dev-cpp-users

[Dev-C++] A simple problem

[<par...@ya...>]

Can Anyone tell me why this code WORKS FINE in DevC++? 
ANSI C says that it any Ansi compiler should give you an error (see K&R
book).
Thank you very much!
Paul

-----------------------------------------------------------
main ()
{
  printf("hello, world
  \n
  
  
  ");
  system("PAUSE");	
}

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Re: [Dev-C++] A simple problem

[Arnvid K. <ar...@ka...>]

On Tue, 19 Nov 2002 11:47:21 +0000 (GMT) - Paul Ardeleanu <par...@ya...> wrote:

> Can Anyone tell me why this code WORKS FINE in DevC++? 
> ANSI C says that it any Ansi compiler should give you an error (see K&R
> book).
> Thank you very much!
> Paul
> 
> -----------------------------------------------------------
> main ()
> {
>   printf("hello, world
>   \n
>   
>   
>   ");
>   system("PAUSE");	
> }

A good thing in c is always to do a 

  return 0;

before the last }  in main... gcc and many other compilers complain if
you don't. so keep the compilers happy ;)

Re: [Dev-C++] A simple problem

[Brenden T. <br...@rc...>]

Newlines are illegal in string constants, according to K&R.  It's a bug, 
you should reported to the DevCpp folks.

Paul Ardeleanu wrote:

>Can Anyone tell me why this code WORKS FINE in DevC++? 
>ANSI C says that it any Ansi compiler should give you an error (see K&R
>book).
>Thank you very much!
>Paul
>
>-----------------------------------------------------------
>main ()
>{
>  printf("hello, world
>  \n
>  
>  
>  ");
>  system("PAUSE");	
>}
>
>__________________________________________________
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Re: [Dev-C++] A simple problem

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

Hi problem hunters!

Tuesday, November 19, 2002, 7:37:32 PM, Brenden wrote:

BT> Newlines are illegal in string constants, according to K&R.  It's a bug, 
BT> you should reported to the DevCpp folks.

Well,  first  of  all  the  compiler has nothing to do with the DevCpp
developers.  The  compiler that DevCpp uses, is the Minimalist GNU for
Windows  (MinGW).  It  uses  the  GNU  Compiler  Collection  (gcc) for
compiling. Take a look at http://www.mingw.org for details.

>>main ()
>>{
>>  printf("hello, world
>>  \n
>>  
>>  
>>  ");
>>  system("PAUSE");     
>>}

The reason why this works, is this:

"
 Using the GNU Compiler Collection:
 
 String Literals with Embedded Newlines

 As  an  extension,  GNU  CPP permits string literals to cross multiple
 lines without escaping the embedded newlines. Each embedded newline is
 replaced with a single `\n' character in the resulting string literal,
 regardless  of  what  form  the newline took originally.
 
 CPP  currently  allows  such strings in directives as well (other than
 the  `#include'  family).  This  is  deprecated and will eventually be
 removed.
"

As you could read, it is DEPRECATED. GCC 3.2 (what I have installed) gives
the following warning for the program (older ones don't):

    warning: multi-line string literals are deprecated

Look at: http://gcc.gnu.org/onlinedocs/gcc-3.2/gcc/
and search for "String Literals with Embedded Newlines".

-- 
Best regards,
 Oroszi Balázs                     mailto:or...@vp...

PGP-FP: FB80 8A43 2664 6126 E465  46E2 2546 CFA3 C25B 9F70
finger -l or...@se... 

Re: [Dev-C++] A simple problem

[Brenden T. <br...@rc...>]

Oroszi Balázs wrote:

>Well,  first  of  all  the  compiler has nothing to do with the DevCpp
>developers.  
>

Duoh!  I keep forgetin' that.

>As you could read, it is DEPRECATED. GCC 3.2 
>

Good, so the GCC guys know about it, and it's being worked on.  Problem 
solved, I'd say.

TTFN!

RE: [Dev-C++] A simple problem

[Ioannis V. <no...@ho...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Paul Ardeleanu
> Sent: Tuesday, November 19, 2002 1:47 PM
> To: dev...@li...
> Subject: [Dev-C++] A simple problem
> 
> 
> Can Anyone tell me why this code WORKS FINE in DevC++? 
> ANSI C says that it any Ansi compiler should give you an 
> error (see K&R
> book).
> Thank you very much!
> Paul
> 
> -----------------------------------------------------------
> main ()
> {
>   printf("hello, world
>   \n
>   
>   
>   ");
>   system("PAUSE");	
> }


It is valid C90 code (and not C99).

