difference for array in c and c++?

[anto frank]

hi friends,
is ther any difference in array in c and array in c++?

[Richard Heathfield]

user923005 said:

On Sep 24, 11:20 pm, anto frank <j.antofrank... @gmail.comwrote :

>hi friends,
is ther any difference in array in c and array in c++?

Sure, if it's an array of objects.

In both C and C++, there's no other kind of array than an array of objects
(in the C sense of the word, which is also as near as makes no odds the
C++ sense of the word).

<snip>

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

[Ian Collins]

user923005 wrote:

On Sep 24, 11:20 pm, anto frank <j.antofrank... @gmail.comwrote :

>hi friends,
is ther any difference in array in c and array in c++?

Sure, if it's an array of objects.

Only if those are C++ types, if the code compiles as C, there isn't any
difference.

--
Ian Collins.

[user923005]

On Sep 25, 12:21 am, Ian Collins <[e-mail] mwrote:

user923005 wrote:

On Sep 24, 11:20 pm, anto frank <j.antofrank... @gmail.comwrote :

hi friends,
is ther any difference in array in c and array in c++?

Sure, if it's an array of objects.

Only if those are C++ types, if the code compiles as C, there isn't any
difference.

Besides the difference for allocated memory management, the public
symbol names can also be different. C++ data types can be decorated
with name mangling stuff. So if you link to a public symbol compiled
in C and your program is C++ you may have to define the linkage with
extern "C".

[user923005]

On Sep 25, 12:06 am, Richard Heathfield <[e-mail].i nvalidwrote:

user923005 said:

On Sep 24, 11:20 pm, anto frank <j.antofrank... @gmail.comwrote :

hi friends,
is ther any difference in array in c and array in c++?

Sure, if it's an array of objects.

In both C and C++, there's no other kind of array than an array of objects
(in the C sense of the word, which is also as near as makes no odds the
C++ sense of the word).

<snip>

In C++ the array operator [] can be overloaded to mean something
completely different than what it means in C.

[Ian Collins]

user923005 wrote:

On Sep 25, 12:21 am, Ian Collins <[e-mail] mwrote:

>user923005 wrote:

>>On Sep 24, 11:20 pm, anto frank <j.antofrank... @gmail.comwrote :
hi friends,
is ther any difference in array in c and array in c++?
Sure, if it's an array of objects.

Only if those are C++ types, if the code compiles as C, there isn't any
difference.

Besides the difference for allocated memory management, the public
symbol names can also be different. C++ data types can be decorated
with name mangling stuff. So if you link to a public symbol compiled
in C and your program is C++ you may have to define the linkage with
extern "C".

There need not be any difference for allocated memory management, malloc
works in C++. Name mangling applies to functions, not arrays.

I think the OP was asking about behavior of arrays, not the objects
stored in them, or how the memory they use is allocated.

--
Ian Collins.

[Richard Heathfield]

user923005 said:

On Sep 25, 12:06 am, Richard Heathfield <[e-mail].i nvalidwrote:

>user923005 said:

On Sep 24, 11:20 pm, anto frank <j.antofrank... @gmail.comwrote :
hi friends,
is ther any difference in array in c and array in c++?

Sure, if it's an array of objects.

In both C and C++, there's no other kind of array than an array of
objects (in the C sense of the word, which is also as near as makes no
odds the C++ sense of the word).

<snip>

In C++ the array operator [] can be overloaded to mean something
completely different than what it means in C.

Of course, but that doesn't change the nature of arrays. It merely changes
the nature of the [] operator. And my point remains - that *all* arrays,
in both C and C++, are arrays of objects. So to say "if it's an array of
objects" is tautologically and redundantly superfluous.

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

[user923005]

On Sep 25, 1:37 am, Ian Collins <[e-mail] mwrote:

user923005 wrote:

On Sep 25, 12:21 am, Ian Collins <[e-mail] mwrote:

user923005 wrote:
On Sep 24, 11:20 pm, anto frank <j.antofrank... @gmail.comwrote :
hi friends,
is ther any difference in array in c and array in c++?
Sure, if it's an array of objects.
Only if those are C++ types, if the code compiles as C, there isn't any
difference.

