www.digitalmars.com         C & C++   DMDScript  

c++ - C style comments cause problem

reply SSingh <SSingh_member pathlink.com> writes:
While trying to make one of my old programs ANSI-C compatible, especially the
comments, I came across a problem. I have reduced the problem code to a few
lines. The compiler barfs on the following comments in the source code:

#include <stdio.h>

/* db 6 dup (0) == 00 00 00 00 00 00 */
int main()
{
printf("Hello world.\n");
return 0;
}

C:\DEV>sc sctest.c
sctest.c(9) : Lexical error: end of file found before end of comment, line 1
Fatal error: premature end of source file
--- errorlevel 1


I get this same error message from SC 6.1, SC 7.22, and DMC 8.40

I tried several compilers from Borland, MicroSoft, Watcom, LCC etc., and all of
them compile/run this code OK.

Is it something wrong with the source or is it due to the SC/DMC compiler?
Jan 19 2005
parent reply "Walter" <newshound digitalmars.com> writes:
I can't reproduce the error with the example given.

Is it possible you have an embedded zero or ^Z (0x1A) character inside the
comment?

"SSingh" <SSingh_member pathlink.com> wrote in message
news:csmiun$emo$1 digitaldaemon.com...

 While trying to make one of my old programs ANSI-C compatible, especially


the

 comments, I came across a problem. I have reduced the problem code to a


few

 lines. The compiler barfs on the following comments in the source code:

 #include <stdio.h>

 /* db 6 dup (0) == 00 00 00 00 00 00 */
 int main()
 {
 printf("Hello world.\n");
 return 0;
 }

 C:\DEV>sc sctest.c
 sctest.c(9) : Lexical error: end of file found before end of comment, line


1

 Fatal error: premature end of source file
 --- errorlevel 1


 I get this same error message from SC 6.1, SC 7.22, and DMC 8.40

 I tried several compilers from Borland, MicroSoft, Watcom, LCC etc., and


all of

 them compile/run this code OK.

 Is it something wrong with the source or is it due to the SC/DMC compiler?
Jan 19 2005
parent reply SSingh <SSingh_member pathlink.com> writes:
In article <csn5bk$157d$4 digitaldaemon.com>, Walter says...

I can't reproduce the error with the example given.

Is it possible you have an embedded zero or ^Z (0x1A) character inside the
comment?


[SNIP]

Yes, there was an embedded zero inside the comment, it only became apparent when
the text was viewed as hex values. But I wonder why the other compilers never
detected this?

Thanks for the hint and a quick reply.

If I am not mistaken then you must be Walter Bright, and I am a fan of your
compilers.

Let me also take this opportunity to thank and compliment you on the fine line
of compilers that you have developed. I own SC6.1 SC7.0 SC7.2 SC7.5 and I have
also tried the new DMC8.40. I also have compilers from Borland, MicroSoft, and
Watcom, but when compared to these your compilers could only be described as
"Greased Lightning."

I have been to your Home page and greatly enjoyed the "Trip Around the World
Charles Taylor Bright travels around the world at the turn of the century."

Thanks, keep up the good work, I hope the Language D also makes it big.
-SSingh
Jan 20 2005
parent "Walter" <newshound digitalmars.com> writes:
"SSingh" <SSingh_member pathlink.com> wrote in message
news:csohr3$2vr5$1 digitaldaemon.com...

 In article <csn5bk$157d$4 digitaldaemon.com>, Walter says...

Is it possible you have an embedded zero or ^Z (0x1A) character inside




the

comment?


 Yes, there was an embedded zero inside the comment, it only became


apparent when

 the text was viewed as hex values. But I wonder why the other compilers


never

 detected this?


DMC uses the 0 or ^Z as an "end of file" sentinel. Some early text editors
would mark end of file this way, with random garbage appearing after it.


 Thanks for the hint and a quick reply.

 If I am not mistaken then you must be Walter Bright, and I am a fan of


your

 compilers.

 Let me also take this opportunity to thank and compliment you on the fine


line

 of compilers that you have developed. I own SC6.1 SC7.0 SC7.2 SC7.5 and I


have

 also tried the new DMC8.40. I also have compilers from Borland, MicroSoft,


and

 Watcom, but when compared to these your compilers could only be described


as

 "Greased Lightning."


Thanks!


 I have been to your Home page and greatly enjoyed the "Trip Around the


World

 Charles Taylor Bright travels around the world at the turn of the


century."

Unfortunately, he died before I was born. I would really have liked to know
him. I have to be satisfied with the letters and family stories about him.


 Thanks, keep up the good work, I hope the Language D also makes it big.
 -SSingh
Jan 20 2005