The main() thing is implicit int. In C90 you could do:


const x=7;

and it was equivallent to const int x=7;


main() was equivallent to int main(). This is not the case in C99.


Now both in C90 and C99 if you do not declare a function and you use it,
a declaration of the type


int whatever_you_use(); is assumed. The empty parenthesis is not
equivallent to (void) as in C++. Empty parenthesis means that you want
to skip argument checking.


So when you use printf() without <stdio.h>, int printf(); is assumed.


Ioannis Vranos
 
* Programming pages: http://www.noicys.freeurl.com
* Alternative URL: http://run.to/noicys

RE: [Dev-C++] A simple problem

[<par...@ya...>]

Ioannis,
I was talking about printf on multiple lines. Kala? :)
Paul

 --- Ioannis Vranos <no...@ho...> wrote: > > -----Original
Message-----
> > From: dev...@li... 
> > [mailto:dev...@li...] On Behalf 
> > Of Paul Ardeleanu
> > Sent: Tuesday, November 19, 2002 1:47 PM
> > To: dev...@li...
> > Subject: [Dev-C++] A simple problem
> > 
> > 
> > Can Anyone tell me why this code WORKS FINE in DevC++? 
> > ANSI C says that it any Ansi compiler should give you an 
> > error (see K&R
> > book).
> > Thank you very much!
> > Paul
> > 
> > -----------------------------------------------------------
> > main ()
> > {
> >   printf("hello, world
> >   \n
> >   
> >   
> >   ");
> >   system("PAUSE");	
> > }
> 
> 
> It is valid C90 code (and not C99).
> 
> The main() thing is implicit int. In C90 you could do:
> 
> 
> const x=7;
> 
> and it was equivallent to const int x=7;
> 
> 
> main() was equivallent to int main(). This is not the case in C99.
> 
> 
> Now both in C90 and C99 if you do not declare a function and you use it,
> a declaration of the type
> 
> 
> int whatever_you_use(); is assumed. The empty parenthesis is not
> equivallent to (void) as in C++. Empty parenthesis means that you want
> to skip argument checking.
> 
> 
> So when you use printf() without <stdio.h>, int printf(); is assumed.
> 
> 
> Ioannis Vranos
>  
> * Programming pages: http://www.noicys.freeurl.com
> * Alternative URL: http://run.to/noicys
> 
> 
> 
> 
> -------------------------------------------------------
> This sf.net email is sponsored by: To learn the basics of securing 
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Re: [Dev-C++] A simple problem

[Luigi S. <gi...@li...>]

On Tue, Nov 19, 2002 at 11:47:21AM +0000, Paul Ardeleanu wrote:
> Can Anyone tell me why this code WORKS FINE in DevC++? 
> ...
> -----------------------------------------------------------
> main ()
> {
>   printf("hello, world
>   \n
>   
>   
>   ");
> ...

Try adding the options "-ansi -pedantic" and you'll see that 
the compiler complains about strings extending past the end
of a line.

If you replace "-pedantic" by "-pedantic-errors", the compiler
will refuse to generate object file.

-- 
>> gisan >>
Q:	Why did Menachem Begin invade Lebanon?
A:	To impress Jodie Foster.

Re: [Dev-C++] A simple problem

[<par...@ya...>]

Is there any place where all these options are explain?
Thanks!
Paul

 --- Luigi Santillo <gi...@li...> wrote:
> Try adding the options "-ansi -pedantic" and you'll see that 
> the compiler complains about strings extending past the end
> of a line.
> 
> If you replace "-pedantic" by "-pedantic-errors", the compiler
> will refuse to generate object file.

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RE: [Dev-C++] A simple problem

[Ioannis V. <no...@ho...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Paul Ardeleanu
> Sent: Thursday, November 21, 2002 8:38 PM
> To: dev...@li...
> Subject: Re: [Dev-C++] A simple problem
> 
> 
> Is there any place where all these options are explain?
> Thanks!


http://gcc.gnu.org at the documentation area.


Ioannis Vranos
 
* Programming pages: http://www.noicys.freeurl.com
* Alternative URL: http://run.to/noicys