Re: (PT) query about typedef and pointers

[Fernando Arturo G�mez Flores]

> Hi guys,
>
>
> I have some doubt about Typedef and Swpping pointers..
>
> Why we r using typedef for stucture...Ex.
>
> typedef struct muthu{
> int a;
> int b;
> }good;
>
> void main()
> {
> good *a1;
>
> a1= (good*) mallloc(muthu);
>
> }
>
>
> My question is y we are using typedef for structre is there any particular
use?
>
>
> 2. How we can swap the pointer variable without third variable;
>
For your question 1, as far as I know, in pure C, the complete type of your
structure is "struct muthu". Hence if you want to use it in a function,
you'll have to declare the parameter as struct muthu:

void anyFunction(struct muthu* pParam)
{
    // whatever
}

If you use a typedef, then you get a strongly typped shortcut:

typedef struct muthu good;

void  anyFunction(good* pParam)
{
    // whatever
}

Now, recall the "strongly typped" phrase. Although they have the same size
and members, they are different types.

Regards,
Fernando Gomez.









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