Re: Looking for OpenGL "hello world"

[Fred Kulack <kulack at us dot ibm dot com>]

cygwin-xfree-owner@cygwin.com wrote on 12/28/2004 03:06:55 AM:
> --- a.c ---
> #include <stdio.h>
> int main(void) {puts("Hello world!");return(0);}
> /* the empty line below is required to compile properly */
> 
> -------------
> 
> should work just doing gcc -o a a.c.

Hmm....
Is there a reason you go so far as to explicitly indicate that a newline 
is required
at the end of the file? Seems like you're being a bit complex? 
Is there a good reason? (I do see an old gcc bug talking about gcc 
generating 2 warnings 
for this occurance, but its like 4 years old).

As far as I know, this requirement is rather esoteric and its difficult 
to get it to fail (editors I try always put a newline at the end and even 
if you skip
a newline explicitly, all you get is a warning).
Opening a.c in vi for example and saving the file immediately fixes the 
problem.

> echo -n '#include <stdio.h>
int main(void) {puts("Hello world!");return(0);}' > a.c

> od -tx1c a.c
0000000 23 69 6e 63 6c 75 64 65 20 3c 73 74 64 69 6f 2e
          #   i   n   c   l   u   d   e       <   s   t   d   i   o   .
0000020 68 3e 0a 69 6e 74 20 6d 61 69 6e 28 76 6f 69 64
          h   >  \n   i   n   t       m   a   i   n   (   v   o   i   d
0000040 29 20 7b 70 75 74 73 28 22 48 65 6c 6c 6f 20 77
          )       {   p   u   t   s   (   "   H   e   l   l   o       w
0000060 6f 72 6c 64 21 22 29 3b 72 65 74 75 72 6e 28 30
          o   r   l   d   !   "   )   ;   r   e   t   u   r   n   (   0
0000100 29 3b 7d
          )   ;   }
0000103

> gcc a.c
a.c:2:49: warning: no newline at end of file


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