#define errors

[mohan]

Hi All.

I have error message

#include <stdio.h>

#define NAV_FORMAT_VERS ION 10

#define OC_LM_ANNOT 1

#define OC_LM_SHAPE 0

#define OC_EXIST_MASK OC_LM_ANNOT | \

#if NAV_FORMAT_VERS ION == 10

OC_LM_SHAPE

#endif

int main()

{

if ( OC_EXIST_MASK)

printf( " Defined");

else

printf( " Not defined ");

return 0;

}



Kindly let me know my mistake....



Mohan

[Lucien Kennedy-Lamb]

Re: #define errors

You don't mention what the error is but I suspect it's an unexpected
#endif.

A trailing \ on a #define has a special meaning and includes the next
line as part of the #define. This means the following #if ... line
doesn't have any effect.

It still won't compile - what was your intention here?

Lucien Kennedy-Lamb

[mohan]

Re: #define errors

error message is as follows

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

"macro.c", line 8: syntax error before or at: |

"macro.c", line 9: #if-less #endif

"macro.c", line 14: invalid source character: '#'

"macro.c", line 14: syntax error before or at: if

cc: acomp failed for macro.c



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

"Lucien Kennedy-Lamb" <lucien0@gmail. com> wrote in message
news:1137474660 .942737.57980@o 13g2000cwo.goog legroups.com...[color=blue]
> You don't mention what the error is but I suspect it's an unexpected
> #endif.
>
> A trailing \ on a #define has a special meaning and includes the next
> line as part of the #define. This means the following #if ... line
> doesn't have any effect.
>
> It still won't compile - what was your intention here?
>
> Lucien Kennedy-Lamb
>[/color]

[mohan]

Re: #define errors

i wanted to include symbol OC_LM_SHAPE only when NAV_FORMAT_VERS ION is
defined


"Lucien Kennedy-Lamb" <lucien0@gmail. com> wrote in message
news:1137474660 .942737.57980@o 13g2000cwo.goog legroups.com...[color=blue]
> You don't mention what the error is but I suspect it's an unexpected
> #endif.
>
> A trailing \ on a #define has a special meaning and includes the next
> line as part of the #define. This means the following #if ... line
> doesn't have any effect.
>
> It still won't compile - what was your intention here?
>
> Lucien Kennedy-Lamb
>[/color]

[Logan Shaw]

Re: #define errors

mohan wrote:[color=blue]
> i wanted to include symbol OC_LM_SHAPE only when NAV_FORMAT_VERS ION is
> defined[/color]

I'm fairly sure you can't put an #if in the right-hand side of a #define.

- Logan

[Lucien Kennedy-Lamb]

Re: #define errors


Logan Shaw wrote:[color=blue]
> mohan wrote:[color=green]
> > i wanted to include symbol OC_LM_SHAPE only when NAV_FORMAT_VERS ION is
> > defined[/color]
>
> I'm fairly sure you can't put an #if in the right-hand side of a #define.
>
> - Logan[/color]

Your right Logan. All preprocessor directives must start on their own
line and can't be constructed by other preprocessor directives.

The preprocessor won't recursively parse the source file.

I think your solution is:

#if NAV_FORMAT_VERS ION == 10
#define OC_EXIST_MASK (OC_LM_ANNOT | OC_LM_SHAPE)
#else
#define OC_EXIST_MASK OC_LM_ANNOT
#endif

Lucien Kennedy-Lamb

[Jaspreet]

Re: #define errors

mohan wrote:[color=blue]
> i wanted to include symbol OC_LM_SHAPE only when NAV_FORMAT_VERS ION is
> defined
>
>
> "Lucien Kennedy-Lamb" <lucien0@gmail. com> wrote in message
> news:1137474660 .942737.57980@o 13g2000cwo.goog legroups.com...[color=green]
> > You don't mention what the error is but I suspect it's an unexpected
> > #endif.
> >
> > A trailing \ on a #define has a special meaning and includes the next
> > line as part of the #define. This means the following #if ... line
> > doesn't have any effect.
> >
> > It still won't compile - what was your intention here?
> >
> > Lucien Kennedy-Lamb
> >[/color][/color]

#if NAV_FORMAT_VERS ION == 10
#define OC_LM_SHAPE 0
#endif

OR

You could also use the #ifdef macro.

