#37202 [NEW]: Iterations with bad precision

From: ruben_ruben at yahoo dot com Operating system: win xp pro sp2 PHP version: 5.1.2 PHP Bug Type: Variables related Bug description: Iterations with bad precision Description: ------------ In loops like While and For with increases with point decimal fails the precision. Reproduce code: --------------- $i=71; $i2 = 82; $increases = .1; for($i; $i <= $i2; $i = $i + $increases) { echo "$i<br>"; } //**** or ****** $i=1.5; $i2 = 2; $increases = .001; while($i <= $i2) { echo "$i<br>"; $i = $i + $increases; } Expected result: ---------------- with $i=71; $i2 = 82; $increases = .1; it must be: 71 71.1 . . . 81.9 82 *************** with $i=1.5; $i2 = 2; $increases = .001; it must be: 1.5 1.501 1.502 . . . 1.999 2 Actual result: -------------- both with $i=71; $i2 = 82; generates: 71 71.1 . . 79.8 79.899999999999 79.999999999999 . . 81.899999999999 81.999999999999 *************** both with $i=1.5; $i2 = 2; $increases = .001; generates: 1.5 1.501 1.502 . . 1.954 1.9549999999999 1.9559999999999 . . 1.9989999999999 1.9999999999999 -- Edit bug report at http://bugs.php.net/?id=37202&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=37202&r=trysnapshot44 Try a CVS snapshot (PHP 5.1): http://bugs.php.net/fix.php?id=37202&r=trysnapshot51 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=37202&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=37202&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=37202&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=37202&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=37202&r=needscript Try newer version: http://bugs.php.net/fix.php?id=37202&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=37202&r=support Expected behavior: http://bugs.php.net/fix.php?id=37202&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=37202&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=37202&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=37202&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=37202&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=37202&r=dst IIS Stability: http://bugs.php.net/fix.php?id=37202&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=37202&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=37202&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=37202&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=37202&r=mysqlcfg