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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

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++.


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comp.lang.c.mod erated - moderation address: cl**@plethora.n et
Nov 13 '05
687 23872
kelseyb wrote:

You are making many points that are very similar to Mark's in your two
posts, but from my side I would like to put this thread to rest now,
since it deteriorated into rehashing the same arguments post after post.

So thanks for your posts (read them with sincere interest), I am very
much tempted to provide answers that perhaps could show the merits of my
point-of-view, but I will refrain from doing so since basically all
arguments have already been made in my exchange with Mark.

Best regards, Sidney

Nov 13 '05 #361
On Wed, 22 Oct 2003 06:02:49 +0000 (UTC), in comp.lang.c , Richard
Heathfield <do******@addre ss.co.uk.invali d> wrote:
that didn't mean it was an off-road vehicle,
except in the hospitalisation sense of the word.

So you'll definitely be upgrading to the new model then? :-)

Mark McIntyre
CLC FAQ <http://www.eskimo.com/~scs/C-faq/top.html>
CLC readme: <http://www.angelfire.c om/ms3/bchambless0/welcome_to_clc. html>
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Nov 13 '05 #362
P.J. Plauger <pj*@dinkumware .com> scribbled the following:
"James Kuyper" <ku****@wizard. net> wrote in message
news:8b******** *************** ***@posting.goo gle.com...
> > PJ we already know you're a heathen, so no need to chime in... :-)
> Nice of you to notice. In fact, I've been officially recognized as
> a heathen by the All Catholic Church. It's a point of pride with me.
Congratulations ! How did you win this honor? No one's ever bothered
giving me official recognition. :-(

I married a nice Catholic girl. I told the priest who registered our banns
that I was raised in a Protestant household. That didn't bother him too
much until I observed that I never quite got around to being baptized.
At that point, he wrote 'heathen' next to my name and literally sent me
out of the room. Never spoke to me again, in fact. (That marriage lasted less than five years. Tana and I were married in
Manhattan Borough City Hall by a J.P. We'll celebrate our 26th anniversary
in Kona next week with our kids. Go figure.) For the record -- and your C question is?

How can I get officially branded as a heathen too, without (1) marrying
anyone or (2) joining the Protestant Church?

/-- Joona Palaste (pa*****@cc.hel sinki.fi) ------------- Finland --------\
\-- http://www.helsinki.fi/~palaste --------------------- rules! --------/
"Remember: There are only three kinds of people - those who can count and those
who can't."
- Vampyra
Nov 13 '05 #363
"E. Robert Tisdale" wrote:
CBFalconer wrote:
I and, apparently, almost everyone else, thinks that
your malloc casts are ridiculous.
I don't think that they are ridiculous.

I don't know why I bother replying, but without it some dewy eyed
newbie might think you know what you are talking about.
The only possible reason for them is to compile with C++
which all consider a spurious reason.
I don't think that it is a spurious reason.
C++ is, after all, the future of C.

Further nonsense. The languages are different. Neither is Ada
the future of C.
However, the enum <-> int case is different.
It is the only way, apart from struct,
to truly create a new data type in C.
Evidently, Brian W. Kernighan and Dennis M. Ritchie
disagree with you,
"The C Programming Language: Second Edition",
Appendix A: Reference Manual,
Section 4: Meaning of Identifiers,
Subsection 3: Derived Types, page 196.

Once more, you display abysmal ignorance. Derived types are not
generally new types. One can define a type by:

typedef enum quality {GOOD, INDIFFERENT, BAD} quality;

and declare items of type quality. They should never hold values
other than those enumerated. The problem is 'how to persuade the
C compiler to verify that'. C is a very poor language for strong

The ordinal values associated with GOOD, INDIFFERENT, BAD have no
special meaning other than defining an ordering. Things with this
attribute may have the quality GOOD, or BAD, but 42 has no
meaning. Neither does 1, except that C will treat it as
INDIFFERENT, and such usage often indicates an error.
As long as those assignments go unflagged,
it does very little good (but is not useless).
I think you (and I) would be happy
if gcc could be told to emit a warning for such usages.

