How can I get the correct floating point calculations [duplicate]

How can I get the correct floating point calculations [duplicate]

References

Reference NO 1

http://stackoverflow.com/questions/11366522/php-floating-point-errors-with-basic-maths

Reference NO 2

http://stackoverflow.com/questions/14251052/while-3-0-1-cannot-be-represented-exactly-why-can-javascript-properly-calcula

Reference NO 3

http://support.microsoft.com/kb/214118

Reference NO 4

http://www.imagemagick.org/Usage/basics/

Reference NO 5

http://unix.stackexchange.com/questions/42010/re-assigning-specifically-incrementing-a-variable-in-a-bash-script

Reference NO 6

http://stat.ethz.ch/R-manual/R-devel/library/base/html/duplicated.html

Reference NO 7

http://h71000.www7.hp.com/doc/82final/5433/5433pro_027.html

Reference NO 8

http://www.duplicate-file-detective.com/download/ReleaseNotes.htm