dev-cpp-users

[Dev-C++] need some explanation

[Vlada D. <dj...@im...>]

Hi, everybody
I hope someone can explain this to me. When I write this:

#include <iostream>
#include <stdlib>

using namespace std;

I get error like "stdlib: No such file or directory".
When I write  like this:
#include <iostream>
#include <stdlib.h>

using namespace std;

everything is fine. I thought that with "using namespace" you don't have
specify file extension. Why does the compiler complain only about stdlib
without .h? Can somebody please explain this?
------------
Vlada

Re: [Dev-C++] need some explanation

[Teodorescu C. <te...@xt...>]

Vlada Djurovic wrote:

>Hi, everybody
>I hope someone can explain this to me. When I write this:
>
>#include <iostream>
>#include <stdlib>
>
>using namespace std;
>
>I get error like "stdlib: No such file or directory".
>When I write  like this:
>#include <iostream>
>#include <stdlib.h>
>
>using namespace std;
>
>everything is fine. I thought that with "using namespace" you don't have
>specify file extension. Why does the compiler complain only about stdlib
>without .h? Can somebody please explain this?
>  
>
In c++ you have libraries like <iostream> old name was <iostream.h> and 
in C++ 98 standard was renamed.
on the other hand stdlib.h is not a c++ standard library is a C standard 
so his name remains the same because C standard has .h names
In other words :
    iostream is a C++ stadard library
    stdlib.h is a C standard library
becarefull at string
    <string> contains class string
    <string.h> contains C like functions for manipulating strings
My sugestions:
    1:Use only one set of libreries like either from C++ or from C never 
mixed up especialy when you use pointers.
    2:Take a look at a C++ standard and the diff betwen C and C++

Re: [Dev-C++] need some explanation

[Vlada D. <dj...@im...>]

I'd like to thank everybody for help. You're great, thanks!

----- Original Message ----- 
From: "Teodorescu Cristian" <te...@xt...>
To: "Dev-C++ Mailing List" <dev...@li...>
Sent: Wednesday, September 25, 2002 10:07 AM
Subject: Re: [Dev-C++] need some explanation


> Vlada Djurovic wrote:
> 
> >Hi, everybody
> >I hope someone can explain this to me. When I write this:
> >
> >#include <iostream>
> >#include <stdlib>
> >
> >using namespace std;
> >
> >I get error like "stdlib: No such file or directory".
> >When I write  like this:
> >#include <iostream>
> >#include <stdlib.h>
> >
> >using namespace std;
> >
> >everything is fine. I thought that with "using namespace" you don't have
> >specify file extension. Why does the compiler complain only about stdlib
> >without .h? Can somebody please explain this?
> >  
> >
> In c++ you have libraries like <iostream> old name was <iostream.h> and 
> in C++ 98 standard was renamed.
> on the other hand stdlib.h is not a c++ standard library is a C standard 
> so his name remains the same because C standard has .h names
> In other words :
>     iostream is a C++ stadard library
>     stdlib.h is a C standard library
> becarefull at string
>     <string> contains class string
>     <string.h> contains C like functions for manipulating strings
> My sugestions:
>     1:Use only one set of libreries like either from C++ or from C never 
> mixed up especialy when you use pointers.
>     2:Take a look at a C++ standard and the diff betwen C and C++
> 
> 
> 
> 
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Re: [Dev-C++] need some explanation

[<ri...@te...>]

Vlada Djurovic escribió:

>Hi, everybody
>I hope someone can explain this to me. When I write this:
>
>#include <iostream>
>#include <stdlib>
>
>using namespace std;
>
>I get error like "stdlib: No such file or directory".
>When I write  like this:
>#include <iostream>
>#include <stdlib.h>
>
>using namespace std;
>
>everything is fine. I thought that with "using namespace" you don't have
>specify file extension. Why does the compiler complain only about stdlib
>without .h? Can somebody please explain this?
>------------
>Vlada
>
>  
>
The namespaces are used for STL (Standard Template Library) but stdlib.h 
it´s a header for C library:
In a nut shell:
    If you use the standard C  library you must put .h for including headers
    If you use STL you must not use .h and also type 'using namespace stl'

Cheers

Re: [Dev-C++] need some explanation

[<or...@vp...>]

Vlada Djurovic wrote:
> #include <iostream>
> #include <stdlib>
> using namespace std;
> I get error like "stdlib: No such file or directory".
 >
> When I write  like this:
> #include <iostream>
> #include <stdlib.h>
> using namespace std;
 >
> everything is fine. I thought that with "using namespace" you don't have
> specify file extension.
No, I think this is not correct this way.
I would rather say: when you don't use extensions, you MUST use namespaces.

> Why does the compiler complain only about stdlib
> without .h? Can somebody please explain this?
The compiler complains, because there is no "stdlib" file. "stdlib.h" 
instead is part of C, not C++. If you look into 
<MINGW_DIR>/include/c++/3.2 you won't find any stdlib or stdlib.h files. 
It is in /include.

Another little note:
If you look into
<MINGW_DIR>/include/c++/3.2
you will notice, that the files there don't have extensions. They have 
namespaces. But in
<MINGW_DIR>/include/c++/3.2/backward
they have extensions (kept for backward compatibility).

--
Greetings,
   Balázs

Re: [Dev-C++] need some explanation

[iad929 <ia...@jo...>]

> #include <iostream>
> #include <stdlib>
> 

#include <cstdlib>

Mohammed