

i heard people say C++ is slower than C but i can't believe that. in pieces
of the application where speed really matters you can still use "normal"
functions or even static methods which is basically the same.

in C there arent the simplest things present like constants, each struct and
enum have to be prefixed with "struct" and "enum". iam sure there is much
more.

i don't get it why people program in C and faking OOP features(functi on
pointers in structs..) instead of using C++. are they simply masochists or
is there a logical reason?

i feel C has to benefit against C++.

--
cody

[Freeware, Games and Humor]
www.deutronium.de.vu || www.deutronium.tk
--
comp.lang.c.mod erated - moderation address: cl**@plethora.n et
Nov 13 '05
687 23893
Fergus Henderson <fj*@cs.mu.oz.a u> wrote in message news:<3f******* *@news.unimelb. edu.au>...
....
The difference is generally small, but it does exist. Compilers have
less freedom to reorder code that might throw exceptions.


An issue that does not apply to code which uses only the common subset
of C and C++, where care is taken to ensure that the code has the same
meaning in both languages.
Nov 13 '05 #181
Mark McIntyre <ma**********@s pamcop.net> wrote in message news:<1o******* *************** **********@4ax. com>...
On Sun, 12 Oct 2003 15:58:13 +0200, in comp.lang.c , "cody"
<do************ *********@gmx.d e> wrote:
This is no encapsulation. encapsulation means that nobody (except the class itself)
can access the variable directly, or the direct acess is limited to certain
classes for example derived classes or friend classes.


This is what C++ defines encapsulation as, sure. But encapsulation was
around before C++ you know.Try to define it without using C++isms,
before you spout caeculum tauri.


Without language support for encapsulation, attempts to reference
something from inappropriate locations in the code is something that
can only be prevented by very careful checking by fallible human
beings during code reviews. With such language support, some such
errors can be automatically checked for by the compiler.

The option of using opaque types in C code provides some support for
encapsulation, but nowhere near as much support as C++ provides.
Nov 13 '05 #182
In article <8b************ **************@ posting.google. com>, ku****@wizard.n et
says...
Fergus Henderson <fj*@cs.mu.oz.a u> wrote in message news:<3f******* *@news.unimelb. edu.au>...
...
The difference is generally small, but it does exist. Compilers have
less freedom to reorder code that might throw exceptions.


An issue that does not apply to code which uses only the common subset
of C and C++, where care is taken to ensure that the code has the same
meaning in both languages.


Not so. A function written in C++ that calls another function cannot assume
that the called function will not throw an exception. Therefore it *must*
retain enough information to reconstruct the call stack so that the exception
handling mechanisms still work (and it can't do code reording as suggested by
Fergus Henderson.) In C, on the other hand, the mechanism for reconstructing
the stack need only preserve the ability to properly return to the calling
function. This difference can result in substantially different object code.

--
Paul Hsieh
http://www.pobox.com/~qed/
Nov 13 '05 #183

James Kuyper wrote:

Fergus Henderson <fj*@cs.mu.oz.a u> wrote in message news:<3f******* *@news.unimelb. edu.au>...
...
The difference is generally small, but it does exist. Compilers have
less freedom to reorder code that might throw exceptions.


An issue that does not apply to code which uses only the common subset
of C and C++, where care is taken to ensure that the code has the same
meaning in both languages.


The Hewlett-Packard PA-RISC aC++ compiler (table-driven EH, maximum
optimization level):

SPEC SPEED SIZE
BENCHMARK PENALTY(%) PENALTY(%)

099.go 15.60 0.21
129.compress 2.00 <0.01
130.li 11.15 1.24
132.ijpeg –0.49 0.06
134.perl 0.81 1.02
147.vortex 0.66 –0.04

(source: computer.org/concurrency/pd2000/p4072abs.htm)

regards,
alexander.
Nov 13 '05 #184
cody wrote:
Is it feasible to interpose a proxy library whose headers are
conforming C code that's compiled with a C++ compiler and that calls
functions from the C++ library?
when you have a C++ Library you can only call C-Style-Functions from that
Library. You cannot export Classes/Methods from that Library.


Unfortunately, "doh" doesn't map well to ascii (the question already
suggests 'interposing a proxy library').

This means writing a number of C++ functions to get rid of the classes,
declaring the functions extern "C", and linking to a C program using a
C++ aware linker.

And yes, this should work (does so with gcc, at least). Things like
global C++ object constructors/destructors are properly executed, and
exceptions are properly handled (but cannot, of course, be propagated
into the C domain - the proxy library should take care of them).

Sidney

Nov 13 '05 #185
> size_t s = sizeof ('a');

will set s to sizeof (char) = 1 on all C++ compilers, and set s to
sizeof (int) on C compilers, which is in practice greater than 1.


sizeof (int)==sizeof ('a') is never true on no C nor C++ compiler on this
world.

--
cody

[Freeware, Games and Humor]
www.deutronium.de.vu || www.deutronium.tk
Nov 13 '05 #186
Alexander Terekhov wrote:
SPEC SPEED SIZE
BENCHMARK PENALTY(%) PENALTY(%)


Don't bring reality into this discussion!

Nov 13 '05 #187
j

"cody" <do************ *********@gmx.d e> wrote in message
news:bm******** ****@ID-176797.news.uni-berlin.de...
size_t s = sizeof ('a');

will set s to sizeof (char) = 1 on all C++ compilers, and set s to
sizeof (int) on C compilers, which is in practice greater than 1.


sizeof (int)==sizeof ('a') is never true on no C nor C++ compiler on this
world.

--
cody

[Freeware, Games and Humor]
www.deutronium.de.vu || www.deutronium.tk


# cat qed.c
#include <stdio.h>
int main(void)
{
if(sizeof(int) == sizeof 'a')
puts("Read c99 6.4.4.4#10 -- Q.E.D");
return 0;
}
# ./qed
Read c99 6.4.4.4#10 -- Q.E.D
#

As Dan Pop would say: ``Engage your brain before posting''

Nov 13 '05 #188
cody wrote:
sizeof (int)==sizeof ('a') is never true on no C nor C++ compiler on this
world.


To the contrary, it is required of every C compiler that
conforms to the standard. (C++ is a different story.)

I suggest that you consider that perhaps the posters to
whom you're responding know more than you do about the
subjects they're discussing. In order to contribute in
a positive way, you need to learn more.

Nov 13 '05 #189
"cody" <do************ *********@gmx.d e> wrote:
size_t s = sizeof ('a');

will set s to sizeof (char) = 1 on all C++ compilers, and set s to
sizeof (int) on C compilers, which is in practice greater than 1.


sizeof (int)==sizeof ('a') is never true on no C nor C++ compiler on this
world.


That would mean that there is no conforming implementation available
at all; once more you show your lack of C knowledge. Lookup ISO/IEC
9899:1999 6.4.4.4#10 for an explanation why you are wrong.

Hint: what is the type of 'a'?

Regards
--
Irrwahn
(ir*******@free net.de)
Nov 13 '05 #190

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