From:	"John M. Aldrich" <fighteer AT cs DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: (possible) printf bug
Date:	Sun, 08 Dec 1996 22:07:35 -0800
Organization:	Three pounds of chaos and a pinch of salt
Lines:	34
Message-ID:	<32ABACA7.2C70@cs.com>
References:	<01bbe56f$dd5b4f60$666fd9ce AT scully>
Reply-To:	fighteer AT cs DOT com
NNTP-Posting-Host:	ppp108.cs.com
Mime-Version:	1.0
To:	Cephaler <scully AT ix DOT netcom DOT com>
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Cephaler wrote:
> 
> printf("Loading prefs...");
> ....
> window(1,1,80,4);
> cprintf("Choose an option:\n\r1) start\n\r2) load\n\r3) quit\n\r? ");
> fscanf(" %d", &choice);

Under DJGPP, stdout is line buffered, so anything you write with
printf(), puts(), putchar(), etc, will not show up until one of the
following occurs:

 - You print a newline to stdout.
 - You flush stdout.
 - You invoke an input function which reads from stdin.
 - You overflow the internal stdout buffer.
 - You issue a sync() or other command which affects all open files.
 - Your program exits.

In your program, you are mixing <stdio.h> functions with <conio.h>
functions, which always leads to trouble.  For example, if somebody were
to redirect the stdout of your program with "prog >prog.out", "Loading
prefs..." would be written to prog.out, and the rest of the text would
show up on the screen.  Very bad behavior.

In short, if you're going to use <conio.h> in a program, all its input
and output should be done using <conio.h> functions.

-- 
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