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plz clarify...


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iqb_h_a Posted: Mon Jan 31, 2005 10:49 am


Joined: 24 Jan 2005

Posts: 2
plz clarify...
hi all...
      Can anybody clarify the defference between following two?

      #define NODE struct node
      typedef struct node NODE;
       
  First one is compiled by preprocessor, second one is compiled by compiler. Other than these is there any difference? Plz explain in detail...

thanks in advance

cheers
iqbal h a
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lenson18 Posted: Thu Feb 03, 2005 9:13 pm


Joined: 03 Feb 2005

Posts: 1
plz clarify...
"h a iqbal" <iqbal_h_a@...>
2005-01-31 10:19 AM

       
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       (PT) plz clarify...
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>>hi all...
>>      Can anybody clarify the defference between
following two?
>>
>>      #define NODE struct node
>>      typedef struct node NODE;
>>        
>>  First one is compiled by preprocessor,
second one is compiled by compiler.
>> Other than these is there any difference? Plz
explain in detail...
>>
>> thanks in advance
>>
>>cheers
>>iqbal h a

A macro definition is "text substituted" into
the code before compilation. This will make a difference in a scenario
like:
NODE* a, b;

If the #define is used, a will be of type "pointer
to struct node", while b will be of type "struct node".
Whereas, if the typedef is used, both a and b would be
of type "pointer to struct node".

Cheers,
Lenson
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haque_nasir Posted: Fri Feb 04, 2005 9:38 am


Joined: 04 Feb 2005

Posts: 1
plz clarify...
#define is a macro. Typedef gives a new name to the
existing dayatype. You cant use datatype names in
#define.

--- h a iqbal <iqbal_h_a@...> wrote:
> hi all...
> Can anybody clarify the defference between
> following two?
>
> #define NODE struct node
> typedef struct node NODE;
>
> First one is compiled by preprocessor, second one
> is compiled by compiler. Other than these is there
> any difference? Plz explain in detail...
>
> thanks in advance
>
> cheers
> iqbal h a
>





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