Re: First Basic Program

Re: First Basic Program

[Dockeen]

Actually I have seen a number of folks argue with
great vitriol that void main() is *really* the right
way, usually based on history and that "life is
different than standards" or the ever favorite,
"programming to standards is industrial and I don't 
teach that in my classroom, and never will"

Wayne

Re: First Basic Program

[Samuel T. Santos]

yeah... My professor is one of that

I prefer follow the standards... and know the possibilities

til next

Sams

Em Ter, 2003-02-25 às 00:11, Dockeen escreveu:
> Actually I have seen a number of folks argue with
> great vitriol that void main() is *really* the right
> way, usually based on history and that "life is
> different than standards" or the ever favorite,
> "programming to standards is industrial and I don't 
> teach that in my classroom, and never will"
> 
> Wayne
> 

Re: First Basic Program

[LLeweLLyn Reese]

"Dockeen" <dockeen@mchsi.com> writes:

> Actually I have seen a number of folks argue with
> great vitriol that void main() is *really* the right
> way, usually based on history

Based on a history that ignores the fact that C originated in unix, an
    OS which expects every program to have an int return value ?

> and that "life is
> different than standards"

In real life, there is a long list of compilers which have never
    accepted 'void main'. One of those compilers is gcc, the topic of
    this list.

> or the ever favorite,
> "programming to standards is industrial and I don't 
> teach that in my classroom, and never will"

And programming to a tradition that originated at an industry giant,
    isn't industrial? (again, people at Microsoft started 'void main'
    before there was a C standard.)

Re: First basic program

[Samuel T. Santos]

hehehhe
yes

'void main(void)'

but we use Turbo C++ 1.01
very very old...

I mean in Visual C++ it use the standard what is define main with int
return.


Em Seg, 2003-02-24 às 23:23, LLeweLLyn Reese escreveu:
> "Samuel T. Santos" <soujavatambem@uol.com.br> writes:
> 
> > ah...
> > 
> > Well... in Visual C++ the standard is int I think...
> >
> > but its I learn in the college...
> 
> Your college teaches 'void main()' ?
> 
> *shiver*
> 
> 

Re: First basic program

[LLeweLLyn Reese]

"Samuel T. Santos" <soujavatambem@uol.com.br> writes:

> ah...
> 
> Well... in Visual C++ the standard is int I think...
>
> but its I learn in the college...

Your college teaches 'void main()' ?

*shiver*

Re: First Basic Program

[Samuel T. Santos]

hmmm...

i got it.
thanks!

Sams

-> heheheh I know... it save me many times, but to reduce time... I ask,
and to confort too, but I will search!... :)

Em Seg, 2003-02-24 às 21:49, Dockeen escreveu:
> "where I found the ISO C++ Standard and ISO C Standard?"
> 
> You can google for the draft standard.  The real standard
> costs money.  
> 
> By the way, you do understand that the quote I gave you is
> from the originator of the C++ language.
> 
> Wayne
> 
> p.s. Google is our friend, many of the questions you are
> asking can be found there....
> 
> www.google.com
> 
> through google I found:
> 
> http://www.csci.csusb.edu/dick/c++std/
> 
> 

Re: First Basic Program

[Dockeen]

"where I found the ISO C++ Standard and ISO C Standard?"

You can google for the draft standard.  The real standard
costs money.  

By the way, you do understand that the quote I gave you is
from the originator of the C++ language.

Wayne

p.s. Google is our friend, many of the questions you are
asking can be found there....

www.google.com

through google I found:

http://www.csci.csusb.edu/dick/c++std/

Re: First Basic Program

[Samuel T. Santos]

Thanks

its very useful!

Sams

Em Seg, 2003-02-24 às 20:57, Dockeen escreveu:
> Google is our friend!  I just went to google, searched on gcc simple
> compile example and I found this:
> 
> http://galton.uchicago.edu/~gosset/Compdocs/gcc.html
> 
> Wayne
> 

Re: First basic program

[Samuel T. Santos]

Its interesting... 
Its eliminate any doubt. :)

for curiosity... where I found the ISO C++ Standard and ISO C Standard?

thanks for the link!

