• Paul Smirnov <s.paul mail.ru> Nov 13 2006
• Walter Bright <newshound digitalmars.com> Nov 13 2006
• Me & My <kirankhan005 hotmail.com> Nov 20 2006
• ralph <ralph.hipps gmail.com> Nov 23 2006
• Walter Bright <newshound digitalmars.com> Nov 23 2006
• ralph <ralph.hipps gmail.com> Nov 23 2006
• ralph <ralph.hipps gmail.com> Nov 23 2006
• Walter Bright <newshound digitalmars.com> Nov 23 2006
• ralph <ralph.hipps gmail.com> Nov 23 2006
• ralph <ralph.hipps gmail.com> Nov 23 2006
• Walter Bright <newshound digitalmars.com> Nov 23 2006
• ralph <ralph.hipps gmail.com> Nov 24 2006
• Walter Bright <newshound digitalmars.com> Nov 24 2006
• Paul Smirnov <s.paul mail.ru> Dec 01 2006
• Paul Smirnov <s.paul mail.ru> Dec 01 2006
• Walter Bright <newshound digitalmars.com> Dec 01 2006

Hello all,

As far as I understand, standard C preprocessor works with text files and
knows nothing about C but that's not right with DMC which refuses to
preprocess ("-e" option) plain text files.

I mean, is it right that there's no way to use DMC to preprocess non-c (or
invalid c) files? Am I missing something? I get lexical errors with DMC where
I get correctly preprocessed text files with "cl /P" or "gcc -E".

Thanks,
Paul.

Paul Smirnov wrote:
 As far as I understand, standard C preprocessor works with text files and
 knows nothing about C but that's not right with DMC which refuses to
 preprocess ("-e" option) plain text files.
 
 I mean, is it right that there's no way to use DMC to preprocess non-c (or
 invalid c) files? Am I missing something? I get lexical errors with DMC where
 I get correctly preprocessed text files with "cl /P" or "gcc -E".


A standard compliant preprocessor will not work with text files that are 
invalid C code. The preprocessor is defined to work by tokenizing the 
source text into preprocessor tokens; if there are non-C tokens in the 
source text, it will (correctly) fail.

any one wants help in programming ( c++ ), then i m present at
here e-mail me at: kirankhan005 hotmail.com, for any Question in
C++

ok, dusting off many years of rust in my C programming, trying dmc, and what
seems
to be perfectly valid cpp code (hello world) generates three errors, mostly abut
expecting ; or whatever after } or { or return statement.

I assume this is a setup issue, any thoughts?

ralph wrote:
 ok, dusting off many years of rust in my C programming, trying dmc, and what
seems
 to be perfectly valid cpp code (hello world) generates three errors, mostly
abut
 expecting ; or whatever after } or { or return statement.
 
 I assume this is a setup issue, any thoughts?


Try the -cpp switch.

code:

#include <iostream.h>


int main();
{
cout <<"Hello World!\n";
    return 0;
}

-------------

error:

{
^
hello.cpp(5) : Error: '=', ';' or ',' expected
    return 0;
         ^
hello.cpp(7) : Error: '=', ';' or ',' expected
}
^
hello.cpp(8) : Error: identifier or '( declarator )' expected
--- errorlevel 1

and that's the same error with the -cpp switch.

ralph wrote:
 #include <iostream.h>
 
 
 int main();
 {
 cout <<"Hello World!\n";
     return 0;
 }
 


Remove the ; after main().

that was it!!! I copied the wrong example.

this should work, right?

code:

#include <iostream.h>
int main()
{
int x = 5;
int y = 7;
cout "\n";
cout << x + y << " " << x * y;
cout "\n";
return 0;
}

error:

cout "\n";
        ^
ch1_1.cpp(6) : Error: ';' expected following declaration of struct member
cout "\n";
        ^
ch1_1.cpp(8) : Error: ';' expected following declaration of struct member
--- errorlevel 1

ralph wrote:
 this should work, right?
 
