sorry its left shift.. one mistake.. other than this ans is correct.. i have
done left shift on 1 by 4 bits that why result became ~(00000.....10000)
ignore the right shift i have mentioned..
On Sun, Nov 25, 2012 at 4:48 PM, Rahul Kumar Patle <
patlerahulku...@gmail.com> wrote:
> @pandey : here you are shifting 1 to right by 4 bit (as rushiraj said
> correctly)
> which becomes 00000.....10000, then you are doing negation which becomes
> 111111...01111(mask)
> now do you and operation
> mask & 56 = 40
> mask & 64 = 64
> mask & 127 = 111
> you can notice that only 5th lsb (effective value 16) is zero which is
> present in 56 and 127 but not in 64
> so 64 remains the same but 56 and 127 got reduced by 16.
>
>
> On Sat, Nov 24, 2012 at 8:36 PM, Dave <dave_and_da...@juno.com> wrote:
>
>> @Rajesh: In binary, mask = 111...100000 (with 4-byte ints, this is 27
>> 1-bits followed by 5 0-bits). The logical product of num with mask zeros
>> out the low order 5 bits while retaining the high order 27 bits. Thus, res
>> is num truncated to the largest multiple of 32 that does not exceed num. 56
>> = (1*32 + 24) goes to 1*32 = 32, 64 (=2*32 + 0) stays at 2*32 = 64, and 127
>> (=3*32 + 31) goes to 3*32 = 96.
>>
>> Dave
>>
>> On Saturday, November 24, 2012 2:45:24 AM UTC-6, rajesh pandey wrote:
>>
>>> void dosomething(int num)
>>> {
>>> int mask=~(1<<5-1);
>>> int res=num&mask;
>>> printf("%d",res);
>>> }
>>> int main()
>>> {
>>> dosomething(56);
>>> dosomething(64);
>>> dosomething(127);
>>> return 0;
>>> }
>>>
>>> please explain the logic behind the output.
>>>
>>> Thanks,
>>> Rajesh
>>>
>> --
>>
>>
>>
>
>
>
> --
> Thanks and Regards:
> Rahul Kumar Patle
> M.Tech, School of Information Technology
> Indian Institute of Technology, Kharagpur-721302,
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--
Thanks and Regards:
Rahul Kumar Patle
M.Tech, School of Information Technology
Indian Institute of Technology, Kharagpur-721302,
India<http://www.iitkgp.ac.in/>
Mobile No: +91-8798049298, +91-9424738542
Alternate Email: rahulkumarpa...@hotmail.com
[image: Linkedin]<http://www.linkedin.com/profile/view?id=106245716&trk=tab_pro>
[image: Twitter] <https://twitter.com/rahulkumarpatle>
<https://www.facebook.com/rkpatle>
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