However, I still could not understand what you meant by the statement:
#define OC_EXIST_MASK OC_LM_ANNOT | \

With what do you want to OR the OC_LM_ANNOT flag ?

[Jaspreet]

Re: #define errors

mohan wrote:[color=blue]
> i wanted to include symbol OC_LM_SHAPE only when NAV_FORMAT_VERS ION is
> defined
>
>
> "Lucien Kennedy-Lamb" <lucien0@gmail. com> wrote in message
> news:1137474660 .942737.57980@o 13g2000cwo.goog legroups.com...[color=green]
> > You don't mention what the error is but I suspect it's an unexpected
> > #endif.
> >
> > A trailing \ on a #define has a special meaning and includes the next
> > line as part of the #define. This means the following #if ... line
> > doesn't have any effect.
> >
> > It still won't compile - what was your intention here?
> >
> > Lucien Kennedy-Lamb
> >[/color][/color]

#if NAV_FORMAT_VERS ION == 10
#define OC_LM_SHAPE 0
#endif

Or you also use #ifdef macro.

However i still could not understand what you meant by:
#define OC_EXIST_MASK OC_LM_ANNOT | \

With what do you want to OR the OC_LM_ANNOT flag to ?

[Jaspreet]

Re: #define errors

mohan wrote:[color=blue]
> i wanted to include symbol OC_LM_SHAPE only when NAV_FORMAT_VERS ION is
> defined
>
>
> "Lucien Kennedy-Lamb" <lucien0@gmail. com> wrote in message
> news:1137474660 .942737.57980@o 13g2000cwo.goog legroups.com...[color=green]
> > You don't mention what the error is but I suspect it's an unexpected
> > #endif.
> >
> > A trailing \ on a #define has a special meaning and includes the next
> > line as part of the #define. This means the following #if ... line
> > doesn't have any effect.
> >
> > It still won't compile - what was your intention here?
> >
> > Lucien Kennedy-Lamb
> >[/color][/color]

#if NAV_FORMAT_VERS ION == 10
#define OC_LM_SHAPE 0
#endif

Or you also use #ifdef macro.

However i still could not understand what you meant by:
#define OC_EXIST_MASK OC_LM_ANNOT | \

With what do you want to OR the OC_LM_ANNOT flag to ?

[Mark McIntyre]

Re: #define errors

On Tue, 17 Jan 2006 10:47:45 +0530, in comp.lang.c , "mohan"
<mohan.bhakri@i n.bosch.com> wrote:
[color=blue]
>i wanted to include symbol OC_LM_SHAPE only when NAV_FORMAT_VERS ION is
>defined[/color]

#if defined (NAV_FORMAT_VER SION)
#define OC_LM_SHAPE
#endif

Also...
[color=blue]
>#define OC_EXIST_MASK OC_LM_ANNOT | \[/color]

what are the trailing |\ doing there?
[color=blue]
>#if NAV_FORMAT_VERS ION == 10
>OC_LM_SHAPE
>#endif[/color]

Remember that macros are literally replaced in the code by their
value. So this translates into

#if 10 == 10
0
#endif

which is a syntax error


Mark McIntyre
--

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[mohan]

Re: #define errors

thanks a lot
"Lucien Kennedy-Lamb" <lucien0@gmail. com> wrote in message
news:1137476694 .308427.121770@ g14g2000cwa.goo glegroups.com.. .[color=blue]
>
> Logan Shaw wrote:[color=green]
> > mohan wrote:[color=darkred]
> > > i wanted to include symbol OC_LM_SHAPE only when NAV_FORMAT_VERS ION is
> > > defined[/color]
> >
> > I'm fairly sure you can't put an #if in the right-hand side of a[/color][/color]
#define.[color=blue][color=green]
> >
> > - Logan[/color]
>
> Your right Logan. All preprocessor directives must start on their own
> line and can't be constructed by other preprocessor directives.
>
> The preprocessor won't recursively parse the source file.
>
> I think your solution is:
>
> #if NAV_FORMAT_VERS ION == 10
> #define OC_EXIST_MASK (OC_LM_ANNOT | OC_LM_SHAPE)
> #else
> #define OC_EXIST_MASK OC_LM_ANNOT
> #endif
>
> Lucien Kennedy-Lamb
>[/color]