 code:
 
 #include <iostream.h>
 int main()
 {
 int x = 5;
 int y = 7;
 cout "\n";


need an operator between cout and "\n"

 cout << x + y << " " << x * y;
 cout "\n";
 return 0;
 }
 
 error:
 
 cout "\n";
         ^
 ch1_1.cpp(6) : Error: ';' expected following declaration of struct member
 cout "\n";
         ^
 ch1_1.cpp(8) : Error: ';' expected following declaration of struct member
 --- errorlevel 1
 

yep, that was it!!

I have this html 'book' called teach yourself c++ in 21 days, and I copy and
paste
the examples into the editor and compile them, and they seem to have syntax
errors
sometimes. Maybe the rest will be better, and maybe this is a good way to
learn, I
dunno, but it seems odd that the author would do this.

It's also odd that I'm not getting better error messaging from any of the
compilers, that would make it easier to fix the errors. I am trying out dmc,
turbo
c++ 3.0, and turbo c++ 10.1. All give basically the same cryptic error message.
Anything better out there? Ideally I'd like to find something to make games
with,
something that I can do graphics and sound with, not create applications or
standard forms or the like. More of a console app I guess?

ralph wrote:
 It's also odd that I'm not getting better error messaging from any of the
 compilers, that would make it easier to fix the errors. I am trying out dmc,
turbo
 c++ 3.0, and turbo c++ 10.1. All give basically the same cryptic error message.
 Anything better out there? Ideally I'd like to find something to make games
with,
 something that I can do graphics and sound with, not create applications or
 standard forms or the like. More of a console app I guess?


Lousy error messages is a standard feature of C++. It's fallout from the 
syntax being so complicated, the compiler cannot very well guess what 
you were trying to do.

 A standard compliant preprocessor will not work with text files that are
 invalid C code. The preprocessor is defined to work by tokenizing the
 source text into preprocessor tokens; if there are non-C tokens in the
 source text, it will (correctly) fail.


Right, preprocessor works with C tokens but not necessary with C programs.
Here's
an example:

-[cut a.c]-----------------
#define world Earth
hello, world
-[end cut]-----------------

Everything is built from correct tokens but "dmc -e a.c" refuses to preprocess
the
"program" with the following error:

a.c(2) : Error: missing ',' between declaration of 'The' and 'Earth'

Am I still wrong?

== Quote from Paul Smirnov (s.paul mail.ru)'s article
 A standard compliant preprocessor will not work with text files that are
 invalid C code. The preprocessor is defined to work by tokenizing the
 source text into preprocessor tokens; if there are non-C tokens in the
 source text, it will (correctly) fail.


 an example:


Oops... It was:

-[cut a.c]-----------------
#define world The Earth
hello, world
-[end cut]-----------------

 Everything is built from correct tokens but "dmc -e a.c" refuses to preprocess
the
 "program" with the following error:
 a.c(2) : Error: missing ',' between declaration of 'The' and 'Earth'
 Am I still wrong?

Paul Smirnov wrote:
 A standard compliant preprocessor will not work with text files that are
 invalid C code. The preprocessor is defined to work by tokenizing the
 source text into preprocessor tokens; if there are non-C tokens in the
 source text, it will (correctly) fail.


 Right, preprocessor works with C tokens but not necessary with C programs.
Here's
 an example:
 
 -[cut a.c]-----------------
 #define world Earth
 hello, world
 -[end cut]-----------------
 
 Everything is built from correct tokens but "dmc -e a.c" refuses to preprocess
the
 "program" with the following error:
 
 a.c(2) : Error: missing ',' between declaration of 'The' and 'Earth'
 
 Am I still wrong?


dmc is still running the c compiler. All -e does is to send preprocessed 
output to the console when an error is diagnosed. To preprocess only, 
use the standalone preprocessor, sppn.exe.