void main(), int main(), argc, argv[]????

I read somewhere it is good etiquette to use int main().....I understand that 'argc' is the number of parameters handed to main(), and 'argv[]' is an array of char pointers to the parameters.......but am still a little confused.
Am currently learning C, have written some pretty wicked programs, and about to send them in to be marked. All the example code I have ever seen used void main(). My programs work ok with void main(), but if int main() is the standard I want to use it.

Do programs written for industry always use argc & argv[]?
Does this mean the programs must be loaded from the command line?
Should argc & argv[] be tested in some way?
Can int main() be used without argc & argv[]?
What is the difference?
Do you know of a good web site to explain all this for me???

as for the int main v void main issue !read!

>I read somewhere it is good etiquette to use int main().....
No, it is correct to use int main, anything else is just plain wrong.

>My programs work ok with void main()
Maybe for you on your system, but using void main might reformat my hard drive or fry some poor guy's monitor.

>but if int main() is the standard I want to use it.
And this is why I still have hope for the future of programming :)

>Do programs written for industry always use argc & argv[]?
No

>Does this mean the programs must be loaded from the command line?
No

>Should argc & argv[] be tested in some way?
Why should you test values? The user is an intelligent person who always uses the program in the way it should be used, right?

>Can int main() be used without argc & argv[]?
Yes, the other standard way of using main is
int main ( void )

>What is the difference?
What is the difference between
int function ( void )
and
int function ( int i )
One takes arguments that can be used in the function, the other does not.

>Do you know of a good web site to explain all this for me???
If you'll read this line and then look down a few lines.


No, a few more.


Just a couple more you'll see two links in my signature, one is a C FAQ with your answers.

-Prelude

Always use

Code:

---

int main(void)
{

  /* CODE */

  return 0;
}

---

or

Code:

---

int main(int argc, char *argv[])
{

  /* CODE */

  return 0;
}

---

it´s absolutely correct and standard-conform.

klausi