what is the difference between string.h and cstring?

[Xiaoshen Li]

Dear All,

I saw some people using
#include <string.h>

some people using
#include <cstring>

What is the difference between the two? I can find the file string.h at
/usr/include. I don't know if cstring is a file and if so, where to find it.

It seems that there are also other similar things, like:
#include <math.h>

#include <cmath> (?? I am not really sure.)

Thank you very much.

[Keith Thompson]

Re: what is the difference between string.h and cstring?

Xiaoshen Li <xli6@gmu.edu > writes:[color=blue]
> I saw some people using
> #include <string.h>
>
> some people using
> #include <cstring>
>
> What is the difference between the two? I can find the file string.h
> at /usr/include. I don't know if cstring is a file and if so, where to
> find it.[/color]

<string.h> is C; <cstring> is C++.

I *think* both forms are legal in C++, but I don't know the details;
try comp.lang.c++ (but check their FAQ first).

--
Keith Thompson (The_Other_Keit h) kst-u@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.

[Martin Ambuhl]

Re: what is the difference between string.h and cstring?

Xiaoshen Li wrote:[color=blue]
> Dear All,
>
> I saw some people using
> #include <string.h>[/color]

This is the standard C header.
[color=blue]
> some people using
> #include <cstring>[/color]

This is a C++ header and has no defined meaning in C.[color=blue]
>
> What is the difference between the two?[/color]

See above.

[Lew Pitcher]

Re: what is the difference between string.h and cstring?

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Xiaoshen Li wrote:[color=blue]
> Dear All,
>
> I saw some people using
> #include <string.h>[/color]

Then, they were probably writing programs in the C programming language
[color=blue]
> some people using
> #include <cstring>[/color]

And, these people were probably writing programs in the C++ programming language.
[color=blue]
> What is the difference between the two?[/color]

One (string.h) is an include file for C, and is on-topic in comp.lang.c

The other (cstring) presumably is an analogous file for C++, and is off-topic in
comp.lang.c



- --
Lew Pitcher
IT Specialist, Enterprise Data Systems,
Enterprise Technology Solutions, TD Bank Financial Group

(Opinions expressed are my own, not my employers')
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[Dominik Wallner]

Re: what is the difference between string.h and cstring?

Xiaoshen Li wrote:[color=blue]
> Dear All,
>
> I saw some people using
> #include <string.h>
>
> some people using
> #include <cstring>
>
> What is the difference between the two? I can find the file string.h at
> /usr/include. I don't know if cstring is a file and if so, where to find
> it.
>
> It seems that there are also other similar things, like:
> #include <math.h>
>
> #include <cmath> (?? I am not really sure.)
>
> Thank you very much.
>[/color]

Yes, <xxx.h> is the C header (which also works for C++, though), and
<cxxx> is the corresponding C++ header file; the difference between
those both is that all the definitions of <cxxx> are in the C++
namespace std (like the STL), whereas <xxx.h> defines no namespace at all.

Regards,
Dominik Wallner

[Default User]

Re: what is the difference between string.h and cstring?

Keith Thompson wrote:

[color=blue]
> <string.h> is C; <cstring> is C++.
>
> I think both forms are legal in C++, but I don't know the details;
> try comp.lang.c++ (but check their FAQ first).[/color]

<OT>

<string.h> is standard but deprecated in C++.

</OT>



Brian

[Michael Mair]

Re: what is the difference between string.h and cstring?

Dominik Wallner wrote:[color=blue]
> Xiaoshen Li wrote:
>[color=green]
>> Dear All,
>>
>> I saw some people using
>> #include <string.h>
>>
>> some people using
>> #include <cstring>
>>
>> What is the difference between the two? I can find the file string.h
>> at /usr/include. I don't know if cstring is a file and if so, where to
>> find it.
>>
>> It seems that there are also other similar things, like:
>> #include <math.h>
>>
>> #include <cmath> (?? I am not really sure.)[/color]
>
> Yes, <xxx.h> is the C header (which also works for C++, though), and
> <cxxx> is the corresponding C++ header file; the difference between
> those both is that all the definitions of <cxxx> are in the C++
> namespace std (like the STL), whereas <xxx.h> defines no namespace at all.[/color]

Please stay on topic; if you give off-topic information, there
may be no one to correct potential errors. In this case, you omitted
that <xxx.h> is deprecated since the 1998 C++ standard -- this may be
helpful for the OP when deciding which variant to use in C++.
Rather direct off-topic requests to the appropriate newsgroup.


Cheers
Michael
--
E-Mail: Mine is an /at/ gmx /dot/ de address.