note 72962 added to function.floatval

hi.. im having problem with adding negative and positive numbers.. my numbers are in an array.. what i do is i add teo double type numbers.. sample: 9278.88 + -9278.88 and etc.. well, most of the sum of the two numbers are correct, but there are instances that the answer is wrong.. im sure i have the right number. but still 9278.88 + -9278.88 ives 1.818988787E-012 answer.. i dont understand.. i tried to identify if the numbers are numbers and it is. i tried is_numeric.. evrything is ok with the dat. i just dont understand why it gives an E-012 answer.. please help.. thanks a lot! ---- Server IP: 69.147.83.197 Probable Submitter: 203.177.1.114 (proxied: 192.168.109.43) ---- Manual Page -- http://www.php.net/manual/en/function.floatval.php Edit -- https://master.php.net/note/edit/72962 Del: integrated -- https://master.php.net/note/delete/72962/integrated Del: useless -- https://master.php.net/note/delete/72962/useless Del: bad code -- https://master.php.net/note/delete/72962/bad+code Del: spam -- https://master.php.net/note/delete/72962/spam Del: non-english -- https://master.php.net/note/delete/72962/non-english Del: in docs -- https://master.php.net/note/delete/72962/in+docs Del: other reasons-- https://master.php.net/note/delete/72962 Reject -- https://master.php.net/note/reject/72962 Search -- https://master.php.net/manage/user-notes.php