yeah..dat we all know..bt wat actually this code is doing..this is wat am thinking!!!
On Sun, Aug 28, 2011 at 2:12 AM, Debabrata Das < [email protected]> wrote: > Another approach!! > > while(x) > { > x=x&(x-1); > count++; > > } > > On Sun, Aug 28, 2011 at 2:26 PM, Nikhil Gupta > <[email protected]>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 [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> 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 [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > -- *Dheeraj Sharma* Comp Engg. NIT Kurukshetra +91 8950264227 -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
