Bug #54094 [Opn->Bgs]: Sprintf change integer with %d

Edit report at http://bugs.php.net/bug.php?id=54094&edit=1 ID: 54094 Updated by: rasmus@php.net Reported by: mallsbill at gmail dot com Summary: Sprintf change integer with %d -Status: Open +Status: Bogus Type: Bug Package: Strings related Operating System: Linux debian 2.6.26-2-686 PHP Version: 5.2.17 Block user comment: N Private report: N New Comment: Floating point math is not exact. 4.77 * 100 cannot be accurately represented so it ends up being 476.9999999999999999 and when you cast that to an integer the way you are doing you get 476. You can read more about it here: http://en.wikipedia.org/wiki/IEEE_754-2008 In your case add a round() to the appropriate precision on your floating point operation. Previous Comments: ------------------------------------------------------------------------ [2011-02-24 18:06:37] mallsbill at gmail dot com Description: ------------ --- From manual page: http://www.php.net/function.sprintf#Description --- with some integer obtain after an operation from a float, sprintf('%d', $val) return a different value Test script: --------------- $var1 = 4.77*100; echo $var2 = sprintf("%d", $var1); Expected result: ---------------- should return 477 Actual result: -------------- return 476 works when cast in string $var1 = 4.77*100; echo $var2 = sprintf("%d", (string)$var1); ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=54094&edit=1