On Thu, Aug 25, 2011 at 7:58 PM, amit kannaujiya <
[email protected]> wrote:
> int reverse(int n)
> {
> int i=9*( abs(n/10 - n%10) );
> i=i+n;
> return i;
> }
>
> On Wed, Aug 24, 2011 at 9:56 PM, Dave <[email protected]> wrote:
>
>> @Anika: So you want to reverse the digits of the decimal
>> representation of a number. Extracting decimal digits requires
>> division and modulus by 10. Normally this is done by division, but as
>> a different recent thread has shown, division can be accomplished by
>> bit operations, comparisons, and subtraction.
>>
>> This is the kind of computation you should go through to reverse the
>> decimal digits of a number...
>>
>> int reverse( int n );
>> {
>> int i = 0;
>> while( n )
>> {
>> i = i * 10 + n % 10;
>> n /= 10;
>> }
>> return i;
>> }
>>
>> Now, if you want, you can dig though the other postings for the
>> division algorithm. A simple modification of that algorithm can return
>> the modulus (remainder) instead of or in addition to the quotient.
>> Multiplication by 10 can be done with bit operations as i << 3 + i <<
>> 1.
>>
>> Dave
>>
>> On Aug 11, 12:57 pm, Anika Jain <[email protected]> wrote:
>> > reverse of a no. means.. reverse of 39 is 93..
>> > but i dont get it how can we reverse a no. by bitwise operator...
>> >
>> >
>> >
>> > On Thu, Aug 11, 2011 at 11:11 PM, manvir siyo <[email protected]>
>> wrote:
>> > > please tell me abt the pattern of de shaw company..
>> > > please
>> >
>> > > On Thu, Aug 11, 2011 at 11:06 PM, paul suganthan <
>> [email protected]
>> > > > wrote:
>> >
>> > >> You are trying to reverse the bits. not the number.
>> > >> This will not work for bits also!
>> >
>> > >> If given input is 1101 0011
>> > >> you will get
>> > >> 0010 1100
>> >
>> > >> On Thu, Aug 11, 2011 at 11:01 PM, Naren s <[email protected]>
>> wrote:
>> >
>> > >>> not 100% sure if this is what you are asking for but here it goes.
>> >
>> > >>> you have a number 11110000 (binary) and you want 00001111 (binary)?
>> >
>> > >>> you want to use the xor operator ^
>> >
>> > >>> value = 0xf0; //11110000 binary
>> > >>> printf("before %d\n");
>> > >>> value ^= 0xff; //11111111 binary
>> > >>> printf("after%d\n");
>> >
>> > >>> output:
>> > >>> before 240
>> > >>> after 15
>> >
>> > >>> 240 in binary is 11110000
>> > >>> 15 in binary is 00001111
>> >
>> > >>> <
>> http://wiki.answers.com/Q/How_do_you_reverse_a_number_using_bitwise_o...>
>> >
>> > >>> On Thu, Aug 11, 2011 at 10:43 PM, Rajeshwar Patra <
>> > >>> [email protected]> wrote:
>> >
>> > >>>> how can we reverse a number using bitwise operators?
>> >
>> > >>>> --
>> > >>>> *Rajeshwar Patra,*
>> > >>>> *MCA final year,*
>> > >>>> *Nit Durgapur*
>> >
>> > >>>> --
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>> > >>> --
>> > >>> *Narayanan S,*
>> > >>> B.E., C.S.E., (final year),
>> > >>> College Of Engineering Guindy,
>> > >>> Anna University,
>> > >>> Chennai-25.
>> >
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