Em Seg, 2003-02-24 às 01:31, Dockeen escreveu:
> Here is a quote from a page from Bjarne that might 
> be of some interest on the main returning an int front...
> 
> 
> "Can I write "void main()"?
> The definition 
> 	void main() { /* ... */ }
> 
> is not and never has been C++, nor has it even been C. See the 
> ISO C++ standard 3.6.1[2] or the ISO C standard 5.1.2.2.1. 
> A conforming implementation accepts 
> 	int main() { /* ... */ }
> 
> and 
> 	int main(int argc, char* argv[]) { /* ... */ }
> 
> A conforming implementation may provide more versions of main(), 
> but they must all have return type int. The int returned by main() 
> is a way for a program to return a value to "the system" that 
> invokes it. On systems that doesn't provide such a facility the 
> return value is ignored, but that doesn't make "void main()" 
> legal C++ or legal C. Even if your compiler accepts "void main()" 
> avoid it, or risk being considered ignorant by C and C++ programmers.
> 
> The quote comes from here:
> 
> http://www.research.att.com/~bs/bs_faq2.html#void-main 
> 
> Wayne 
> 

Re: First basic program

[Samuel T. Santos]

ah...

Well... in Visual C++ the standard is int I think...

but its I learn in the college...


Em Seg, 2003-02-24 às 17:56, LLeweLLyn Reese escreveu:
> bjorn rohde jensen <bjensen@fastmail.fm> writes:
> 
> > Hi there,
> > 
> >   Opinions differ,
> 
> The opinions of the C (89,95,99) and C++ standards have always been
>     the same: main must return int.
> 
> 'void main()' first came out of Microsoft before the first C standard
>     was finalized in 1988. Why it continues to come out of Microsoft
>     is beyond me; perhaps their coding standards are still in the
>     80s. :-)
> 
> > but it has always been my understanding
> > that main should be declared as returning int:) gcc seems
> > to think so too.
> 
> Correct.
> 
> [Other correcct stuff about a.out snipped.]

Re: First Basic Program

[Dockeen]

Google is our friend!  I just went to google, searched on gcc simple
compile example and I found this:

http://galton.uchicago.edu/~gosset/Compdocs/gcc.html

Wayne

Re: First basic program

[LLeweLLyn Reese]

bjorn rohde jensen <bjensen@fastmail.fm> writes:

> Hi there,
> 
>   Opinions differ,

The opinions of the C (89,95,99) and C++ standards have always been
    the same: main must return int.

'void main()' first came out of Microsoft before the first C standard
    was finalized in 1988. Why it continues to come out of Microsoft
    is beyond me; perhaps their coding standards are still in the
    80s. :-)

> but it has always been my understanding
> that main should be declared as returning int:) gcc seems
> to think so too.

Correct.

[Other correcct stuff about a.out snipped.]

First basic program

[Samuel T. Santos]

Hello guys!

I run my first program using GCC for Linux! the basic but not boring
Hello World! hehehe

I create a file with VI editor and I wrote the code
and to compile I use "gcc HelloWorld.c"

to messages was show:

HelloWorld.c: In function `main':
HelloWorld.c:4: warning: return type of `main' is not `int

and the Gcc compiler create a file call "a.out*"

My doubts are: 
	First: to declare the main function I must use the type "int"?

	Second: Why GCC create a file call "a.out*"? Why the file call
"HelloWorld*"? How I do that? Its don't generate some intermediate file?

	Third: What the common options I use to compile a program?

	Fourth: Where I look to see all functions available by GCC?