Besides the difference for allocated memory management, the public
symbol names can also be different. C++ data types can be decorated
with name mangling stuff. So if you link to a public symbol compiled
in C and your program is C++ you may have to define the linkage with
extern "C".

There need not be any difference for allocated memory management, malloc
works in C++. Name mangling applies to functions, not arrays.

I think the OP was asking about behavior of arrays, not the objects
stored in them, or how the memory they use is allocated.

C:\tmp>cl test.c t.cpp
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762
for 80x86
Copyright (C) Microsoft Corporation. All rights reserved.

test.c
Generating Code...
Compiling...
t.cpp
Generating Code...
Microsoft (R) Incremental Linker Version 8.00.50727.762
Copyright (C) Microsoft Corporation. All rights reserved.

/out:test.exe
test.obj
t.obj
test.obj : error LNK2019: unresolved external symbol _uiCpp referenced
in function _main
test.exe : fatal error LNK1120: 1 unresolved externals

C:\tmp>type test.c
#include <stdio.h>

extern unsigned int uiCpp[4];

int main(void)
{
printf("uiCpp[0] = %u\n", uiCpp[0]);
return 0;
}

C:\tmp>type t.cpp
unsigned int uiCpp[4] = {1};

C:\tmp>ren t.cpp t.c

C:\tmp>cl test.c t.c
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762
for 80x86
Copyright (C) Microsoft Corporation. All rights reserved.

test.c
t.c
Generating Code...
Microsoft (R) Incremental Linker Version 8.00.50727.762
Copyright (C) Microsoft Corporation. All rights reserved.

/out:test.exe
test.obj
t.obj

C:\tmp>

[Martin Wells]

anto_frank:

hi friends,
is ther any difference in array in c and array in c++?

I program in both languages are there's no suprises when it comes to
arrays.

There's a good page on the web that has a finite list of all the
differences between C and C++ when it comes to their common subset...
can't remember the URL though, try Google for something like
"Difference s C C++". Off the top of my head, here's a few of the
differences:

1: Character literals are int in C, char in C++.
2: Global variable are static in C, extern in C++ (...if I remember
correctly)

Martin

[user923005]

On Sep 25, 1:58 am, Richard Heathfield <[e-mail].i nvalidwrote:

user923005 said:

On Sep 25, 12:06 am, Richard Heathfield <[e-mail].i nvalidwrote:

user923005 said:

On Sep 24, 11:20 pm, anto frank <j.antofrank... @gmail.comwrote :
hi friends,
is ther any difference in array in c and array in c++?

Sure, if it's an array of objects.

In both C and C++, there's no other kind of array than an array of
objects (in the C sense of the word, which is also as near as makes no
odds the C++ sense of the word).

<snip>

In C++ the array operator [] can be overloaded to mean something
completely different than what it means in C.

Of course, but that doesn't change the nature of arrays. It merely changes
the nature of the [] operator. And my point remains - that *all* arrays,
in both C and C++, are arrays of objects. So to say "if it's an array of
objects" is tautologically and redundantly superfluous.

My point was that you should not count on a C++ array behaving like a
C array (it may or may not behave in a similar way). The objects in C+
+ are also (generally) quite different than C objects, which do not
have constructors or destructors.

Assigning an object to an array can have a very different meaning for
a struct, for instance.
In C++, the struct can have a constructor, and in C it cannot.
In short, there are subtle and important differences between arrays in
C and C++.
They are not the same.
C:\tmp\p\new>cl t.cpp
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762
for 80x86
Copyright (C) Microsoft Corporation. All rights reserved.

t.cpp
Microsoft (R) Incremental Linker Version 8.00.50727.762
Copyright (C) Microsoft Corporation. All rights reserved.

/out:t.exe
t.obj

C:\tmp\p\new>t
arr[2].a=5, arr[2].b=5,arr[2].x=3.571429

C:\tmp\p\new>ty pe t.cpp
#include <stdio.h>

struct foo {
int a;
int b;
double x;
foo() {
a = 5;
b = 5;
x = (a * b) / 7.0;
}
};

int main()
{
struct foo arr[10];
printf("arr[2].a=%d, arr[2].b=%d,arr[2].x=%f\n", arr[2].a,
arr[2].b, arr[2].x);
return 0;
}