#30655 [Opn->Bgs]: mod bug with double

ID: 30655 Updated by: derick@php.net Reported By: shejan at web dot de -Status: Open +Status: Bogus Bug Type: *General Issues Operating System: Linux/Windows PHP Version: Irrelevant 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. Thank you for your interest in PHP. . Previous Comments: ------------------------------------------------------------------------ [2004-11-02 09:31:30] shejan at web dot de Description: ------------ mod (%) has problems with double. with 2.01*100 mod isnt working but 1.01*100 works fine. chaning a double to int isnt working. chaning a double to string and than int is working. Reproduce code: --------------- echo "201%100: ".(201%100)."<br>"; // 1 (that is right) echo "(2.01*100)%100: ".((2.01*100)%100)."<br>"; // 0 (wrong) echo "((int)(2.01*100))%100: ".(((int)(2.01*100))%100)."<br>"; // 0 (wrong) echo "((int)(string)(2.01*100))%100: ".(((int)(string)(2.01*100))%100)."<br>"; // 1 (right) Expected result: ---------------- 201%100: 1 (2.01*100)%100: 0 ((int)(2.01*100))%100: 0 ((int)(string)(2.01*100))%100: 1 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=30655&edit=1