I use Mandrake 9.0

my code was that:

#include <stdio.h>

void main(void)
{
	printf("\t\t\t Helllllooo LINUX World!!\n");
}


til next! :)

	Sams

Re: First basic program

[Dockeen]

Here is a quote from a page from Bjarne that might 
be of some interest on the main returning an int front...


"Can I write "void main()"?
The definition 
	void main() { /* ... */ }

is not and never has been C++, nor has it even been C. See the 
ISO C++ standard 3.6.1[2] or the ISO C standard 5.1.2.2.1. 
A conforming implementation accepts 
	int main() { /* ... */ }

and 
	int main(int argc, char* argv[]) { /* ... */ }

A conforming implementation may provide more versions of main(), 
but they must all have return type int. The int returned by main() 
is a way for a program to return a value to "the system" that 
invokes it. On systems that doesn't provide such a facility the 
return value is ignored, but that doesn't make "void main()" 
legal C++ or legal C. Even if your compiler accepts "void main()" 
avoid it, or risk being considered ignorant by C and C++ programmers.

The quote comes from here:

http://www.research.att.com/~bs/bs_faq2.html#void-main 

Wayne 

Re: First basic program

[Samuel T. Santos]

then its a padronization of GCC to declare return type of main a int

I will read them!

thanks! 

til more

Em Dom, 2003-02-23 às 17:56, bjorn rohde jensen escreveu:
> Hi there,
> 
>   Opinions differ, but it has always been my understanding
> that main should be declared as returning int:) gcc seems
> to think so too.
>   The reason, you get a file by the name "a.out", is simply,
> that you have not told gcc to call it anything, so it uses
> the traditional default. You should be aware, that creating
> an executable conceptually involves 2 steps; the generation
> of a number of object files from their source .c files, and
> secondly the linking of the object files with various libraries
> to form the executable. In your case, gcc does both.
>   Some commonly used options to gcc are; -ansi -pedantic -Wall
> -O3, -c and -o. The first 3 are to get gcc to check/warn about
> a lot of possible mistakes, which might technically be legal,
> but unlikely to be the intention and to reject programs using
> platform specific extensions for better portability. The others
> and plenty more, you can read all about in the nice man pages
> for gcc:)
> 
> Yours sincerely,
> 
> Bjorn
> 

Re: First basic program

[bjorn rohde jensen]

Hi there,

  Opinions differ, but it has always been my understanding
that main should be declared as returning int:) gcc seems
to think so too.
  The reason, you get a file by the name "a.out", is simply,
that you have not told gcc to call it anything, so it uses
the traditional default. You should be aware, that creating
an executable conceptually involves 2 steps; the generation
of a number of object files from their source .c files, and
secondly the linking of the object files with various libraries
to form the executable. In your case, gcc does both.
  Some commonly used options to gcc are; -ansi -pedantic -Wall
-O3, -c and -o. The first 3 are to get gcc to check/warn about
a lot of possible mistakes, which might technically be legal,
but unlikely to be the intention and to reject programs using
platform specific extensions for better portability. The others
and plenty more, you can read all about in the nice man pages
for gcc:)

Yours sincerely,

Bjorn

Re: First basic program

[Samuel T. Santos]

Hello guys!

I run my first program using GCC for Linux! the basic but not boring
Hello World! hehehe

I create a file with VI editor and I wrote the code
and to compile I use "gcc HelloWorld.c"

to messages was show:

HelloWorld.c: In function `main':
HelloWorld.c:4: warning: return type of `main' is not `int

and the Gcc compiler create a file call "a.out*"

My doubts are:
	First: to declare the main function I must use the type "int"?

	Second: Why GCC create a file call "a.out*"? Why the file call
"HelloWorld*"? How I do that? Its don't generate some intermediate file?

	Third: What the common options I use to compile a program?

	Fourth(and more important): Where I look to see all functions available
by GCC?

I use Mandrake 9.0

my code was that:

#include <stdio.h>

void main(void)
{
	printf("\t\t\t Helllllooo LINUX World!!\n");
}


til next! :)

	Sams