How to get amount of 1s from 64 bit number [duplicate]

How to get amount of 1s from 64 bit number [duplicate]

References

Reference NO 1

http://stackoverflow.com/questions/15185324/how-to-get-amount-of-1s-from-64-bit-number

Reference NO 2

http://stackoverflow.com/questions/1532819/algorithm-efficient-way-to-remove-duplicate-integers-from-an-array

Reference NO 3

http://mtatar.wordpress.com/2013/02/26/how-would-you-quickly-detect-duplicates-in-an-array-of-10-million-random-64-bit-integers/

Reference NO 4

http://download.cnet.com/Duplicate-File-Finder/3000-2248_4-10300084.html

Reference NO 5

http://perldoc.perl.org/perlfaq4.html

Reference NO 6

http://www.fas.harvard.edu/~libcs124/CS/lec12.pdf

Reference NO 7

http://www.ablebits.com/excel-remove-duplicates/index.php

Reference NO 8

http://discuss.joelonsoftware.com/default.asp?interview.11.578648.14