The Lounge - CodeProject

Re: Rediscovering the 1990s

BernardIE531715-Mar-24 16:28

BernardIE5317

15-Mar-24 16:28

Not bad. Rather Pleasant. I sometimes code to that 40 Hz binaural stuff.

Syntax Error

Amarnath S15-Mar-24 4:38

Amarnath S

15-Mar-24 4:38

Student: I am getting Syntax Error in my code.
Teacher: Show me your code.
Student: Here it is:

#include<iostream>
using namespace std;

void main()
{
    cout << "Syntax Error" << endl;
}

Teacher: Grrrrrr...

Where's my coat?

Re: Syntax Error

dandy7215-Mar-24 6:33

dandy72

15-Mar-24 6:33

It's been years I've written as much as a Hello World in C++; would all modern parsers be 100% okay with the fact that there's no space between the #include and the following <iostream>?

Re: Syntax Error

0x01AA15-Mar-24 6:44

0x01AA

15-Mar-24 6:44

Just tried it with a 20 year old borland c++ compiler and it accepts

#include<vcl.h>
#include"Mainwindow.h"

Re: Syntax Error

dandy7215-Mar-24 6:49

dandy72

15-Mar-24 6:49

Now throw Resharper at it. It'll bitch and complain until you fix it or disable the check.

I like R# for some of its suggestions, but sometimes it goes overboard and annoys me to no end.

Re: Syntax Error

Richard MacCutchan15-Mar-24 6:49

Richard MacCutchan

15-Mar-24 6:49

You can write an entire C/C++ program on a single line, which is why all those punctuation characters are so important.

Re: Syntax Error

Mircea Neacsu15-Mar-24 7:36

Mircea Neacsu

15-Mar-24 7:36

Richard MacCutchan wrote:
You can write ~~an entire~~ some C/C++ programs on a single line,

FTFY

Sometimes you cannot:

C++

#define A "Hello world!\n"
int main(int argc, char** argv)
{
  printf (A);
  return 0;
}

When discussion comes to blanks and line endings I always remember a funny picture from an old book.

Mircea

Re: Syntax Error

Richard Andrew x6415-Mar-24 7:41

Richard Andrew x64

15-Mar-24 7:41

Well technically, the #define is not part of the program, is it?

The difficult we do right away...
...the impossible takes slightly longer.

Re: Syntax Error

Mircea Neacsu15-Mar-24 7:48

Mircea Neacsu

15-Mar-24 7:48

I would say that "technically", the preprocesor is part of the language (preprocessor is defined in K&R), hence #define is part of the program.

However, I'm not going to start a war here about such minutia, and specially not with such nice people. Smile | :)

Mircea

Re: Syntax Error

Richard Andrew x6415-Mar-24 8:55

Richard Andrew x64

15-Mar-24 8:55

Would you care to discuss tabs v. spaces? Smile | :)

The difficult we do right away...
...the impossible takes slightly longer.

Re: Syntax Error

honey the codewitch15-Mar-24 9:36

honey the codewitch

15-Mar-24 9:36

*Python has entered the chat*

Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix

Re: Syntax Error

honey the codewitch15-Mar-24 8:32

honey the codewitch

15-Mar-24 8:32

If it's not, then neither is #include

Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix

Re: Syntax Error

Richard Andrew x6415-Mar-24 8:53

Richard Andrew x64

15-Mar-24 8:53

Completely agree.

The difficult we do right away...
...the impossible takes slightly longer.

Re: Syntax Error

PIEBALDconsult15-Mar-24 9:39

PIEBALDconsult

15-Mar-24 9:39

Correct.
Pre-processor directives are resolved before the code reaches the actual C/C++ compiler.
The output of whatever pre-processor(s) you use is the actual code.

Or -- as I do -- use a C/C++ pre-processor to resolve directives I put in C# and pass the result to the C# compiler.

But you know that.

Re: Syntax Error

honey the codewitch15-Mar-24 9:44

honey the codewitch

15-Mar-24 9:44

I do.

I am open to the reasonable disagreement about whether or not the preprocessor is part of the language, even if not part of the compiler itself. I think either position is valid, depending on which rubber ruler you use, and so I'm not really about debating that, but I think that's the question here.

Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix

Re: Syntax Error

PIEBALDconsult15-Mar-24 10:09

PIEBALDconsult

15-Mar-24 10:09

Yep, but I think I further irk you by using it for purposes other than its original intent.

