Bug #73732 [Opn->Nab]: Sprintf bug for 1.15*100*2^n values

Edit report at https://bugs.php.net/bug.php?id=73732&edit=1 ID: 73732 Updated by: requinix@php.net Reported by: teodor dot danciu at gmail dot com Summary: Sprintf bug for 1.15*100*2^n values -Status: Open +Status: Not a bug Type: Bug Package: Strings related Operating System: Irrelevant PHP Version: Irrelevant Block user comment: N Private report: N New Comment: Floating point values have a limited precision. Hence a value might not have the same string representation after any processing. That also includes writing a floating point value in your script and directly printing it without any mathematical operations. If you would like to know more about "floats" and what IEEE 754 is, read this: http://www.floating-point-gui.de/ Thank you for your interest in PHP. Previous Comments: ------------------------------------------------------------------------ [2016-12-13 10:25:01] teodor dot danciu at gmail dot com Description: ------------ sprintf("%03d ",(1.15*100)); and values multiplied by 2 return wrong values ex 114 instead of 115 Test script: --------------- $price=1.15*100; echo sprintf("%03d ",$price); // prints 114 instead of 115 $price=1.15*100*2; echo sprintf("%03d ",$price); // prints 229 instead of 230 $price=1.15*100*4; echo sprintf("%03d ",$price); // prints 459 instead of 460 $price=1.15*100*8; echo sprintf("%03d ",$price); // prints 919 instead of 920 $price=1.15*100*10; echo sprintf("%03d ",$price); // prints 1149 instead of 1150 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=73732&edit=1