Macros can Swap Pointers. and That is what the above code is doing.
On Mon, Oct 10, 2011 at 5:52 PM, rahul sharma <rahul23111...@gmail.com>wrote:
> macros i thnik cant swap pointers..i have doubt for same it is test ur c
> skil question
>
>
> On Sun, Oct 9, 2011 at 10:08 PM, sunny agrawal <sunny816.i...@gmail.com>wrote:
>
>> because you have not made any call to swap values of x and y
>>
>> I Don't know what you are trying to do here
>> if you want to swap values why are you not calling macro swap(x,y,int)
>> you are making a macro call to swap pointers and you can check that
>> pointer will get swapped.
>>
>>
>> On Sun, Oct 9, 2011 at 9:20 PM, Rajesh Kumar <testalgori...@gmail.com>wrote:
>>
>>>
>>>
>>> ---------- Forwarded message ----------
>>> From: Rajesh Kumar <testalgori...@gmail.com>
>>> Date: Sun, Oct 9, 2011 at 2:58 PM
>>> Subject: why we can not swap values using macro?
>>> To: algogeeks@googlegroups.com
>>>
>>>
>>> why this code doesn't swap values of x and y?
>>>
>>> #include<stdio.h>
>>> #define swap(a,b,c) c t;t=a,a=b,b=t;
>>> main()
>>> {
>>> float x=10,y=20;
>>> float *p,*q;
>>> p=&x,q=&y;
>>> swap(p,q,float *);
>>> printf("%d %d\n",x,y);
>>> }
>>>
>>>
>>> --
>>> Regards
>>> Rajesh Kumar
>>>
>>>
>>>
>>>
>>>
>>> --
>>> Regards
>>> Rajesh Kumar
>>>
>>>
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>>
>>
>>
>> --
>> Sunny Aggrawal
>> B.Tech. V year,CSI
>> Indian Institute Of Technology,Roorkee
>>
>>
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>
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--
Sunny Aggrawal
B.Tech. V year,CSI
Indian Institute Of Technology,Roorkee
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