Re: Syntax Error

honey the codewitch15-Mar-24 10:23

honey the codewitch

15-Mar-24 10:23

I'm actually not really so concerned about that sort of thing or I wouldn't like C++ metaprogramming as much as I do, which is essentially using template in ways other than for that which it was designed.

Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix

Re: Syntax Error

jschell15-Mar-24 12:48

jschell

15-Mar-24 12:48

Interesting.

Is the preprocessor part of the language?

What one can state specifically is that is part of the specification.

Is there a formal definition of the language outside of the specification?

From Stroustrup in the "Annotated C++ Reference Manual" (page 5)

"A file is conceptually translated in several phases ... The first phase is preprocessing"

So I would guess he would claim it is not C++ without the preprocessor.

Re: Syntax Error

honey the codewitch15-Mar-24 14:59

honey the codewitch

15-Mar-24 14:59

I tend to agree with this take, but considering the C++ compiler eats postprocessed C++ implementation files (i don't want to get into modules and stuff) and doesn't understand preprocessed C++ I think there's room for a reasonable person to suggest that it's somewhat (for lack of a better term) orthogonal to the language.

Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix

Re: Syntax Error

PIEBALDconsult15-Mar-24 8:14

PIEBALDconsult

15-Mar-24 8:14

There exists at least one C/C++ program which can be written in one line.

I try to avoid putting any pre-processor directives in my C/C++ files -- an include can be specified at the command line for the compilers I use.

I somewhat agree that the language of C/C++ and its pre-processor are separate languages. One can create any number of alternative pre-processor languages -- K&R's is just one.
Maybe you haven't used Oracle's PRO*C or RDB's version for embedding SQL in C/C++ programs.

One thing I want in a pre-processor is the ability to tell it which directives to process and which to leave for later. I have had to jump through hoops to get things to work the way I want.

And I do like lots of SPACEs which are not "required":
# include <vcl.h>
# include "Mainwindow.h"

Re: Syntax Error

Mircea Neacsu15-Mar-24 8:40

Mircea Neacsu

15-Mar-24 8:40

PIEBALDconsult wrote:
an include can be specified at the command line for the compilers I use

Interesting! I know how to specify an include path but not a file.

PIEBALDconsult wrote:
Maybe you haven't used Oracle's PRO*C or RDB's version for embedding SQL in C/C++ programs.

No, never! I've been fortunate in that respect Poke tongue | ;-P

The closest I got was using SQLITE Big Grin | :-D

Mircea

Re: Syntax Error

PIEBALDconsult15-Mar-24 10:05

PIEBALDconsult

15-Mar-24 10:05

Mircea Neacsu wrote:
but not a file

If I recall correctly, with VAX/DEC/Compaq/HP C the switch is /FirstInclude.
I don't have an installation of Microsoft's C/C++ compiler on this system -- nor Borland's C/C++ or GCC -- but I can try to have a look when I get home.

MingW:
An example from Implanting Common Code in Unrelated Classes[^]

"C:\mingw\bin\cpp" -P -C -include "c:\batfiles\ImplantWarning.h" D__NAME_SPACE__=%3 -D__CLASS_NAME__=%4 -w "%1" "%2"

I'm sure I have it for Microsoft's C/C++ compiler (cl.exe) as well. I have probably referred to it in the past.

Oh!:
Re: c program - C / C++ / MFC Discussion Boards[^]

F:\Projects>cl.exe /nologo /FIstdio.h /DSEMI=; nosem.c

Re: Syntax Error

Mircea Neacsu15-Mar-24 10:10

Mircea Neacsu

15-Mar-24 10:10

Nice! You live, you learn.

Mircea

Re: Syntax Error

dandy7215-Mar-24 8:17

dandy72

15-Mar-24 8:17

Agreed, but I'm not sure all tokenizers would be happy with the lack of a space, which in this case might be considered as significant as a punctuation character. But then, I suppose when you see something starting with "#include", the next character really should not be part of that token. Especially when it's a reserved character such as < or ", so I suppose the situation is easy enough to detect and allow.

Re: Syntax Error

honey the codewitch15-Mar-24 10:07

honey the codewitch

15-Mar-24 10:07

It wouldn't be part of the token in most tokenizer implementations.

"include" would be a preproc keyword.**

** or identifier if the tokenizer doesn't distinguish between idents and keywords as is often the case.

Most of the time, whitespace is hidden during tokenization before the parser gets to it so the parser wouldn't really care if there was no whitespace unless the developer put in extra effort for it to care.

Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix

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