PHP 4.0 Bug #10002 Updated: sprintf() and floating point

ID: 10002 Updated by: zeev Reported By: bmr@comtime.com Status: Open Bug Type: Strings related Assigned To: Comments: I can't reproduce it under RH 6.2. Generally the fix isn't supposed to do anything (since arg is a double, 10 should be converted to a double automatically), but the fix can't hurt anything so if it works around a compiler bug, it's fine. PHP cannot use sprintf() because sprintf() works with C types with predefined types for the arguments, whether PHP has its own types, and autoconverts arguments to match the format string. Previous Comments: --------------------------------------------------------------------------- [2001-03-26 17:19:30] derick@php.net This bug is in 4.0.5RC2 too, just confirmed it --------------------------------------------------------------------------- [2001-03-26 14:13:27] bmr@comtime.com <?php printf('%.2f',0.09999999999999999167332731531132594682276248931884765625); ?> produces '0.0:' instead of '0.10' I'm really curious as to why PHP just doesn't use libc's sprintf(). ./configure --with-oracle=/usr/local/oracle/product/8.1.7 --with-oci8=/usr/local/oracle/product/8.1.7 --enable-force-cgi-redirect --enable-track-vars --with-posix --enable-sockets --enable-sigchild --with-gd=/usr/local gcc version 2.95.2 19991024 (release) This is not exactly a fix... --- ext/standard/formatted_print.c Mon Mar 26 14:01:31 2001 +++ ext/standard/formatted_print.c-fixed Mon Mar 26 14:02:26 2001 @@ -92,7 +92,7 @@ while (p1 < &cvt_buf[NDIG]) *p++ = *p1++; } else if (arg > 0) { - while ((fj = arg * 10) < 1) { + while ((fj = arg * 10.0) < 0.9999999) { arg = fj; r2--; } --------------------------------------------------------------------------- ATTENTION! Do NOT reply to this email! To reply, use the web interface found at http://bugs.php.net/?id=10002&edit=2