Chuck F (cb********@yah oo.com) (cb********@wor ldnet.att.net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home .att.net> USE worldnet address!
Nov 13 '05 #364
Sidney Cadot wrote:
.... snip ...
Sure, this is not very practical. But it goes to illustrate the
point that leaving the cast to the assignment is presuming too
much. Sad thing (for my argumentation anyway) is that you do
assign the malloc() result in 99% of cases, and even in your
strcpy example there will be an implicit cast to the type of
the format argument. Darn :-)

If you don't assign the result from a malloc() you are guaranteed
a memory leak. I would consider this to be ungood.

Chuck F (cb********@yah oo.com) (cb********@wor ldnet.att.net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home .att.net> USE worldnet address!
Nov 13 '05 #365
Jeremy Yallop wrote:

Default User wrote:
"E. Robert Tisdale" wrote:
My GNU C compiler easily detects the missing declaration for malloc
with or without the cast.

There's no requirement for an implementation to do the above.

There is such a requirement in C99, where calling an undeclared
function is an error (a syntax error, if footnotes are to be

And when fully compliant C99 compilers become the norm, then we'll talk
again. I don't have one, do you?

Brian Rodenborn
Nov 13 '05 #366
CBFalconer wrote:
Sidney Cadot wrote:

... snip ...
Sure, this is not very practical. But it goes to illustrate the
point that leaving the cast to the assignment is presuming too
much. Sad thing (for my argumentation anyway) is that you do
assign the malloc() result in 99% of cases, and even in your
strcpy example there will be an implicit cast to the type of
the format argument. Darn :-)

If you don't assign the result from a malloc() you are guaranteed
a memory leak. I would consider this to be ungood.

Doubleplus ungood, for sure. But just for some theoretical fun....:

#include <stdio.h>
#include <stdlib.h>
char B[100], *p;
sprintf(B, "%p", malloc(20));
sscanf(B, "%p", (void **)p);
return 0;

Best regards, Sidney

Nov 13 '05 #367
Sidney Cadot wrote:
#include <stdio.h>
#include <stdlib.h>
char B[100], *p;
sprintf(B, "%p", malloc(20));
sscanf(B, "%p", (void **)p);

Undefined behaviour. Not a particularly good example in favour of
using casts.

Nov 13 '05 #368
Richard Heathfield <do******@addre ss.co.uk.invali d> wrote in message news:<bn******* ***@hercules.bt internet.com>.. .
P.J. Plauger wrote:

Generally I avoid casts for the reason so often given -- they're so strong
that they often hide problems.

Yes, they do.
We add them where required for correctness,

for portability,

Do you have an example of a cast that is not required for correctness but
which can nevertheless add to the portability of a program?

Assume clock_t is, for a particular implementation, a typedef for
'double'. Then

printf("%g", clock()/CLOCKS_PER_SEC) ;

is correct code for that implementation, but needs to be rewritten as:

printf("%g", (double)clock()/(double)CLOCKS_ PER_SEC);

for portability to other implementations , where clock_t might be, for
instance, an 'int'. Even this more portable form fails in the
techically possible case where clock_t is typedef for an imaginary
type. :-)

Excersize for the student: HOW does it fail? Can it be re-written to
work in all cases?
for C++ compatibility,

I am yet to be persuaded that you need anything other than extern "C" { }
for C++ compatibility.

Examine Annex C of the C++ standard. It's quite possible to write
valid C code that is also valid C++ code, with different meanings.
Using extern "C" is not sufficient to cover those cases.

There's a common misconception that code in an extern "C" block gets
compiled according to the rules of the C language; it does not. An
identifier with external linkage declared as extern "C" is passed to
the linker using C naming conventions. A function or function pointer
whose function type is declared extern "C" uses C interface
conventions. However, the actual code in an extern block gets compiled
using the rules of C++, and can make use of C++ features such as
templates and function overloading (though a function with extern "C"
language linkage cannot itself be part of an overload set).

