Hi Patrick,

You wrote to David Burns:

PD> DB> What's VOID used for?  when I make a MAIN routine, does it have to
PD> DB> be VOID?

PD>In my (not very great) experience yes ..

Your lack of experience shows a little later :-(.

PD> DB> will:

PD> DB> main(); { printf("Hello World"); }

PD> DB> work?

PD>No. Because AFAIK every C function must return a value (default being an
PD>int). So the above code really reads.

PD>        int main();   /** the ; should not be there **/
PD>        {
PD>        printf("Hello World");
PD>        };

Correct, this is K&R behaviour though, not ANSI.

PD>In order to make it work you will need something like

PD>        #include

PD>        void main(void)  /** You don't want to return anything or receive
PD>                             anything **/

The "C" standard mandates that main() _always_ returns an int. If you
set it as void main(void) you still return a value to the operating
system, it's now undefined.

Conforming forms of main() are:-

int main (void)                  /* This is the form you want here */
int main (int argc,char *argv[])  /* Use for command line parameters */

You may also find:

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

This form is compiler specific and only supported by some platforms.


PD>        {
PD>        printf("Hello World");

PD>        return;

the return should be:

return EXIT_SUCCESS;

PD>        }

George

 * SLMR 2.1a * Computers eliminate spare time.

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