Boyd Stephen Smith Jr. wrote: > In <[email protected]>, Siggy Brentrup wrote: >> On Fri, Jul 31, 2009 at 16:48 +0800, Timothy Wu wrote: >>> On Fri, Jul 31, 2009 at 3:53 PM, frank <[email protected]> wrote: >>>> Check out the menu.lst file. >>> Whoa! I didn't know text hidden in those comments are actually in-use. <<--deleted-->> > > 3. Lines starting with a single '#' are comments in C *unless* the '#' is > immediately followed by a pre-processor command. This is similar -- you can > think of update-grub as a GRUB menu.lst pre-processor.
The sharp/hash symbol is a preprocessor indicator. "Pure" C has never
supported anything other than '/*...*/' for comments. C++ added the
single line comment marker '//' (double forward slash).
#include <stdio.h>
# Is this a comment?
main()
{
printf("Hello, world.\n");
}
$ make tstit
cc tstit.c -o tstit
tstit.c:4:3: error: invalid preprocessing directive #Is
make: *** [tstit] Error 1
$
<<--deleted-->>
It is possible to use the preprocessor to do weird and wonderful,
things, so I believe you could even have it ignore lines beginning with
a hash mark, effectively treating them as comments, but that is
definitely not "normal".
--
Bob McGowan
smime.p7s
Description: S/MIME Cryptographic Signature