In particular, for every case listed in Annex C where the C and C++
languages interpret the same valid code differently, it's the C++
interpretation that will be used, which can cause C code to break if
you try to convert it for C++ use just by naively slapping on extern
and to quiet silly warnings.

Wouldn't some kind of warning-processor do the job better? Why pollute the
code with casts that are not required for any other reason, merely to
silence a verbose compiler?

As a general rule, end users would tend to be annoyed if using a
library required them to send the compiler output through a "warning
processor". They might end up deciding to use a different library,
that doesn't impose such a burden.
But allocator casts often *help* us find bugs that arise during
maintenance. The classic pattern is a structure declared here, containing
a pointer to another structure declared somewhere else, for which storage
is allocated there, and freed some other there. That's why we allocate N
times the size of the thing we really want, cast the resultant pointer to
a pointer to that type, and store it in what should be a compatible type
of pointer. We've had the compiler inform us of bugs in both size and
pointer types as the code changes under maintenance and enhancement.

I've tried to follow your English explanation, and I can't see anything
terribly difficult or esoteric about what you're doing that would justify a
malloc cast, so presumably I have misunderstood. Could you give us a
concrete C example instead, please? Thanks.

Let me translate his English; it's pretty straight forward.

#include "somewhere_else .h"
typedef struct
// "... a structure declared here containing a pointer to ..."
their_struct *ptheirs;
// other contents.
} other_struct;
somewhere_else. h:
// " ... a structure declared somewhere else ..."
typedef struct
// contents
} their_struct;

#include "here.h"
// " ... for which storage is allocated there ..."
void there(ourstruct *ours, size_t N)
{ // ".. we allocate N times the size of the thing we really want,
// cast the resultant pointer to a pointer to that type, and store
// it in what should be a compatible type of pointer.
ours->theirs = (their_struct*) malloc(N * sizeof(their_st ruct));

// Other code.

some_other_ther e.c:
#include "here.h"
// " ... and freed some other there ..."
void some_other_ther e(ourstruct *ours)
// Other code

The one problem that can be caught by the cast of the malloc() return
value is a mis-match between the actual type of "ours->theirs" and the
type used in the type cast. The cost of this technique is that it
merely replaces one opportunity for a silent mis-match with a
different opportunity for an equally disastrous silent mis-match.
However, since the cast and the sizeof are both on the same line, they
are much less likely to get out of sync with each other, than either
of them is to get out of sync with the actual type of "ours->theirs".
Nov 13 '05 #369
Sidney Cadot <si****@jigsaw. nl> wrote in message news:<bn******* ***@news.tudelf t.nl>...
Arthur J. O'Dwyer wrote:
On Tue, 21 Oct 2003, Sidney Cadot wrote:
Arthur J. O'Dwyer wrote:
.... N869 section, which describes the order of operations
during the assignment:

malloc() is called, and then returns a (void *).
That (void *) is converted to (double *) and assigned to x.

With the cast, we get:

malloc() is called, and then returns a (void *).
That (void *) is converted to (double *) [and then...]
That (double *) is assigned to x.

Same exact thing. No change in executable; no change in value;
no change in type. Just extra verbiage.

I was thinking in terms of how a compiler would handle this: with
casted-malloc, it first changes the type of the void* to double*, after
which it will go and handle double*-to-double* assignment. with
uncasted-malloc, it will recognise void*-to-double* assigment and then
either directly or indirectly (via an inserted cast) generate the same
code, which is a slightly different execution path for the compiler to take.

Yes, if you change the code that is being parsed, you change the
execution path of the compiler. You also change the execution path of
the compiler by inserting space characters and comments. You also
change it when you replace a type with a typedef, or an expression
with a macro that expands into the same expression.

However, with both the casted and uncasted version of the code, you're
telling the compiler to generate code that does exactly the same
Nov 13 '05 #370

This thread has been closed and replies have been disabled. Please start a new discussion.

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