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;
Paul Herring <[EMAIL PROTECTED]> wrote:
From: ashwin mittal [mailto:[EMAIL PROTECTED]
>--- [EMAIL PROTECTED] wrote:
>> --- In [EMAIL PROTECTED], srikanth
I replied to this post from the web, mistakingly thinking it was a
recent post, apologies for bringing it up again - I did ask the
moderator to delete instead of approve my post, however it seems to have
escaped...
>> poojary <[EMAIL PROTECTED]> wrote:
>> > main()
>> > {
>> > int i=5;
>> > printf("%d%d%d%d%d",i++,i--,++i,--i,i);
>> > }
>> >
>> >
>> > what is the o/p and why?
>>
>> Output may be anything and it would be correct. See:
>> <http://www.eskimo.com/~scs/C-faq/q3.1.html> and the
>> next few questions.
>
>Hi all,
>
>The Printf _expression_ is compile from Right to left...
'compiled' maybe, if only because the compiler may go serially through
the file (though The Standard has nothing to say on the matter)
>So starting from right,
>i,
>--i,
>++i,
>i--,
>i++
>
>the sequence goes like this....
>
>So
>i = 5;
>--i = 4;
>++i = 5;
>i-- = 5;
>i++ = 4
This has nothing to do with whatever answer your instance of the program
comes up with.
>But the printf will display the output in that
>sequence in which it is demanded...
>i.e. from left to right...
No it isn't. The order of evaluation of the parameters to a function is
not defined. The comma separating parameters is not the comma operator,
it is merely a separator. The only thing that is guaranteed about the
expressions is t hat all of them will be evaluated by the time the
function (printf() in this case) is called.
The compiler and/or runtime is free to evaluate the parameters from the
left, right, or in any order that (to the untrained eye) doesn't make
any sense.
>i++,
>i--,
>++i,
>--i,
>i
So this is wrong. In the sense that this is not necessarily what will
happen.
>Accordingly the values are displayed as such...
>i.e
>4 5 5 4 5
However, that happens to be one of the correct answers. As would '42',
'Hello World' or formatting your hard drive. Try looking at the link I
suggested, and that you quoted.
--
PJH
If Windows is the solution, can we please have the problem back?
unknown
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