From:	"John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: printf() and shl Questions
Date:	Sun, 29 Jun 1997 19:53:33 +0000
Organization:	Two pounds of chaos and a pinch of salt
Lines:	29
Message-ID:	<33B6BD3D.3622@cs.com>
References:	<33B59082 DOT F71 AT sandiegoca DOT ncr DOT com>
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Justin Talbot wrote:
> 
> Two problems:
> 
> First if I compile and run a simple program:
> void main(void)

That is incorrect.  main() must return an integer according to the ANSI
standard.  Declaring it as void may cause undefined behavior.

> {
>         printf("Hello world");
>         getch();
> }

stdio and conio functions use the screen and console differently. 
stdout is line-buffered, so you don't see anything on the screen until
you 1) print a newline, 2) call fflush( stdout ), 3) use a stdio input
function, 4) the internal buffer overflows.

Since getch() is a conio function, it does not invoke rule 3.

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