Nested MACROS ??

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5 total messages Started by Stan Novinsky Fri, 29 Mar 1996 12:23

#4966

Author: Stan Novinsky
Date: Fri, 29 Mar 1996 12:23

9 lines
729 bytes

I am using a nested MACRO.  The problem is that only the 
inner part is execur

Given the following MACRO definitions and code,

 #define CUBE(X)   ((x * x) * x)
 #define ABS(X)    ((x < 0)   ? -(x) : (x))

 #define NEST(X)        (ABS(CUBE(X)))

Re: Nested MACROS ??

#4969

Author: Eric J. Korpela
Date: Fri, 29 Mar 1996 19:38

20 lines
1036 bytes

In article <4jgkno$mrr@aplinfo.jhuapl.edu>,
Stan Novinsky  <stan_novinsky@jhuapl.edu> wrote:
>I am using a nested MACRO.  The problem is that only the 
>inner part is execur
>
>Given the following MACRO definitions and code,
>
> #define CUBE(X)   ((x * x) * x)
> #define ABS(X)    ((x < 0)   ? -(x) : (x))
>
> #define NEST(X)        (ABS(CUBE(X)))

The C preprocessor is case sensitive.  Look carefully at your code.

Eric
-- 
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korpela@ssl.berkeley.edu            |  stopped.
<a href="http://www.cs.indiana.edu/finger/mofo.ssl.berkeley.edu/korpela/w">
Click here for more info.</a>

Re: Nested MACROS ??

#4975

Author: Stan Novinsky
Date: Mon, 01 Apr 1996 17:27

16 lines
899 bytes

Yes, I ses the problem.  I took care of it 
by changing to lower case x, however, I still 
don't understand why the call to the MACROS on 
an individual basis works...

EX :

  X = 4;

  cube_ans = CUBE(X);

This returns the correct value (64) when I run the program...

Thanks for all the responses ...

Stan

Re: Nested MACROS ??

#4978

Author: James M. Curran
Date: Tue, 02 Apr 1996 20:58

25 lines
1265 bytes

In <<4jp3mi$bqc@aplinfo.jhuapl.edu>>, 
Stan Novinsky <stan_novinsky@jhuapl.edu> wrote:

>Yes, I ses the problem.  I took care of it 
>by changing to lower case x, however, I still 
>don't understand why the call to the MACROS on 
>an individual basis works...
>EX :
>  X = 4;
>  cube_ans = CUBE(X);

>This returns the correct value (64) when I run the program...
>Thanks for all the responses ...

	No it doesn't -- it won't even compile.  However, if you change the
first line to "int x = 4;"  (note lower-case this time) then it will.
CUBE() as it was written in your original post will cube the value
stored in the varaible named (lowercase) "x".  The arguement to CUBE
is ignored (since it doesn't appear in the macro definition)




       Truth,
       James

Re: Nested MACROS ??

#4980

Author: Christopher R Volpe
Date: Tue, 02 Apr 1996 21:32

20 lines
1154 bytes

Stan Novinsky wrote:
> 
> I am using a nested MACRO.  The problem is that only the
> inner part is execur
> 
> Given the following MACRO definitions and code,
> 
>  #define CUBE(X)   ((x * x) * x)
>  #define ABS(X)    ((x < 0)   ? -(x) : (x))
> 
>  #define NEST(X)        (ABS(CUBE(X)))

It would probably help if you didn't mix'n'match capital X's and
lowercase x's in your macro "prototype" and replacement list.

--

Chris Volpe				Phone: (518) 387-7766 (Dial Comm 8*833
GE Corporate R&D			Fax:   (518) 387-6560
PO Box 8, Schenectady, NY 12301		Email: volpecr@crd.ge.com

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