Nice one @Dave On Sun, Aug 28, 2011 at 6:29 PM, Dave <dave_and_da...@juno.com> wrote:
> @Nikhil: See http://groups.google.com/group/algogeeks/msg/2a9e07ee8ab71366 > > Dave > > On Aug 28, 3:56 am, Nikhil Gupta <nikhilgupta2...@gmail.com> wrote: > > Here is a small piece of program which counts the number of bits set in a > > number. I found it online somewhere. > > InputOutput00(0000000)52(0000101)73(0000111) > > > > *int* CountBits (*unsigned* *int* x ) > > { > > *static* *unsigned* *int* mask[] *=* { 0x55555555, > > 0x33333333, > > 0x0F0F0F0F, > > 0x00FF00FF, > > 0x0000FFFF } ; > > *int* i ; > > *int* shift ; /* Number of positions to shift to right*/ > > *for* ( i *=*0, shift *=*1; i *<* 5; i *++*, shift **=* 2) > > x *=* (x *&* mask[i ])*+* ( ( x *>>* shift) *&* > mask[i]); > > *return* x; > > } > > > > Can anyone explain how this is working? > > > > -- > > Nikhil Gupta > > Senior Co-ordinator, Publicity > > CSI, NSIT Students' Branch > > NSIT, New Delhi, India > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to algogeeks@googlegroups.com. > To unsubscribe from this group, send email to > algogeeks+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
